javascript问题,求大神指点!!!
下面这段代码,为啥变量a的值还是javascript呢?不应该是全局变量么?和php的不一样么?求详解。谢谢
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312">
</head>
<body>
<script language="javascript">
var a=3;
function send()
{
a="javascript";
var b="语言基础";
alert(a+b);
}
send();
document.write(a);
</script>
</body>
</html>