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>