如下
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML>
<HEAD>
<TITLE> New Document </TITLE>
<META NAME="Generator" CONTENT="EditPlus">
<META NAME="Author" CONTENT="">
<META NAME="Keywords" CONTENT="">
<META NAME="Description" CONTENT="">
</HEAD>
<SCRIPT LANGUAGE="JavaScript">
<!--
function download()
{
var x = "1,2";
var nums = x.split(",");
for (n in nums)
{
alert(n);
}
}
//-->
</SCRIPT>
<BODY>
<input type="button" value="click me" onclick="download()" />
</BODY>
</HTML>
弹出来的居然是0,1
为什么啊?
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML>
<HEAD>
<TITLE> New Document </TITLE>
<META NAME="Generator" CONTENT="EditPlus">
<META NAME="Author" CONTENT="">
<META NAME="Keywords" CONTENT="">
<META NAME="Description" CONTENT="">
</HEAD>
<SCRIPT LANGUAGE="JavaScript">
<!--
function download()
{
var x = "1,2";
var nums = x.split(",");
for (n in nums)
{
alert(n);
}
}
//-->
</SCRIPT>
<BODY>
<input type="button" value="click me" onclick="download()" />
</BODY>
</HTML>
弹出来的居然是0,1
为什么啊?
索引是它的属性。
for(n in nums) 中的n就是它的属性 nums[n]就是它的值
所以n为 0,1
<HTML>
<HEAD>
<TITLE> New Document </TITLE>
<META NAME="Generator" CONTENT="EditPlus">
<META NAME="Author" CONTENT="">
<META NAME="Keywords" CONTENT="">
<META NAME="Description" CONTENT="">
</HEAD>
<SCRIPT LANGUAGE="JavaScript">
<!--
function download()
{
var x = "1,2";
var nums = x.split(",");
for (n in nums)
{
alert(nums[n]);
}
}
//-->
</SCRIPT>
<BODY>
<input type="button" value="click me" onclick="download()" />
</BODY>
</HTML>
for (n in nums) n是数组的下标