如何运行时(动态)加载js脚本|JavaScript

如何运行时(动态)加载js脚本呢?看看下边的Demo:

if(typeof(jQuery) == "undefined") {
	var script = document.createElement("script");
	script.type = "text/javascript";
	script.src = "https://ajax.googleapis.com/ajax/libs/jquery/1.7.1/jquery.min.js";
	
	document.head.appendChild(script);
}

$(document).ready(function(){
	alert("Hello World!");
});


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