用casper.evaluate声明变量
用casper.evaluate声明变量
提问于 2014-05-23 01:40:09
在下面的示例中，我试图在evaluate中声明一个名为foo的全局变量。然后使用网页上的脚本输出它。但是，错误消息表示未定义变量。
网页: index.html
<html>
<head>
<meta charser="utf-8">
<title> Page title </title>
</head>
<body>
<script>
window.onload = function() {
console.log('started webpage script');
console.log(foo);
};
</script>
</body>
</html>Casper脚本: casper.js
var casper = require('casper').create({
verbose : true,
logLevel : "debug"
});
casper.start('http://localhost:8080');
casper.on('page.error', function(err) {
this.echo(err, 'ERROR');
});
casper.on('remote.message', function(msg) {
this.echo(msg);
});
casper.on('run.start', function() {
casper.evaluate(function() {
console.log('Running evaluate script');
window.foo = "Hello world!";
});
});
casper.run();终端输出
[info] [phantom] Starting...
[info] [phantom] Running suite: 2 steps
[debug] [phantom] Successfully injected Casper client-side utilities
Running evaluate script
[debug] [phantom] opening url: http://localhost:8080/, HTTP GET
[debug] [phantom] Navigation requested: url=http://localhost:8080/, type=Other, willNavigate=true, isMainFrame=true
[debug] [phantom] url changed to "http://localhost:8080/"
started webpage script
ReferenceError: Can't find variable: foo
[debug] [phantom] Successfully injected Casper client-side utilities
[debug] [phantom] start page is loaded
[info] [phantom] Done 2 steps in 65ms回答 1
Stack Overflow用户
回答已采纳
发布于 2014-05-24 13:50:55
我需要在casper.evaluate()上调用page.initialize
casper.on('page.initialize', function() {
casper.evaluate(function() {
console.log('Running evaluate script');
window.foo = "Hello world!";
});
});页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/23819747
复制相关文章
相似问题
腾讯云开发者
Copyright © 2013 - 2026 Tencent Cloud. All Rights Reserved. 腾讯云 版权所有
深圳市腾讯计算机系统有限公司 ICP备案/许可证号：粤B2-20090059 
粤公网安备44030502008569号
腾讯云计算（北京）有限责任公司 京ICP证150476号 | 京ICP备11018762号