var a={"n":{"22492109":1,"462440041":1,"54189894":1,"85357830":1,"8857136":1,"912841324":1}};想知道n的大小,
用a.n.length说没定义
for(var colname in a.n)
{
alert( a.n[colname] ); //为1...
alert( colname ); //22492109....}
有什么办法可以直接取得a.n的大小,不用for 来算
用a.n.length说没定义
for(var colname in a.n)
{
alert( a.n[colname] ); //为1...
alert( colname ); //22492109....}
有什么办法可以直接取得a.n的大小,不用for 来算
// 创建某些变量。
var a, key, s = "";
// 初始化对象。
a = {"a" : "Athens" , "b" : "Belgrade", "c" : "Cairo"}
// 迭代属性。
for (key in a) {
s += a[key] + "<BR>";
}
return(s);
}
// 在火狐下可以用
<script type="text/javascript">
<!--
var a={"n":{"22492109":1,"462440041":1,"54189894":1,"85357830":1,"8857136":1,"912841324":1}};
alert(a.n.__count__)
//-->
</script>在IE下 就for in循环吧
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title> new document </title>
<meta name="generator" content="editplus" />
<meta name="author" content="" />
<meta name="keywords" content="" />
<meta name="description" content="" />
</head> <body>
<script type="text/javascript">
<!--
Object.prototype.propertyCount = function() {
var count = 0;
for (var p in this)
{
if (!(this[p] instanceof Function))
count++;
}
return count;
};
Object.prototype.methodCount = function() {
var count = 0;
for (var p in this)
{
if (this[p] instanceof Function)
count++;
}
return count;
};var a={"n":{"22492109":1,"462440041":1,"54189894":1,"85357830":1,"8857136":1,"912841324":1}};
alert(a.propertyCount()); // 1: n
alert(a.methodCount()); // 2: propertyCount; methodCount
alert(a.n.propertyCount()); // 6
alert(a.n.methodCount()); // 2: propertyCount; methodCount
//-->
</script>
</body>
</html>