script通过script标签跨域加载数据

 /**********************************************************
 
     说明：跨域请求数据Javascript组件
 ----------------------------------------------------------
     add by OceanHo 2015-4-13 18:18:14
 **********************************************************/
 ; (function (window, undefined) {
 
     var _ap = function () {
     }, _asyncID = 2048, _asyncType = "asynctype", _version = "1.5.0", _cbKey = "cb", _cb = "";
 
     function addSc(url, cbAndParam) {
         var script = createSc();
         script.setAttribute("src", url + "?" + cbAndParam);
         window.document.getElementsByTagName("head")[0].appendChild(script);
     };
 
     function delSc(id) {
         var scripts = getSc();
         for (var i = 0; i < scripts.length; i++) {
             if (scripts[i].attributes["id"]) {
                 if (parseInt(scripts[i].attributes["id"].value) === parseInt(id)) {
                     remove(scripts[i]);
                 }
             }
         }
     };
 
     function remove(script) {
         if ((script) && (script.parentNode)) {
             script.parentNode.removeChild(script);
         }
     };
 
     function clearSc() {
         var scripts = getSc();
         for (var i = 0; i < scripts.length; i++) {
             remove(scripts[i]);
         }
     };
 
     function getSc() {
         var s1 = [];
         var scripts = window.document.getElementsByTagName("script");
         for (var i = 0; i < scripts.length; i++) {
             if (scripts[i].attributes["async"]) {
                 if (scripts[i].attributes["async"].value === _asyncType) {
                     s1.push(scripts[i]);
                 }
             }
         }
         return s1;
     };
 
     function createSc() {
 
         _asyncID++;
         var script = window.document.createElement("script");
         script.setAttribute("id", _asyncID);
         script.setAttribute("async", _asyncType);
         script.setAttribute("type", "text/javascript");
 
         script.onload = script.onreadystatechange = function () {
 
             if (!this.readyState || this.readyState === "loaded" || this.readyState === "complete") {
 
                 delSc(this.attributes["id"].value);
 
                 script.onload = script.onreadystatechange = null;
             }
         }
         return script;
     }
 
     function waitDel(id, interval) {
         window.setInterval(delSc(id), interval);
     };
 
     _ap.fn = _ap.prototype = {
         constructor: _ap,
         version: _version,
         init: function (arg) {
             return new _ap().constructor;
         },
 
         get: function (url, cbk, cb, param) {
             if (!cb) cb = _cb;
             if (!cbk) cbk = _cbKey;
             var qs = this.map(',', param);
             addSc(url, _cbKey + "=" + cb + "&" + qs);
         },
 
         getEasy: function (url, cb, param) {
             if (!cb) cb = _cb;
             var qs = this.map(',', param);
             addSc(url, _cbKey + "=" + cb + "&" + qs);
         },
 
         getCustom: function (url, param) {
             addSc(url, this.map(',', param));
         },
 
         map: function (split, params) {
             var str, strs = [];
             if (typeof params != "string") {
                 params = eval(params);
                 for (var p in params) {
                     strs.push(p + "=" + params[p])
                 }
                 str = strs.join(split);
             } else {
                 str = param;
             }
             return str;
         },
         clear: function () { clearSc(); }
     };
 
     _ap.fn.init.prototype = _ap.fn;
 
     window.CrossLoad = _ap.fn.init();
 
 })(window);
 
 // 使用 、
 <script>
     window.CrossLoad.getEasy("https://www.oceanho.com/common/chat/v2","ReciveMessageHandler",{})
 
     function ReciveMessageHandler(msg){
 
     }
 </script>