动态添加JS文件到页面_html/css_WEB-ITnose

/***** 功能：  加载外部JS文件，加载完成后执行回调函数callback***/var utools = {    config: {        id: "",        url: "",        charset: "gb2312",        callback: function () { }    },    merge: function (a, c) {        for (var b in c) a[b] = c[b];        return a    },    getScript: function (a) {        var r = Math.floor(Math.random() * 10000);        this.config = this.merge(this.config, a);        var callback = this.config.callback;        var scriptNode = document.createElement("script");        scriptNode.setAttribute("id", this.config.id);        scriptNode.setAttribute('charset', this.config.charset);        scriptNode.setAttribute('type', 'text/javascript');        scriptNode.setAttribute('src', this.config.url + "?r=" + r);        var head = document.getElementsByTagName("head")[0];        head.appendChild(scriptNode);        scriptNode[document.all ? "onreadystatechange" : "onload"] = function () {            if (!this.readyState || this.readyState == "loaded" || this.readyState == "complete") {                if (callback) callback();                scriptNode.onreadystatechange = scriptNode.onload = null;                scriptNode.parentNode.removeChild(scriptNode)            }        };    }}//调用方式

utools.getScript({url:"js文件路径"});