看看这样行不?<script language="JavaScript"> var test = "aaa" var test1 = new Array("aaa","bbb","ccc") if(test[0]==null) alert("test不是数组") else alert("test是数组") if(test1[0]==null) alert("test1不是数组") else alert("test1是数组")</script>
<SCRIPT LANGUAGE="JavaScript"> var a=1; var b = new Array(); if(a.length==undefined){alert("不是数组")}else{alert("是数组")} if(b.length==undefined){alert("不是数组")}else{alert("是数组")} </SCRIPT>
var chkboxes = document.getElementsByName("Member");That's not array but a collection.
既然Member都不是数组了,怎么还可能还有length属性呢?
var test = "aaa"
var test1 = new Array("aaa","bbb","ccc")
if(test[0]==null)
alert("test不是数组")
else
alert("test是数组")
if(test1[0]==null)
alert("test1不是数组")
else
alert("test1是数组")</script>
var a=1;
var b = new Array();
if(a.length==undefined){alert("不是数组")}else{alert("是数组")}
if(b.length==undefined){alert("不是数组")}else{alert("是数组")}
</SCRIPT>