<!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>无标题页</title>
<script language="javascript">
function calc(){
alert("12.345"+2);
alert(parseInt("12.345")+2);
alert(parseFloat("12.345")+2);
alert("12.345".length);
var arr=['ab','cd','efg'];
alert(arr.length);
}
</script>
</head>
<body>
<input type="button" value="计算" onclick="calc()" />
</body>
</html>