How to include an external javascript file conditionally?

This question already has an answer here:

Dynamically load a JavaScript file 22 answers

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This question has been asked before in Include a Javascript File in another Javascript File. This peice of code may fit what you have been looking for

function include(filename)
{
   var head = document.getElementsByTagName('head')[0];

   var script = document.createElement('script');
   script.src = filename;
   script.type = 'text/javascript';

   head.appendChild(script)
}   

if that script does not work, i suggest you to look over and read the post above: Include a Javascript File in another Javascript File.

I hope this helps, it may not be the answer you had been looking for, but it may just help.

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您只需像异步一样加载它

if(yourCondition==true){
var d = document,
            h = d.getElementsByTagName('head')[0],
            s = d.createElement('script');
    s.type = 'text/javascript';
    s.async = true;
    s.src = 'http://external/js/file/url.js';
    h.appendChild(s);
}

---

你可以使用像这样的东西：

<script type="text/javascript">

   if (condition == true) {

      document.getElementsByTagName("head")[0].innerHTML += ("<script src="http://external/js/file/url.js" type="text/javascript"></script>");

   }

</script>

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