iframe contentWindow is undefined when use window.

2019-04-22 04:56发布

站内文章 / JavaScript
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问题:

If use following way to get the contentWindow, the value is undefined

<html>
<head>
    <title>iframe test</title>
</head>
<body>
    <iframe id="frame1" src="frame1.html" name="frame1"></iframe>
<script>
    document.body.onload = function() {
        console.info("index loaded");
        var frame1 = window.frames["frame1"];
        console.info(frame1.contentWindow);
    }
</script>
</body>
</html>

If use the other way like following, it works fine:

var frame1 = document.getElementById("frame1");
console.info(frame1.contentWindow);

I tested on FF 29.0.1, chrome 34， IE11, they all work the same way.

So I have two questions:

  1. why the first way can't get contentWindow value
  2. iframe.contentWindow is compatible in all browser?

回答1:

window.frames["frame1"];

is the contentWindow, it get's a named window, and in your case it's the same thing as 

document.getElementById("frame1").contentWindow

FIDDLE



标签： javascript html iframe
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