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问题描述
我是CasperJS的新手。 this.echo(this.getTitle()); 如何工作,但 console.log( Page Title,document.title); 不是吗?另外,为什么我的document.querySelector无法正常工作?有人有很好的解释吗?我在CasperJS文档中的哪里找到答案?
I'm new to CasperJS. How come this.echo(this.getTitle()); works but console.log("Page Title ", document.title); doesn't? Also why isn't my document.querySelector working? Does anyone have a good explanation? Where in the CasperJS documentation can I find the answer?
这是我的代码:
var casper = require('casper').create(); var url = 'http://www.example.com/'; casper.start(url, function() { this.echo(this.getTitle()); // works this.echo(this.getCurrentUrl()); // works }); casper.then(function(){ this.echo(this.getCurrentUrl()); // works console.log("this is URL: ", document.URL); // doesn't work console.log("Page Title ", document.title); // doesn't work var paragraph = document.querySelectorAll('p')[0].innerHTML; console.log(paragraph); // doesn't work }); casper.run();
编辑:
我正在使用casper.then casper.evaluate现在,它仍然无法正常工作。有什么想法吗?
I'm using casper.thenEvaluate and casper.evaluate now and it's still not working. Any ideas?
var casper = require('casper').create(); var url = 'http://www.example.com/'; casper.start(url, function() { this.echo(this.getTitle()); // works this.echo(this.getCurrentUrl()); // works console.log('page loaded: '); // works }); casper.thenEvaluate(function(){ var paragraph = document.querySelectorAll('p')[0].innerHTML; // doesn't work console.log(paragraph); // doesn't work console.log("Page Title ", document.title); // doesn't work }); casper.run();
推荐答案
您必须调用依赖于<$ c的函数$ c>文档和 this.evaluate :
var paragraph = this.evaluate(function() { return document.querySelector('p').innerHtml; });
如有疑问,请咨询。
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