问题描述
我正在动态地将< script> 标记添加到网页的< head> ，而我'我希望能够以某种方式判断加载是否失败 - 404，加载脚本中的脚本错误等等。
I'm dynamically adding <script> tags to a page's <head>, and I'd like to be able to tell whether the loading failed in some way -- a 404, a script error in the loaded script, whatever.
在Firefox中，这有效：
In Firefox, this works:
var script_tag = document.createElement('script');
script_tag.setAttribute('type', 'text/javascript');
script_tag.setAttribute('src', 'http://fail.org/nonexistant.js');
script_tag.onerror = function() { alert("Loading failed!"); }
document.getElementsByTagName('head')[0].appendChild(script_tag);
但是，这在IE或Safari中不起作用。
However, this doesn't work in IE or Safari.
有没有人知道如何在Firefox以外的浏览器中使用它？
Does anyone know of a way to make this work in browsers other than Firefox?
（我认为不需要放置特殊代码的解决方案在.js文件中是一个很好的。它不够优雅且不灵活。）
(I don't think a solution that requires placing special code within the .js files is a good one. It's inelegant and inflexible.)
推荐答案
脚本标签没有错误事件。您可以判断它何时成功，并假设它在超时后未加载：
There is no error event for the script tag. You can tell when it is successful, and assume that it has not loaded after a timeout:
<script type="text/javascript" onload="loaded=1" src="....js"></script>
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