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< title data-rh = "true" > JavaScript execution | Puppeteer< / title > < meta data-rh = "true" name = "viewport" content = "width=device-width,initial-scale=1" > < meta data-rh = "true" name = "twitter:card" content = "summary_large_image" > < meta data-rh = "true" property = "og:url" content = "https://pptr.dev/guides/javascript-execution" > < meta data-rh = "true" property = "og:locale" content = "en" > < meta data-rh = "true" name = "docsearch:language" content = "en" > < meta data-rh = "true" name = "docsearch:counter" content = "2" > < meta data-rh = "true" property = "og:title" content = "JavaScript execution | Puppeteer" > < meta data-rh = "true" name = "description" content = "Puppeteer allows evaluating JavaScript functions in the context of the page" > < meta data-rh = "true" property = "og:description" content = "Puppeteer allows evaluating JavaScript functions in the context of the page" > < link data-rh = "true" rel = "icon" href = "/img/favicon.ico" > < link data-rh = "true" rel = "canonical" href = "https://pptr.dev/guides/javascript-execution" > < link data-rh = "true" rel = "alternate" href = "https://pptr.dev/guides/javascript-execution" hreflang = "en" > < link data-rh = "true" rel = "alternate" href = "https://pptr.dev/guides/javascript-execution" hreflang = "x-default" > < link data-rh = "true" rel = "preconnect" href = "https://DVKY664LG7-dsn.algolia.net" crossorigin = "anonymous" > < link rel = "search" type = "application/opensearchdescription+xml" title = "Puppeteer" href = "/opensearch.xml" >
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< script > ! function ( ) { function t ( t ) { document . documentElement . setAttribute ( "data-theme" , t ) } var e = function ( ) { try { return new URLSearchParams ( window . location . search ) . get ( "docusaurus-theme" ) } catch ( t ) { } } ( ) || function ( ) { try { return localStorage . getItem ( "theme" ) } catch ( t ) { } } ( ) ; t ( null !== e ? e : "light" ) } ( ) , function ( ) { try { const c = new URLSearchParams ( window . location . search ) . entries ( ) ; for ( var [ t , e ] of c ) if ( t . startsWith ( "docusaurus-data-" ) ) { var a = t . replace ( "docusaurus-data-" , "data-" ) ; document . documentElement . setAttribute ( a , e ) } } catch ( t ) { } } ( ) < / script > < div id = "__docusaurus" > < div role = "region" aria-label = "Skip to main content" > < a class = "skipToContent_fXgn" href = "#__docusaurus_skipToContent_fallback" > Skip to main content< / a > < / div > < nav aria-label = "Main" class = "navbar navbar--fixed-top" > < div class = "navbar__inner" > < div class = "navbar__items" > < button aria-label = "Toggle navigation bar" aria-expanded = "false" class = "navbar__toggle clean-btn" type = "button" > < svg width = "30" height = "30" viewBox = "0 0 30 30" aria-hidden = "true" > < path stroke = "currentColor" stroke-linecap = "round" stroke-miterlimit = "10" stroke-width = "2" d = "M4 7h22M4 15h22M4 23h22" > < / path > < / svg > < / button > < a class = "navbar__brand" href = "/" > < div class = "navbar__logo" > < img src = "https://user-images.githubusercontent.com/10379601/29446482-04f7036a-841f-11e7-9872-91d1fc2ea683.png" alt = "Puppeteer Logo" class = "themedComponent_mlkZ themedComponent--light_NVdE" > < img src = "https://user-images.githubusercontent.com/10379601/29446482-04f7036a-841f-11e7-9872-91d1fc2ea683.png" alt = "Puppeteer Logo" class = "themedComponent_mlkZ themedComponent--dark_xIcU" > < / div > < b class = "navbar__title text--truncate" > Puppeteer< / b > < / a > < a aria-current = "page" class = "navbar__item navbar__link navbar__link--active" href = "/category/introduction" > Docs< / a > < a class = "navbar__item navbar__link" href = "/api/puppeteer.puppeteernode" > Puppeteer API< / a > < a class = "navbar__item navbar__link" href = "/browsers-api/" > @puppeteer/browsers API< / a > < / div > < div class = "navbar__items navbar__items--right" > < div class = "navbar__item dropdown dropdown--hoverable dropdown--right" > < a class = "navbar__link" aria-haspopup = "true" aria-expanded = "false" role = "button" href = "/" > 22.6.4< / a > < ul class = "dropdown__menu" > < li > < a class = "dropdown__link" href = "/next/guides/javascript-execution" > Next< / a > < / li > < li > < a aria-current = "page" class = "dropdown__link dropdown__link--active" href = "/guides/javascript-execution" > 22.6.4< / a > < / li > < li > < hr class = "dropdown-separator" > < / li > < li class = "dropdown-archived-versions" > < b > Archived versions< / b > < / li > < li > < a href = "https://github.com/puppeteer/puppeteer/blob/puppeteer-v22.6.3/docs/api/index.md" target = "_blank" rel = "noopener noreferrer" class = "dropdown__link" > 22.6.3< svg width = "12" height = "12" aria-hidden = "true" viewBox = "0 0 24 24" class = "iconExternalLink_nPIU" > < path fill = "currentColor" d = "M21 13v10h-21v-19h12v2h-10v15h17v-8h2zm3-12h-10.988l4.035 4-6.977 7.07 2.828 2.828 6.977-7.07 4.125 4.172v-11z" > < / path > < / svg > < / a > < / li > < li > < a href = "https://github.com/puppeteer/puppeteer/blob/puppeteer-v22.6.2/docs/api/index.md" target = "_blank" rel = "noopener noreferrer" class = "dropdown__link" > 22.6.2< svg width = "12" height = "12" aria-hidden = "true" viewBox = "0 0 24 24" class = "iconExternalLink_nPIU" > < path fill = "currentColor" d = "M21 13v10h-21v-19h12v2h-10v15h17v-8h2zm3-12h-10.988l4.035 4-6.977 7.07 2.828 2.828 6.977-7.07 4.125 4.172v-11z" > < / path > < / svg > < / a > < / li > < li > < a href = "https://github.com/puppeteer/puppeteer/blob/puppeteer-v22.6.1/docs/api/index.md" target = "_blank" rel = "noopener noreferrer" class = "dropdown__link" > 22.6.1< svg width = "12" height = "12" aria-hidden = "true" viewBox = "0 0 24 24" class = "iconExternalLink_nPIU" > < path fill = "currentColor" d = "M21 13v10h-21v-19h12v2h-10v15h17v-8h2zm3-12h-10.988l4.035 4-6.977 7.07 2.828 2.828 6.977-7.07 4.125 4.172v-11z" > < / path > < / svg > < / a > < / li > < li > < a href = "https://github.com/puppeteer/puppeteer/blob/puppeteer-v22.6.0/docs/api/index.md" target = "_blank" rel = "noopener noreferrer" class = "dropdown__link" > 22.6.0< svg width = "12" height = "12" aria-hidden = "true" viewBox = "0 0 24 24" class = "iconExternalLink_nPIU" > < path fill = "currentColor" d = "M21 13v10h-21v-19h12v2h-10
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< p > Puppeteer allows evaluating JavaScript functions in the context of the page
driven by Puppeteer:< / p >
< div class = "language-ts codeBlockContainer_Ckt0 theme-code-block" style = "--prism-color:#393A34;--prism-background-color:#f6f8fa" > < div class = "codeBlockContent_biex" > < pre tabindex = "0" class = "prism-code language-ts codeBlock_bY9V thin-scrollbar" style = "color:#393A34;background-color:#f6f8fa" > < code class = "codeBlockLines_e6Vv" > < span class = "token-line" style = "color:#393A34" > < span class = "token comment" style = "color:#999988;font-style:italic" > // Import puppeteer< / span > < span class = "token plain" > < / span > < br > < / span > < span class = "token-line" style = "color:#393A34" > < span class = "token plain" > < / span > < span class = "token keyword" style = "color:#00009f" > import< / span > < span class = "token plain" > puppeteer < / span > < span class = "token keyword" style = "color:#00009f" > from< / span > < span class = "token plain" > < / span > < span class = "token string" style = "color:#e3116c" > ' puppeteer' < / span > < span class = "token punctuation" style = "color:#393A34" > ;< / span > < span class = "token plain" > < / span > < br > < / span > < span class = "token-line" style = "color:#393A34" > < span class = "token plain" style = "display:inline-block" > < / span > < br > < / span > < span class = "token-line" style = "color:#393A34" > < span class = "token plain" > < / span > < span class = "token punctuation" style = "color:#393A34" > (< / span > < span class = "token keyword" style = "color:#00009f" > async< / span > < span class = "token plain" > < / span > < span class = "token punctuation" style = "color:#393A34" > (< / span > < span class = "token punctuation" style = "color:#393A34" > )< / span > < span class = "token plain" > < / span > < span class = "token operator" style = "color:#393A34" > => < / span > < span class = "token plain" > < / span > < span class = "token punctuation" style = "color:#393A34" > {< / span > < span class = "token plain" > < / span > < br > < / span > < span class = "token-line" style = "color:#393A34" > < span class = "token plain" > < / span > < span class = "token comment" style = "color:#999988;font-style:italic" > // Launch the browser< / span > < span class = "token plain" > < / span > < br > < / span > < span class = "token-line" style = "color:#393A34" > < span class = "token plain" > < / span > < span class = "token keyword" style = "color:#00009f" > const< / span > < span class = "token plain" > browser < / span > < span class = "token operator" style = "color:#393A34" > =< / span > < span class = "token plain" > < / span > < span class = "token keyword" style = "color:#00009f" > await< / span > < span class = "token plain" > puppeteer< / span > < span class = "token punctuation" style = "color:#393A34" > .< / span > < span class = "token function" style = "color:#d73a49" > launch< / span > < span class = "token punctuation" style = "color:#393A34" > (< / span > < span class = "token punctuation" style = "color:#393A34" > )< / span > < span class = "token punctuation" style = "color:#393A34" > ;< / span > < span class = "token plain" > < / span > < br > < / span > < span class = "token-line" style = "color:#393A34" > < span class = "token plain" style = "display:inline-block" > < / span > < br > < / span > < span class = "token-line" style = "color:#393A34" > < span class = "token plain" > < / span > < span class = "token comment" style = "color:#999988;font-style:italic" > // Create a page< / span > < span class = "token plain" > < / span > < br > < / span > < span class = "token-line" style = "color:#393A34" > < span class = "token plain" > < / span > < span class = "token keyword" style = "color:#00009f" > const< / span > < span class = "token plain" > page < / span > < span class = "token operator" style = "color:#393A34" > =< / span > < span class = "token plain" > < / span > < span class = "token keyword" style = "color:#00009f" > await< / span > < span class = "token plain" > browser< / span > < span class = "token punctuation" style = "color:#393A34" > .< / span > < span class = "token function" style = "color:#d73a49" > newPage< / span > < span class = "token punctuation" style = "color:#393A34" > (< / span > < span class = "token punctuation" style = "color:#393A34" > )< / span > < span class = "token punctuation" style = "color:#393A34" > ;< / span > < span class = "token plain" > < / span > < br > < / span > < span class = "token-line" style = "color:#393A34" > < span class = "token plain" style = "display:inline-block" > < / span > < br > < / span > < span class = "token-line" style = "color:#393A34" > < span class = "token plain" > < / span > < span class = "token comment" style = "color:#999988;font-style:italic" > // Go to your site< / span > < span class = "token plain" > < / span > < br > < / span > < span class = "token-line" sty
< div class = "theme-admonition theme-admonition-caution admonition_xJq3 alert alert--warning" > < div class = "admonitionHeading_Gvgb" > < span class = "admonitionIcon_Rf37" > < svg viewBox = "0 0 16 16" > < path fill-rule = "evenodd" d = "M8.893 1.5c-.183-.31-.52-.5-.887-.5s-.703.19-.886.5L.138 13.499a.98.98 0 0 0 0 1.001c.193.31.53.501.886.501h13.964c.367 0 .704-.19.877-.5a1.03 1.03 0 0 0 .01-1.002L8.893 1.5zm.133 11.497H6.987v-2.003h2.039v2.003zm0-3.004H6.987V5.987h2.039v4.006z" > < / path > < / svg > < / span > caution< / div > < div class = "admonitionContent_BuS1" > < p > Although the function is defined in your script context, it actually gets
stringified by Puppeteer, sent to the target page over Chrome DevTools protocol
and evaluated there. It means that the function cannot access scope variables in
your script.< / p > < / div > < / div >
< p > Alternatively, you can provide a function body as a string:< / p >
< div class = "language-ts codeBlockContainer_Ckt0 theme-code-block" style = "--prism-color:#393A34;--prism-background-color:#f6f8fa" > < div class = "codeBlockContent_biex" > < pre tabindex = "0" class = "prism-code language-ts codeBlock_bY9V thin-scrollbar" style = "color:#393A34;background-color:#f6f8fa" > < code class = "codeBlockLines_e6Vv" > < span class = "token-line" style = "color:#393A34" > < span class = "token comment" style = "color:#999988;font-style:italic" > // Evaluate JavaScript< / span > < span class = "token plain" > < / span > < br > < / span > < span class = "token-line" style = "color:#393A34" > < span class = "token plain" > < / span > < span class = "token keyword" style = "color:#00009f" > const< / span > < span class = "token plain" > three < / span > < span class = "token operator" style = "color:#393A34" > =< / span > < span class = "token plain" > < / span > < span class = "token keyword" style = "color:#00009f" > await< / span > < span class = "token plain" > page< / span > < span class = "token punctuation" style = "color:#393A34" > .< / span > < span class = "token function" style = "color:#d73a49" > evaluate< / span > < span class = "token punctuation" style = "color:#393A34" > (< / span > < span class = "token template-string template-punctuation string" style = "color:#e3116c" > `< / span > < span class = "token template-string string" style = "color:#e3116c" > < / span > < br > < / span > < span class = "token-line" style = "color:#393A34" > < span class = "token template-string string" style = "color:#e3116c" > 1 + 2< / span > < br > < / span > < span class = "token-line" style = "color:#393A34" > < span class = "token template-string string" style = "color:#e3116c" > < / span > < span class = "token template-string template-punctuation string" style = "color:#e3116c" > `< / span > < span class = "token punctuation" style = "color:#393A34" > )< / span > < span class = "token punctuation" style = "color:#393A34" > ;< / span > < br > < / span > < / code > < / pre > < div class = "buttonGroup__atx" > < button type = "button" aria-label = "Copy code to clipboard" title = "Copy" class = "clean-btn" > < span class = "copyButtonIcons_eSgA" aria-hidden = "true" > < svg viewBox = "0 0 24 24" class = "copyButtonIcon_y97N" > < path fill = "currentColor" d = "M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z" > < / path > < / svg > < svg viewBox = "0 0 24 24" class = "copyButtonSuccessIcon_LjdS" > < path fill = "currentColor" d = "M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z" > < / path > < / svg > < / span > < / button > < / div > < / div > < / div >
< div class = "theme-admonition theme-admonition-caution admonition_xJq3 alert alert--warning" > < div class = "admonitionHeading_Gvgb" > < span class = "admonitionIcon_Rf37" > < svg viewBox = "0 0 16 16" > < path fill-rule = "evenodd" d = "M8.893 1.5c-.183-.31-.52-.5-.887-.5s-.703.19-.886.5L.138 13.499a.98.98 0 0 0 0 1.001c.193.31.53.501.886.501h13.964c.367 0 .704-.19.877-.5a1.03 1.03 0 0 0 .01-1.002L8.893 1.5zm.133 11.497H6.987v-2.003h2.039v2.003zm0-3.004H6.987V5.987h2.039v4.006z" > < / path > < / svg > < / span > caution< / div > < div class = "admonitionContent_BuS1" > < p > The example above produces the equivalent results but it also illustrates that
the types and global variables available to the evaluated function cannot be
known. Especially, in TypeScript you should be careful to make sure that objects
referenced by the evaluated function are correct.< / p > < / div > < / div >
< h2 class = "anchor anchorWithStickyNavbar_LWe7" id = "return-types" > Return types< a href = "#return-types" class = "hash-link" aria-label = "Direct link to Return types" title = "Direct link to Return types" > < / a > < / h2 >
< p > The functions you evaluate can return values. If the returned value is of a
primitive type, it gets automatically converted by Puppeteer to a primitive type
in the script context like in the previous example.< / p >
< p > If the script returns an object, Puppeteer serializes it to a JSON and reconstructs it on the script side. This process might not always yield correct results, for example, when you return a DOM node:< / p >
< div class = "language-ts codeBlockContainer_Ckt0 theme-code-block" style = "--prism-color:#393A34;--prism-background-color:#f6f8fa" > < div class = "codeBlockContent_biex" > < pre tabindex = "0" class = "prism-code language-ts codeBlock_bY9V thin-scrollbar" style = "color:#393A34;background-color:#f6f8fa" > < code class = "codeBlockLines_e6Vv" > < span class = "token-line" style = "color:#393A34" > < span class = "token keyword" style = "color:#00009f" > const< / span > < span class = "token plain" > body < / span > < span class = "token operator" style = "color:#393A34" > =< / span > < span class = "token plain" > < / span > < span class = "token keyword" style = "color:#00009f" > await< / span > < span class = "token plain" > page< / span > < span class = "token punctuation" style = "color:#393A34" > .< / span > < span class = "token function" style = "color:#d73a49" > evaluate< / span > < span class = "token punctuation" style = "color:#393A34" > (< / span > < span class = "token punctuation" style = "color:#393A34" > (< / span > < span class = "token punctuation" style = "color:#393A34" > )< / span > < span class = "token plain" > < / span > < span class = "token operator" style = "color:#393A34" > => < / span > < span class = "token plain" > < / span > < span class = "token punctuation" style = "color:#393A34" > {< / span > < span class = "token plain" > < / span > < br > < / span > < span class = "token-line" style = "color:#393A34" > < span class = "token plain" > < / span > < span class = "token keyword" style = "color:#00009f" > return< / span > < span class = "token plain" > document< / span > < span class = "token punctuation" style = "color:#393A34" > .< / span > < span class = "token plain" > body< / span > < span class = "token punctuation" style = "color:#393A34" > ;< / span > < span class = "token plain" > < / span > < br > < / span > < span class = "token-line" style = "color:#393A34" > < span class = "token plain" > < / span > < span class = "token punctuation" style = "color:#393A34" > }< / span > < span class = "token punctuation" style = "color:#393A34" > )< / span > < span class = "token punctuation" style = "color:#393A34" > ;< / span > < span class = "token plain" > < / span > < br > < / span > < span class = "token-line" style = "color:#393A34" > < span class = "token plain" > < / span > < span class = "token builtin" > console< / span > < span class = "token punctuation" style = "color:#393A34" > .< / span > < span class = "token function" style = "color:#d73a49" > log< / span > < span class = "token punctuation" style = "color:#393A34" > (< / span > < span class = "token plain" > body< / span > < span class = "token punctuation" style = "color:#393A34" > )< / span > < span class = "token punctuation" style = "color:#393A34" > ;< / span > < span class = "token plain" > < / span > < span class = "token comment" style = "color:#999988;font-style:italic" > // {}, unexpected!< / span > < br > < / span > < / code > < / pre > < div class = "buttonGroup__atx" > < button type = "button" aria-label = "Copy code to clipboard" title = "Copy" class = "clean-btn" > < span class = "copyButtonIcons_eSgA" aria-hidden = "true" > < svg viewBox = "0 0 24 24" class = "copyButtonIcon_y97N" > < path fill = "currentColor" d = "M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z" > < / path > < / svg > < svg viewBox = "0 0 24 24" class = "copyButtonSuccessIcon_LjdS" > < path fill = "currentColor" d = "M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z" > < / path > < / svg > < / span > < / button > < / div > < / div > < / div >
< p > To work with the returned objects, Puppeteer offers a way to return objects by reference:< / p >
< div class = "language-ts codeBlockContainer_Ckt0 theme-code-block" style = "--prism-color:#393A34;--prism-background-color:#f6f8fa" > < div class = "codeBlockContent_biex" > < pre tabindex = "0" class = "prism-code language-ts codeBlock_bY9V thin-scrollbar" style = "color:#393A34;background-color:#f6f8fa" > < code class = "codeBlockLines_e6Vv" > < span class = "token-line" style = "color:#393A34" > < span class = "token keyword" style = "color:#00009f" > const< / span > < span class = "token plain" > body < / span > < span class = "token operator" style = "color:#393A34" > =< / span > < span class = "token plain" > < / span > < span class = "token keyword" style = "color:#00009f" > await< / span > < span class = "token plain" > page< / span > < span class = "token punctuation" style = "color:#393A34" > .< / span > < span class = "token function" style = "color:#d73a49" > evaluateHandle< / span > < span class = "token punctuation" style = "color:#393A34" > (< / span > < span class = "token punctuation" style = "color:#393A34" > (< / span > < span class = "token punctuation" style = "color:#393A34" > )< / span > < span class = "token plain" > < / span > < span class = "token operator" style = "color:#393A34" > => < / span > < span class = "token plain" > < / span > < span class = "token punctuation" style = "color:#393A34" > {< / span > < span class = "token plain" > < / span > < br > < / span > < span class = "token-line" style = "color:#393A34" > < span class = "token plain" > < / span > < span class = "token keyword" style = "color:#00009f" > return< / span > < span class = "token plain" > document< / span > < span class = "token punctuation" style = "color:#393A34" > .< / span > < span class = "token plain" > body< / span > < span class = "token punctuation" style = "color:#393A34" > ;< / span > < span class = "token plain" > < / span > < br > < / span > < span class = "token-line" style = "color:#393A34" > < span class = "token plain" > < / span > < span class = "token punctuation" style = "color:#393A34" > }< / span > < span class = "token punctuation" style = "color:#393A34" > )< / span > < span class = "token punctuation" style = "color:#393A34" > ;< / span > < span class = "token plain" > < / span > < br > < / span > < span class = "token-line" style = "color:#393A34" > < span class = "token plain" > < / span > < span class = "token builtin" > console< / span > < span class = "token punctuation" style = "color:#393A34" > .< / span > < span class = "token function" style = "color:#d73a49" > log< / span > < span class = "token punctuation" style = "color:#393A34" > (< / span > < span class = "token plain" > body < / span > < span class = "token keyword" style = "color:#00009f" > instanceof< / span > < span class = "token plain" > < / span > < span class = "token class-name" > ElementHandle< / span > < span class = "token punctuation" style = "color:#393A34" > )< / span > < span class = "token punctuation" style = "color:#393A34" > ;< / span > < span class = "token plain" > < / span > < span class = "token comment" style = "color:#999988;font-style:italic" > // true< / span > < br > < / span > < / code > < / pre > < div class = "buttonGroup__atx" > < button type = "button" aria-label = "Copy code to clipboard" title = "Copy" class = "clean-btn" > < span class = "copyButtonIcons_eSgA" aria-hidden = "true" > < svg viewBox = "0 0 24 24" class = "copyButtonIcon_y97N" > < path fill = "currentColor" d = "M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z" > < / path > < / svg > < svg viewBox = "0 0 24 24" class = "copyButtonSuccessIcon_LjdS" > < path fill = "currentColor" d = "M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z" > < / path > < / svg > < / span > < / button > < / div > < / div > < / div >
< p > The returned object is either a < code > JSHandle< / code > or a < code > ElementHandle< / code > . < code > ElementHandle< / code > extends < code > JSHandle< / code > and it is only created for DOM elements.< / p >
< p > See the < a href = "https://pptr.dev/api" target = "_blank" rel = "noopener noreferrer" > API documentation< / a > for more details about what methods are available for handles.< / p >
< h2 class = "anchor anchorWithStickyNavbar_LWe7" id = "passing-arguments-to-the-evaluate-function" > Passing arguments to the evaluate function< a href = "#passing-arguments-to-the-evaluate-function" class = "hash-link" aria-label = "Direct link to Passing arguments to the evaluate function" title = "Direct link to Passing arguments to the evaluate function" > < / a > < / h2 >
< p > You can provide arguments to your function:< / p >
< div class = "language-ts codeBlockContainer_Ckt0 theme-code-block" style = "--prism-color:#393A34;--prism-background-color:#f6f8fa" > < div class = "codeBlockContent_biex" > < pre tabindex = "0" class = "prism-code language-ts codeBlock_bY9V thin-scrollbar" style = "color:#393A34;background-color:#f6f8fa" > < code class = "codeBlockLines_e6Vv" > < span class = "token-line" style = "color:#393A34" > < span class = "token keyword" style = "color:#00009f" > const< / span > < span class = "token plain" > three < / span > < span class = "token operator" style = "color:#393A34" > =< / span > < span class = "token plain" > < / span > < span class = "token keyword" style = "color:#00009f" > await< / span > < span class = "token plain" > page< / span > < span class = "token punctuation" style = "color:#393A34" > .< / span > < span class = "token function" style = "color:#d73a49" > evaluate< / span > < span class = "token punctuation" style = "color:#393A34" > (< / span > < span class = "token plain" > < / span > < br > < / span > < span class = "token-line" style = "color:#393A34" > < span class = "token plain" > < / span > < span class = "token punctuation" style = "color:#393A34" > (< / span > < span class = "token plain" > a< / span > < span class = "token punctuation" style = "color:#393A34" > ,< / span > < span class = "token plain" > b< / span > < span class = "token punctuation" style = "color:#393A34" > )< / span > < span class = "token plain" > < / span > < span class = "token operator" style = "color:#393A34" > => < / span > < span class = "token plain" > < / span > < span class = "token punctuation" style = "color:#393A34" > {< / span > < span class = "token plain" > < / span > < br > < / span > < span class = "token-line" style = "color:#393A34" > < span class = "token plain" > < / span > < span class = "token keyword" style = "color:#00009f" > return< / span > < span class = "token plain" > < / span > < span class = "token number" style = "color:#36acaa" > 1< / span > < span class = "token plain" > < / span > < span class = "token operator" style = "color:#393A34" > +< / span > < span class = "token plain" > < / span > < span class = "token number" style = "color:#36acaa" > 2< / span > < span class = "token punctuation" style = "color:#393A34" > ;< / span > < span class = "token plain" > < / span > < br > < / span > < span class = "token-line" style = "color:#393A34" > < span class = "token plain" > < / span > < span class = "token punctuation" style = "color:#393A34" > }< / span > < span class = "token punctuation" style = "color:#393A34" > ,< / span > < span class = "token plain" > < / span > < br > < / span > < span class = "token-line" style = "color:#393A34" > < span class = "token plain" > < / span > < span class = "token number" style = "color:#36acaa" > 1< / span > < span class = "token punctuation" style = "color:#393A34" > ,< / span > < span class = "token plain" > < / span > < br > < / span > < span class = "token-line" style = "color:#393A34" > < span class = "token plain" > < / span > < span class = "token number" style = "color:#36acaa" > 2< / span > < span class = "token plain" > < / span > < br > < / span > < span class = "token-line" style = "color:#393A34" > < span class = "token plain" > < / span > < span class = "token punctuation" style = "color:#393A34" > )< / span > < span class = "token punctuation" style = "color:#393A34" > ;< / span > < br > < / span > < / code > < / pre > < div class = "buttonGroup__atx" > < button type = "button" aria-label = "Copy code to clipboard" title = "Copy" class = "clean-btn" > < span class = "copyButtonIcons_eSgA" aria-hidden = "true" > < svg viewBox = "0 0 24 24" class = "copyButtonIcon_y97N" > < path fill = "currentColor" d = "M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z" > < / path > < / svg > < svg viewBox = "0 0 24 24" class = "copyButtonSuccessIcon_LjdS" > < path fill = "currentColor" d = "M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z" > < / path > < / svg > < / span > < / button > < / div > < / div > < / div >
< p > The arguments can be primitive values or < code > JSHandle< / code > s.< / p >
< div class = "theme-admonition theme-admonition-note admonition_xJq3 alert alert--secondary" > < div class = "admonitionHeading_Gvgb" > < span class = "admonitionIcon_Rf37" > < svg viewBox = "0 0 14 16" > < path fill-rule = "evenodd" d = "M6.3 5.69a.942.942 0 0 1-.28-.7c0-.28.09-.52.28-.7.19-.18.42-.28.7-.28.28 0 .52.09.7.28.18.19.28.42.28.7 0 .28-.09.52-.28.7a1 1 0 0 1-.7.3c-.28 0-.52-.11-.7-.3zM8 7.99c-.02-.25-.11-.48-.31-.69-.2-.19-.42-.3-.69-.31H6c-.27.02-.48.13-.69.31-.2.2-.3.44-.31.69h1v3c.02.27.11.5.31.69.2.2.42.31.69.31h1c.27 0 .48-.11.69-.31.2-.19.3-.42.31-.69H8V7.98v.01zM7 2.3c-3.14 0-5.7 2.54-5.7 5.68 0 3.14 2.56 5.7 5.7 5.7s5.7-2.55 5.7-5.7c0-3.15-2.56-5.69-5.7-5.69v.01zM7 .98c3.86 0 7 3.14 7 7s-3.14 7-7 7-7-3.12-7-7 3.14-7 7-7z" > < / path > < / svg > < / span > note< / div > < div class = "admonitionContent_BuS1" > < p > Page, JSHandle and ElementHandle offer several different helpers to evaluate JavaScript but they all follow the basic principles outlined in this guide.< / p > < / div > < / div > < / div > < / article > < nav class = "pagination-nav docusaurus-mt-lg" aria-label = "Docs pages" > < a class = "pagination-nav__link pagination-nav__link--prev" href = "/guides/page-interactions" > < div class = "pagination-nav__sublabel" > Previous< / div > < div class = "pagination-nav__label" > Page interactions< / div > < / a > < a class = "pagination-nav__link pagination-nav__link--next" href = "/guides/network-logging" > < div class = "pagination-nav__sublabel" > Next< / div > < div class = "pagination-nav__label" > Network logging< / div > < / a > < / nav > < / div > < / div > < div class = "col col--3" > < div class = "tableOfContents_bqdL thin-scrollbar theme-doc-toc-desktop" > < ul class = "table-of-contents table-of-contents__left-border" > < li > < a href = "#return-types" class = "table-of-contents__link toc-highlight" > Return types< / a > < / li > < li > < a href = "#passing-arguments-to-the-evaluate-function" class = "table-of-contents__link toc-highlight" > Passing arguments to the evaluate function< / a > < / li > < / ul > < / div > < / div > < / div > < / div > < / main > < / div > < / div > < / div > < footer class = "footer footer--dark" > < div class = "container container-fluid" > < div class = "row footer__links" > < div class = "col footer__col" > < div class = "footer__title" > Community< / div > < ul class = "footer__items clean-list" > < li class = "footer__item" > < a href = "https://stackoverflow.com/questions/tagged/puppeteer" target = "_blank" rel = "noopener noreferrer" class = "footer__link-item" > Stack Overflow< svg width = "13.5" height = "13.5" aria-hidden = "true" viewBox = "0 0 24 24" class = "iconExternalLink_nPIU" > < path fill = "currentColor" d = "M21 13v10h-21v-19h12v2h-10v15h17v-8h2zm3-12h-10.988l4.035 4-6.977 7.07 2.828 2.828 6.977-7.07 4.125 4.172v-11z" > < / path > < / svg > < / a > < / li > < li class = "footer__item" > < a href = "https://twitter.com/chromedevtools" target = "_blank" rel = "noopener noreferrer" class = "footer__link-item" > Twitter< svg width = "13.5" height = "13.5" aria-hidden = "true" viewBox = "0 0 24 24" class = "iconExternalLink_nPIU" > < path fill = "currentColor" d = "M21 13v10h-21v-19h12v2h-10v15h17v-8h2zm3-12h-10.988l4.035 4-6.977 7.07 2.828 2.828 6.977-7.07 4.125 4.172v-11z" > < / path > < / svg > < / a > < / li > < li class = "footer__item" > < a href = "https://goo.gle/devtools-youtube" target = "_blank" rel = "noopener noreferrer" class = "footer__link-item" > YouTube< svg width = "13.5" height = "13.5" aria-hidden = "true" viewBox = "0 0 24 24" class = "iconExternalLink_nPIU" > < path fill = "currentColor" d = "M21 13v10h-21v-19h12v2h-10v15h17v-8h2zm3-12h-10.988l4.035 4-6.977 7.07 2.828 2.828 6.977-7.07 4.125 4.172v-11z" > < / path > < / svg > < / a > < / li > < / ul > < / div > < / div > < div class = "footer__bottom text--center" > < div class = "footer__copyright" > Copyright © 2024 Google, Inc.< / div > < / div > < / div > < / footer > < / div >
2023-04-20 16:14:42 +00:00
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