CasperJS＆amp;宾语

Question

我正在尝试创建一个article对象构造函数，该构造函数包含文档标题，作者等属性，并根据我传递给它的不同URL使用对象的创建实例。在下面的示例中，this.articleText应该返回一个字符串数组，但它不返回任何内容。

这与this.headlineText形成对比，hello按预期返回字符串document。

鉴于这种差异，我怀疑问题的根本原因是构造函数中使用的var fs = require('fs'); var casper = require("casper").create({ verbose: true, logLevel: "debug" }); function article(title, url) { this.headlineText = title; this.urlString = url; var query = document.querySelectorAll("[itemprop='articleBody']"); this.articleText = Array.prototype.map.call(query, function (e) { return e.innerText; }); } casper.start("http://www.yomiuri.co.jp/economy/20150625-OYT1T50136.html" , function() { this.test.assertExists({ type: 'css', path: '[itemprop="articleBody"]' }, 'Article Exists'); }); casper.run(function() { var test1 = new article("hello","http://www.yomiuri.co.jp/economy/20150625-OYT1T50136.html"); console.log("HEADLINE=="); console.log(test1.headlineText); // returns "hello" console.log("ARTICLE == "); console.log(test1.articleText); // returns nothing this.exit(); }); 对象。但是，输出中没有抛出任何错误，那么我应该如何解决这个问题呢？

任何建议都非常感谢。 （css选择器本身没有问题;如果我使用函数来获取文章字符串，那么这似乎有用。问题是当尝试使用对象来解析数据时）

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Runtime.Serialization;
using Enums;
using DELL.AFP.Management.ProjectGroup;
using Dell.AFP.BizManager;
using Dell.AFP.Entity;
using System.Data;


namespace AFPManagementServiceLibrary.ProjectGroup.Model
{
     [DataContract] 
    public class ProjectGroupInfoResponse
    {
       public ProjectGroupInfoResponse(Dell.AFP.Entity.ProjectGroup ProjectGroup)
       {
           if (ProjectGroup != null)
           {
               CreatedDate = ProjectGroup.CreatedDateTime;
               HigestProjectState = (AFPStateEnum)Convert.ToInt32(ProjectGroup.AFPState);
               CustomerGroup = (CustomerGroupEnum)ProjectGroup.CustomerGroupId;
               ProjectGroupName = ProjectGroup.Title;
               ProjectGroupOwner = ProjectGroup.CreatedByUser;
               IsRestricted = ProjectGroup.IsPublic;

           }
       }
       [DataMember]
       public DateTime CreatedDate { get; set; }

       [DataMember]
       public AFPStateEnum HigestProjectState { get; set; }

       [DataMember]
       public CustomerGroupEnum CustomerGroup { get; set; }

       [DataMember]
       public string ProjectGroupName { get; set; }

       [DataMember]
       public string ProjectGroupOwner { get; set; }

       [DataMember]
       public bool IsRestricted { get; set; }

    }
}

Answer 1

对如何访问页面的文档对象存在误解。 您必须使用evaluate，因为所有页面调用都在沙箱中执行：

CasperJS evaluate()

所以你必须调用evaluate，并从中返回你的querySelectorAll，然后将那个传递给你的函数：）

祝你好运

Answer 2

Whenever you want to run javascript specific code you have to run it using evaluate function,which are executed in a sandbox.

You want to write something like this

casper.then(function() {
        var a = this.evaluate(article(title, url),{title:'hello',url:'url'});
});