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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。

这篇关于为什么普通的JavaScript在CasperJS中不起作用?的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持!

09-05 09:19
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