JS火狐与IE的差别

function isIE(){ //ie?

       if (window.navigator.userAgent.toLowerCase().indexOf("msie")>=)

          return true;

       else

          return false;

    }

    if(!isIE()){ //firefox innerText define

        HTMLElement.prototype.__defineGetter__("innerText", function(){

            var textRange = this.ownerDocument.createRange();

            textRange.selectNodeContents(this);

            return textRange.toString();

            var anyString = "";

            var childS = this.childNodes;

            for(var i=; i<childS.length; i++){

               if(childS[i].nodeType==)

                 anyString += childS[i].tagName=="BR" ? '\n' : childS[i].innerText;

               else if(childS[i].nodeType==)

                 anyString += childS[i].nodeValue;

            }

             return anyString;

       });

       HTMLElement.prototype.__defineSetter__("innerText",function(sText){

          this.textContent=sText;

       });

    }