JavaScript 之 动态加载JS代码或JS文件

 

2、动态加载JS文件

<script type="text/javascript">
function loadScript(url, callback) {
　　var script = document.createElement("script");script.type = "text/javascript";
　　if(typeof(callback) != "undefined"){if (script.readyState) {script.onreadystatechange = function () {if (script.readyState == "loaded" || script.readyState == "complete") {script.onreadystatechange = null;callback();}};} else {script.onload = function () {callback();};}}script.src = url;document.body.appendChild(script);
}
loadScript("jquery-latest.js", function () { //加载,并执行回调函数
  alert($(window).height());
});
//loadScript("jquery-latest.js"); //加载js文件
</script>