JavaScript遍历html元素属性

某些时候我们需要遍历控件对象的属性,可以如下操作.

            var e=document.createElement("input");
            e.id="txtID";
            e.type="text";
            var s="";
            var n=0;
            for(var key in e)
            {
                if(n%8==0){s+=key+"="+e[key]+"\r\n";n++}
                else{s+=key+"="+e[key]+";  ";n++}
            }
            alert(s);

对于一些控件某些属性不能够通过htmlElement [key]访问.访问会包Automation错误

例如type="image"的时候.这时候也许那些让我们出错的属性我们并不需要.所有我们可以用try{}cath(){}跳过如下

                   var e=document.createElement("input");
            e.id="txtID";
            e.type="image";
            var s="";
            var n=0;
            for(var key in e)
            {
                try{
                        if(n%8==0)
                        {
                            s+=key+"="+e[key]+"\r\n";n++;
                        }
                        else
                        {
                            s+=key+"="+e[key]+";  ";n++;
                        }
                 }catch(e)
                 {
                    s+=key+"="+"错误的属性；";
                 }
            }
            alert(s);