<转>动态加载js的方法

    //加载新的js      function _GetJsData(url, callback) {          var scripts = document.createElement("script");          document.body.appendChild(scripts);                scripts.onload = function() {              callback();              document.body.removeChild(this);          };          scripts.onreadystatechange = function() {              if (this.readyState == "loaded") {                  callback();                  document.body.removeChild(this);              }          };          scripts.charset = "GBK";          scripts.src = url;      }      _GetJsData('http://www.uefirst.com/index.js',isok);      var isok=function(){alert('isok')};