<!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>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>无标题文档</title>
</head>
<body>
<script type="text/javascript">
var i=10;
var j=10;
var m=i+j;
document.write(m);//output:20
</script>
<script type="text/javascript">
var string="hello";//定义字符串类型
var i=10;//定义数字类型
var flag=true;//定义bool类型
var arr=[1,2,3,4];//定义int类型的数组
var arr2=["hehe","xixi","haha","huhu"];//定义String类型的数组
var arr3=new Array("hehe","xixi","haha","huhu");//第二种定义字符串数组
document.write(arr3[2]);//output:haha
</script>
<script type="text/javascript">
var arr=new Array();
arr[0]=10;
arr[1]=20;
arr[2]=30;
document.write(arr[2]);//output:30
</script>
<script type="text/javascript">
var m=11;
document.write(m);//11
var isnull=null;
m=null;//重置m变量为null
document.write(isnull);//null
document.write(m);//null
</script>
</body>
</html>
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时间： 2024-10-13 20:00:48