jQuery小案例

2022-12-06 07:17:29

Jquery例子1_占位符使用
需求: 点击第一个按钮后自动去check 后面是否有按钮没有选中, 如有则提示错误消息.

<html>

<head>

<script type="text/javascript">

function check()

{

    String.prototype.format = function(){

        var args = arguments;

        return this.replace(/\{(\d+)\}/g,

            function(m,i){

                return args[i];

            });

    }  

    var errorMessage = "项目{0} {1} {2}没有被勾选!";

    var firstValue = "";

    var secondValue = "";

    var lastValue = "";

    if (document.getElementById("check1").checked)

    {

        if (!document.getElementById("check2").checked)

        {

            firstValue = "2";

        }

        if (!document.getElementById("check3").checked)

        {

            secondValue = "3";

        }

        if (!document.getElementById("check4").checked)

        {

            lastValue = "4";

        }

        alert(errorMessage.format(firstValue,secondValue,lastValue));

    }

}

</script>

</head>

<body>

<form>

 <input type="checkbox" id="check1" onclick="check()">1</input>

 <input type="checkbox" id="check2">2</input>

 <input type="checkbox" id="check3">3</input>

 <input type="checkbox" id="check4">4</input>

</form>

</body>

</html>

Jquery例子2_模拟微信红包(摘自网络)
需求: 模拟微信抢红包

<!DOCTYPE html>

<html>

    <head>

        <meta charset="UTF-8">

        <title>仿微信抢红包</title>

        <style>

            html,body,div{margin:0;padding:0;}

            body{background:#EAEAEA;font:16px/1.8 "微软雅黑";padding-bottom:20px}

            input{margin:0;display:inline-block;border:1px solid #ddd;padding:4px 2px;font-size:16px;font-family:"微软雅黑";margin-right: 5px;}

            input:focus{border-color:#3C9BD1;outline:none;}

            .wrap,.list { margin: 50px auto; width: 300px;}

            .title{   font-size: 42px;   color: #464646;text-align: center;}

            .line{height:40px;line-height:40px;text-align: center;}

            .btn{display:block;background:#3C9BD1;color:#fff;line-height: 40px;height:40px;text-align: center;width:200px;margin:0 auto;margin-top:50px;text-decoration: none;transition:all .3s linear;border-radius: 2px;}

            .btn:hover{opacity:.9;}

            .list{width:500px;border:1px solid #DBDBDB;padding:10px;BACKGROUND:#F5F5F5;text-align: center;}

            .list p span {color: red; padding: 0 8px;}

            .list p:empty{background: #000000;}

            .list:empty{display: none;}

            .link{position:fixed;height:20px;font-size: 12px;color:#999;text-align: center;width: 100%;bottom:0;line-height:20px;margin:0;padding:0;    background: #EAEAEA;padding:5px 0;}

            .link a{font-size:12px;color:#999;}

        </style>

    </head>

    <body>

        <h1 class="title">javascript实现仿微信抢红包</h1>

        <div class="wrap">

            <div class="line">红包个数：<input type="text" name="packetNumber" value="5" onkeyup="this.value=this.value.replace(/\D/g,'')" onafterpaste="this.value=this.value.replace(/\D/g,'')" maxlength="10">个</div>

            <div class="line">总&ensp;金&ensp;额：<input type="text" name="money" value="5" onkeyup="if(isNaN(value))execCommand('undo')" onafterpaste="if(isNaN(value))execCommand('undo')" maxlength="10">元</div>

            <div class="line"><a class="btn" href="javascript:;">发红包</a></div>

        </div>

        <div class="list"></div>

        <p class="link">参考<a target="_blank" href="https://www.zybuluo.com/yulin718/note/93148">《微信红包的架构设计简介》</a>文章</p>

<script>

 "use strict";

var _createClass = function() {

    function defineProperties(target, props) {

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

            var descriptor = props[i];

            descriptor.enumerable = descriptor.enumerable || false;

            descriptor.configurable = true;

            if ("value" in descriptor)

                descriptor.writable = true;

            Object.defineProperty(target, descriptor.key, descriptor);

        }

    }

    return function(Constructor, protoProps, staticProps) {

        if (protoProps)

            defineProperties(Constructor.prototype, protoProps);

        if (staticProps)

            defineProperties(Constructor, staticProps);

        return Constructor;

    }

    ;

}();

function _classCallCheck(instance, Constructor) {

    if (!(instance instanceof Constructor)) {

        throw new TypeError("Cannot call a class as a function");

    }

}

var MoneyPacket = function() {

    function MoneyPacket(packNumber, money) {

        _classCallCheck(this, MoneyPacket);

        this.min = 0.01;

        this.flag = true;

        this.packNumber = packNumber;

        this.money = money;

        if (!this.checkPackage()) {

            this.flag = false;

            return {

                "flag": this.flag

            };

        }

    }

    _createClass(MoneyPacket, [{

        key: "checkPackage",

        value: function checkPackage() {

            if (this.packNumber == 0) {

                alert("至少需要设置1个红包");

                return false;

            }

            if (this.money <= 0) {

                alert("红包总金额不能小于0");

                return false;

            }

            if (this.packNumber * this.min > this.money) {

                alert("单个红包金额不可低于0.01元");

                return false;

            }

            return true;

        }

    }]);

    return MoneyPacket;

}();

var getRandomMoney = function getRandomMoney(packet) {

    if (packet.packNumber == 0) {

        return;

    }

    if (packet.packNumber == 1) {

        var _lastMoney = Math.round(packet.money * 100) / 100;

        packet.packNumber--;

        packet.money = 0;

        return _lastMoney;

    }

    var min = 0.01

      ,

    max = packet.money / packet.packNumber * 2

      ,

    money = Math.random() * max;

    money = money < min ? min : money;

    money = Math.floor(money * 100) / 100;

    packet.packNumber--;

    packet.money = Math.round((packet.money - money) * 100) / 100;

    return money;

}

;

(function() {

    var oBtn = document.querySelector(".btn");

    var oList = document.querySelector(".list");

    oBtn.onclick = function() {

        var packetNumber = +document.querySelector("input[name=packetNumber]").value;

        var money = +document.querySelector("input[name=money]").value;

        var str = "";

        var packet = new MoneyPacket(packetNumber,money)

          ,

        num = packet.flag && packet.packNumber || 0;

        console.log("========================================================================");

        for (var i = 0; i < num; i++) {

            var _pack = getRandomMoney(packet);

            str += "<p>第<span>" + i + "</span>个红包:: <span>" + _pack.toFixed(2) + "</span>元&emsp;&emsp;==剩余红包:: <span>" + packet.money.toFixed(2) + "</span> 元<p>";

            console.log("第", i, "个红包::", _pack.toFixed(2), "元      ==剩余红包::", packet.money.toFixed(2), "元");

        }

        str !== "" && (oList.innerHTML = str);

    }

    ;

})();

</script>

    </body>

</html>

Jquery例子3_三级联动

需求: 实现省市县三级联动

<h3>

    您的地址是：

</h3>

<select id="Province" onchange="SelectValueChanged('Province', 'Get_City')">

    <option id="Not_data1">Province</option>

    <option id="GuangDong" value="GuangDong">GuangDong</option>

    <option id="ShanDong" value="ShanDong">ShanDong</option>

    <option id="HuNan" value="HuNan">HuNan</opetion>

</select>

<select id="City" onchange="SelectValueChanged('City', 'Get_Country')">

    <option id="Not_data2">City</option>

</select>

<select id="Country">

    <option id="Not_data3">Country</option>

</select>

"use strict"

//初始化的数据

var placeDictionary = {

    "GuangDong":{

        "GuangZhou":["PanYu","HuangPu","TianHe"],

        "QingYuan":["QingCheng","YingDe","LianShan"],

        "FoShan":["NanHai","ShunDe","SanShui"]

    },

    "ShanDong":{

        "JiNan":["LiXia","ShiZhong","TianQiao"],

        "QingDao":["ShiNan","HuangDao","JiaoZhou"]

    },

    "HuNan":{

        "ChangSha":["KaiFu","YuHua","WangCheng"],

        "ChenZhou":["BeiHu","SuXian","YongXian"]

    }

};

//通过province或city的变化连动

function SelectValueChanged(idType, perpose) {

    var selectedValue = GetSelectedId(idType);

    if(perpose == "Get_City")

    {

        AddCity(selectedValue);

    }

    else if(perpose == "Get_Country")

    {

        AddCountry(selectedValue);

    }

}

function GetSelectedId(id){

    var prop = document.getElementById(id);

    var selectedValue = prop.options[prop.selectedIndex].id;

    return selectedValue;

}

function AddCity(provinceSelectedValue){

    //保持联动的一致性， 当Province的index变化时都需要清空City和Country的值

    $("#City").empty();

    $("#City").append("<option>City</option>");

    $("#Country").empty();

    $("#Country").append("<option>Country</option>");

    var cityNames = placeDictionary[provinceSelectedValue];

    for(var city in cityNames)

    {

        //这里遍历的值直接是value

        var value = "<option id='"+ city +"'>" + city + "</option>";

        $("#City").append(value);

    }

}

function AddCountry(citySelectedValue) {

    //保持联动一致性，当City的index变化时需要清空Country中的值

    $("#Country").empty();

    $("#Country").append("<option>Country</option>");

    var provinceSelectedId = GetSelectedId("Province");

    //获得城市列表

    var countries = placeDictionary[provinceSelectedId][citySelectedValue];

    for(var index in countries)

    {

        //这里index获取的是id 值

        var value = "<option id='"+ countries[index] +"'>" + countries[index] + "</option>";

        $("#Country").append(value);

    }

}

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