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Javscript Json数据操作(数据增,删,改,查)

 
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<!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">
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<head>
    <title>Json Test</title>
    <style type="text/css">
        div
        {
            padding: 10px;
            border: solid 1px #222;
            margin: 5px;
            font-size: 12px;
        }
    </style>
 
    <script type="text/javascript">
        // 存储用户对象的数据格式
        // [
        //  {'uid':'123','pwd':'123456'},
        //  {'uid':'124','pwd':'123456'},
        //  {'uid':'125','pwd':'123456'}
        // ]
 
        function $(obj) {
            return typeof (obj) == "string" ? document.getElementById(obj) : obj;
        }
 
        var json = [];//申明数字
 
        //添加新用户
        function add() {
            var uid = $('uid').value;
            var pwd = $('pwd').value;
            for (var i = 0; i < json.length; i++) {
                if (json[i].uid == uid) {
                    return;
                }
            }
            json.push({ "uid": uid, "pwd": pwd });
            show(json);
        }
        //删除用户
        function del() {
            var uid = $('uid').value;
            for (var i = 0; i < json.length; i++) {
                if (json[i].uid == uid) {
                    json.splice(i, 1);
                    break;
                }
            }
            show(json);
        }
        //更新用户密码
        function frs() {
            var uid = $('uid').value;
            var pwd = $('pwd').value;
            for (var i = 0; i < json.length; i++) {
                if (json[i].uid == uid) {
                    json[i].pwd = pwd;
                    break;
                }
            }
            show(json);
        }
        //显示用户列表
        function show(json) {
            var html = "";
            for (var i = 0; i < json.length; i++) {
                html += "UID:" + json[i].uid + ";PWD:" + json[i].pwd + "/r/n";
            }
            $('t').innerText = html;
        }
    </script>
 
</head>
<body>
    <input type="hidden" value="" id="selectedUsers" />
    <div>
        UID:<input type="text" id="uid" /> PWD:
        <input type="text" id="pwd" />
        <a href="javascript:void(0);" title="" onclick="add();">添加用户</a> <a
 
href="javascript:void(0);"
            title="" onclick="del();">删除用户</a> <a href="javascript:void(0);"
 
title="" onclick="frs();">更新用户</a>
    </div>
    <div>
        现有用户:
        <p id="t">
        </p>
    </div>
</body>
</html>

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