使用js给select添加option(兼容IE/Firefox)

前些天在做项目的时候要使用JS给SELECT动态添加OPTION，遇到了个问题，JS代码如下：

while (obj.selectedIndex > -1){
         mot = obj.options[obj.selectedIndex].text;
         mov = obj.options[obj.selectedIndex].value;
         obj.remove(obj.selectedIndex);
         var newoption = document.createElement("OPTION");
         newoption.text = mot;
         newoption.value = mov;
         target.add(newoption);
}

 

而Firefox却不认

target.add(newoption);

出错提示：

uncaught exception: [Exception... "Not enough arguments" nsresult: "0x80570001 (NS_ERROR_XPC_NOT_ENOUGH_ARGS)" location: "JS frame :: http://localhost/untitled.asp :: moveselect :: line 23" data: no]

 

修改代码如下：

while (obj.selectedIndex > -1){
         mot = obj.options[obj.selectedIndex].text;
         mov = obj.options[obj.selectedIndex].value;
         obj.remove(obj.selectedIndex);
         var newoption = document.createElement("OPTION");
         newoption.text = mot;
         newoption.value = mov;
         if(Sys.ie) target.add(newoption);
         if(Sys.firefox) target.appendChild(newoption);
}

 

谢谢各位！是鄙人寡闻了