如何检查是否已包含JS文件？ [英] How can I check if a JS file has been included already?

问题描述

我已将javascript拆分为不同的文件。我想阻止，javascript文件加载两次。我该怎么做？

I have split my javascript in different files. I want to prevent, that javascript files are loaded twice. How can I do that?

推荐答案

这是一个测试，看看是否已根据js文件的路径包含脚本：

Here's a test to see if a script has been included based on the path to the js file:

function isScriptAlreadyIncluded(src){
    var scripts = document.getElementsByTagName("script");
    for(var i = 0; i < scripts.length; i++) 
       if(scripts[i].getAttribute('src') == src) return true;
    return false;
}

它适用于所有未通过AJAX加载的脚本，尽管你可能想要如果你运行了jsonp代码，请修改它。

It will work for all scripts not loaded through AJAX, though you may want to modify it if you have jsonp code running.

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