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同步加载（会阻塞后续代码执行）

loadAsyncScript(src, callback = function () {}) { // 同步加载js        const head = document.getElementsByTagName('head')[0];        const script = document.createElement('script');        script.setAttribute('type', 'text/javascript');        script.setAttribute('src', src);        script.setAttribute('async', true);        script.setAttribute('defer', true);        head.appendChild(script);        if (script.readyState) { // ie            script.onreadystatechange = function () {                var state = this.readyState;                if (state === 'loaded' || state === 'complete') {                    callback();                }            }        } else {            script.onload = function () {                callback();            }        }    },

异步加载JS 

loadJS(src) { // 异步加载js        const s = document.createElement('script');        s.setAttribute('src', src);        s.setAttribute('charset', 'utf-8');        document.body.appendChild(s);    },

使用例子

loadAsyncScript("__SYS_GLOBAL_URL__static/app/js/tvp.player_v2_zepto.js", function () {            loadAsyncScript("__SYS_GLOBAL_URL__static/app/js/video.js", function () {                _player = new MyPlayer(pageGlobal)            });        });

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