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js的数组、对象数组和对象的定义和js内部对象和with、for..in的用法

2012-08-15 10:32 435 查看
<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>

<%

String path = request.getContextPath();

String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";

%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">

<html>

<head>

<base href="<%=basePath%>">

<title>My JSP 'js2.jsp' starting page</title>

<meta http-equiv="pragma" content="no-cache">

<meta http-equiv="cache-control" content="no-cache">

<meta http-equiv="expires" content="0">

<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">

<meta http-equiv="description" content="This is my page">

<!--

<link rel="stylesheet" type="text/css" href="styles.css">

-->

<script type="text/javascript">

//with是锁定对象

with(document)

{

writeln("<ol>");

writeln("<li>");

write("曹欢");

write("</li>");

write("<li>");

write("曹娟");

write("</li>");

write("</ol>");

writeln("<ul>");

writeln("<li>");

write("曹欢");

write("</li>");

write("<li>");

write("曹娟");

write("</li>");

write("</ul>");

};

var i = 0

function large()

{

i++;

if(i%2==1)

{

document.getElementById("image").width = 200;

}

else

{

document.getElementById("image").width = 468;

}

}

//for..in的使用以及对象的定义方式的解释

function member(name, age)//相当于构造函数

{

this.name = name;

this.age = age;

}

function showproperties(obj, objstring)

{

for(var i in obj)

{

document.write(objstring + "." + i + " = " + obj[i] + "<br/>");

}

}

var obj = new member("张三", 21);//建立对象,里面有两个属性(name, age)

showproperties(obj, "person");

//日期对象Date 月份是0-11,星期天使使星期七

/*var date = new Date();//如果构造函数没有传递参数,则可以写成new date不需要加后面的()

alert(date.getYear());

alert(date.getFullYear());

alert(date.getMonth()+1);

alert(date.getDate());

alert(date.getDay()+2);

document.write("现在时间是:"+date.getHours()+":"+date.getMinutes()+":"+date.getSeconds());*/

//数组,数组里存放的对象不一定要是同一种类型,数组默认的数据是undefined

var arr = new Array(3);

arr[0] = "曹欢";

var arr1 = new Array("曹欢",1,false);

//alert(arr1[2]);

var arr2 = ["caohuan",1,false];

alert(arr2[2]);

alert(arr2.length);

//一些练习

for(var i = 0; i < 10; i++)

{

//document.write(i+"<br/>");

}s

</script>

</head>

<body>

<!-- <img id="image" src="image/a.jpg.jpg"></img> <input type="button" onclick="large()" value="点击有惊喜啊!"> -->

</body>

</html>

<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>

<%

String path = request.getContextPath();

String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";

%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">

<html>

<head>

<base href="<%=basePath%>">

<title>My JSP 'js3.jsp' starting page</title>

<meta http-equiv="pragma" content="no-cache">

<meta http-equiv="cache-control" content="no-cache">

<meta http-equiv="expires" content="0">

<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">

<meta http-equiv="description" content="This is my page">

<!--

<link rel="stylesheet" type="text/css" href="styles.css">

-->

<script type="text/javascript">

//一维数组的一些方法length join toString reverse valueOf push(添加数据) pop(取出数据)

var arr = ["曹欢","曹娟","爸爸",'妈妈'];

/*document.writeln(arr.length+"<br>");

document.writeln(arr.join(":")+"<br>");//join(参数)将数组转换成字符串,参数表示用什么分开(分隔符)

document.write(arr.reverse()+"<br>");//reverse()使数组翻转,改变的是原数组。

document.write(arr+"<br>");

document.write(arr.valueOf());*/

arr.push("苹果");

//alert(arr.pop())移除最上面的那个元素,并返回那个元素

//alert(arr[0]);

//二维数组

var arr2 = new Array(3);

arr2[0] = new Array(3);

arr2[0].push("a1");

arr2[0].push("a2");

arr2[0].push("a3");

arr2[1] = new Array(3);

arr2[1][0] = "b1";

arr2[1][1] = "b2";

arr2[1][2] = "b3";

arr2[2] = new Array(3);

arr2[2][0] = "c1";

arr2[2][1] = "c2";

arr2[2][2] = "c3";

for(var i = 0; i < arr2.length; i++)

{

for(var j = 0; j < arr2[i].length; j++)

{

document.write(arr2[i][j]+"<br/>");

}

}

//关于字符串的一些处理,

var str = new String("I love you");

//alert(str);

var str1 = "真的吗?";

//alert(str1);

//一些常见的方法charAt indexOf lastIndexOf replace search substring

with(document)

{

write("----------------------------------------","<br/>");//注这里用逗号和加号的效果一样

write(str.length,"<br/>");//注意这里的length不要加()

write(str.toUpperCase()+"<br/>");

write(str.charAt(2)+"<br/>");//返回某个位置的字符

write(str.indexOf('ve'),"<br/>");//返回某个字符的位置,如果不包含就返回-1

write(str.lastIndexOf('ve'),"<br/>");

write(str.replace('I','我'),'<br/>');//代替的只是个副本,并不是str本身

write(str,'<br/>');

write(str.search('I'),"<br/>");//返回该正则表达式的第一次出现的位置

write(str.substring(0,3),"<br/>");

}

//一个简单的例子

function go()

{

var emailValue = document.getElementsByName('email')[0].value;

if(emailValue.indexOf('@')==-1)

{

alert("不合法的email");

return;

}

alert("正确");

}

</script>

</head>

<body>

<input type="text" value="asd" name="email"><input type="button" onclick="go()" value="提交">

</body>

</html>
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