document.readyState无法在Firefox和Chrome中运行 [英] document.readyState not working in Firefox and Chrome

问题描述

在我的应用程序中，我为每个 1000ms 调用一个方法来检查文档readyState。以下是我正在使用的代码，

In my application, I am calling a method for every 1000ms to check the document readyState. Following is the code which I am using,

var success=setInterval(""CheckState()"",1000);

function CheckState(){

if($get('businessDownl').document.readyState=="interactive" || 
      $get('businessDownl').document.readyState=="complete"){
           alert("Great");
           clearInterval(success);
  } 
}

此代码在IE浏览器中正常工作。但是失败了Firefox和Chrome浏览器。我尝试使用
$ get（'businessDownl'）。readyState ，它打印为未定义。有谁能告诉我如何在上面的场景中使用readyState for FF和chrome？

This code works fine in IE browser.But fails in Firefox and Chrome browser. I tried using $get('businessDownl').readyState also, it is printing as undefined. Can anybody tell me how to use the readyState for FF and chrome in the above scenario ?

推荐答案

注意：为了能够访问iframe的文档，因此它是 readyState ，你需要访问iframe中的域（无论使用jQuery）。

欲了解更多信息，请查看这里。

NOTE: In order to be able to access the document of an iframe and thus it's readyState, you need to have access to the domain in the iframe (regadless of the use of jQuery).
For more info, take a look here.

您可以使用iframe的 contentWindow 属性（不需要jQuery）来实现。

请注意，要访问iframe的文档，您必须先将元素添加到DOM中（例如，使用 window.document.appendChild（））。

You could do it using the iframe's contentWindow property (no jQuery required).
Note that, in order to access the iframe's document, you have to add the element to the DOM first (e.g. using window.document.appendChild()).

示例代码：

var businessDownl = document.createElement('iframe');
document.body.appendChild(businessDownl);
...
var state = businessDownl.contentWindow.document.readyState;

另请参阅 简短演示 。

[测试最新版本的Firefox和Chrome。]

See, also, this short demo.
[Tested on latest versions of Firefox and Chrome.]

（请注意，因为iframe加载速度很快，有时你只看到已完成，有时加载和已完成 - 一旦我甚至幸运地看到未初始化：D）。

(Notice that, because the iframe loads quickly, sometimes you see only "completed", sometimes "loading" and "completed" - once I was even lucky enough to see "uninitialized" too :D).

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