JavaScript-需要加载外部JS文件的功能 [英] JavaScript - function to load external JS files is needed

问题描述

最近，我将按钮之类的Facebook添加到了我的网站，Twitter跟随了我们，Twitter以及了Google +1按钮.当我告诉他们加载我的JS脚本时.

Recently I added to my website facebook like button, twitter follow us button and google +1 button. I want their JS scripts to load when I tell them to load.

因此，我需要一个加载外部JS文件的函数.我不需要知道文件何时完成加载(不需要回调).

Therefore, I need a function that load external JS files. I don't need to know when the file finished to load (callback is not needed).

我在Internet上找到了一些方法/功能，但是我想知道哪种方法/功能最适合这种情况?

I found some methods/functions on the Internet, but I want to know which would be the best choice for this situation?

4种动态方法加载外部JavaScript
动态加载JS库并检测何时加载
加载外部文件的最佳方法JavaScript

4 ways to dynamically load external JavaScript
Dynamically loading JS libraries and detecting when they're loaded
The best way to load external JavaScript

谢谢.

修改: 添加了我发现的方法/功能.

Edit: Added the methods/function I found.

推荐答案

这可能会有所帮助:

function loadScript(url, callback){

    var script = document.createElement("script")
    script.type = "text/javascript";

    if (script.readyState){  //IE
        script.onreadystatechange = function(){
            if (script.readyState == "loaded" ||
                    script.readyState == "complete"){
                script.onreadystatechange = null;
                callback();
            }
        };
    } else {  //Others
        script.onload = function(){
            callback();
        };
    }

    script.src = url;
    document.getElementsByTagName("head")[0].appendChild(script);
}

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