js动态加载js文件

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try{         function __loadJs(jsFile,callBack){             var new_element = document.createElement("script");             new_element.setAttribute("type", "text/javascript");             new_element.setAttribute("src", jsFile);             document.head.appendChild(new_element);             new_element.onload=function(){                 if(typeof callBack == "function"){                     callBack();                 //test2();              }             }         }         //引入js         __loadJs('http://my.test.com/test2.js');         __loadJs('http://my.test.com/test2.js',function(){ test2();});     }catch(e){         alert("js加载失败"+e);     }