IE不支持 ES6 Promise 对象的解决方案

* 引入bluebird.js即可完美解决。

   /*ie兼容 Promise*/
    isIE();
    function isIE() { //ie?
        if ( !! window.ActiveXObject || "ActiveXObject" in window) {
            var script = document.createElement("script");
            script.type = "text/javascript";
            script.src = "/js/unity/bluebird.js";
            document.getElementsByTagName('head')[0].appendChild(script);
        }
    }
    /*ie兼容 Promise end*/