javascript動態建立script標籤,載入完成後調用回調

標籤：

代碼如下:

        var head = document.getElementsByTagName(‘head‘)[0];        var script = document.createElement(‘script‘);        script.type = ‘text/javascript‘;        script.charset = ‘GBK‘;        script.onload = script.onreadystatechange = function() {            if (!this.readyState || this.readyState === "loaded" || this.readyState === "complete" ) {                callback();                script.onload = script.onreadystatechange = null;            }        };        script.src= url;        head.appendChild(script);

這段代碼實現了動態建立script標籤,然後插入到head標籤中.然後當js載入完畢的時候調用callback回調.

想解釋點什麼,但覺得實在沒什麼好說的...好吧...就這樣吧...看看就行了...

javascript動態建立script標籤,載入完成後調用回調