puppeteer/third_party/phantomjs/examples/unrandomize.js

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// Modify global object at the page initialization.
// In this example, effectively Math.random() always returns 0.42.
"use strict";
var page = require('webpage').create();
page.onInitialized = function () {
page.evaluate(function () {
Math.random = function() {
return 42 / 100;
};
});
};
page.open('http://ariya.github.com/js/random/', function (status) {
var result;
if (status !== 'success') {
console.log('Network error.');
} else {
console.log(page.evaluate(function () {
return document.getElementById('numbers').textContent;
}));
}
phantom.exit();
});