<a>onclick在FF中导致“不是功能”，但IE正常</a>
[英]<a> onclick causes “is not a function” in FF, but IE ok
问题描述
My code below works great in IE8, but in FF 3.5 clicking the link causes an error that "start_upload is not a function". 
我的以下代码在IE8中效果很好，但是在FF 3.5中，单击链接会导致错误“ start_upload不是函数”。 What is going on? 到底是怎么回事？ (Of course start_upload is a valid function that works fine in IE) （当然，start_upload是一个有效的函数，可以在IE中正常工作）
<div align="left">
<a href="#" onClick="start_upload();"
onMouseOver="start_upload.src='/Images/Buttons/Upload-glow.gif'"
onMouseOut="start_upload.src='/Images/Buttons/Upload.gif'">
<img src="/Images/Buttons/Upload.gif" id="start_upload" width="90" height="25" border="0"></a>
</a>
</div>
3 个解决方案
解决方案1
3 2011-05-20 02:35:25
That is because of the way on.... events are handled, or are standardly supposed to be handled. 那是因为正在进行on....事件已被处理，或者通常应该被处理。 The context of the onclick inline function is the <a> element to which it was attached, then its parent, then its parent, so on until document and window . onclick内联函数的上下文是其onclick到的<a>元素，然后是其父项，然后是其父项，依此类推，直到document和window为止。 Since IE supports referencing items by ID (and FF should, but still don't do it) it works. 由于IE支持按ID引用项目（FF应该，但仍然不这样做），因此它可以工作。 However, it's correct anyways - start_upload is not a function. 但是，无论如何都是正确的start_upload不是函数。 It's an image. 这是一张图片。 What do you intend start_upload(); 您打算怎么做start_upload(); to do, exactly? 去做，准确吗？ You can set its src and that's correct, but you cannot invoke an element as a function. 您可以设置其src ，这是正确的，但是您不能将元素作为函数调用。
解决方案2
1 2011-05-20 13:36:48
What's going on is that IE is violating the ECMAScript spec. 发生的是IE违反了ECMAScript规范。 When you do start_upload there it resolves it to either a function or an element depending on whether it's followed by () or not. 当您在其中执行start_upload ，它会根据是否在()之后将其解析为函数或元素。 In Gecko start_upload in that situation resolves to the element in all cases, and then you're trying to call an element. 在这种情况下，在Gecko中， start_upload在所有情况下都解析为该元素，然后您尝试调用一个元素。
解决方案3
0 2011-05-20 03:10:59
Somehow,your code is running smoothly in Firefox also (assumed that you have define start_upload function). 某种程度上，您的代码也可以在Firefox中顺利运行（假设您已定义start_upload函数）。 Here is my code which works fine. 这是我的代码，可以正常工作。 Also see, you have close </a> two times (that should not be a problem). 另请参见，您已经两次关闭</a> （这应该没问题）。
<body>
<div align="left">
<a href="#" onClick="start_upload();"
onMouseOver="start_upload.src='/Images/Buttons/Upload-glow.gif'"
onMouseOut="start_upload.src='/Images/Buttons/Upload.gif'">
<img src="/Images/Buttons/Upload.gif" id="start_upload" width="90" height="25" border="0">
</a>
</div>
</body>
</html>
<script>
function start_upload()
{
alert ("a");
}
</script>
声明:本站的技术帖子网页，遵循CC BY-SA 4.0协议，如果您需要转载，请注明本站网址或者原文地址。任何问题请咨询:yoyou2525@163.com.