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如何实现仿微信抢红包
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互联网集市收集整理的这篇技术教程文章主要介绍了如何实现仿微信抢红包，小编现在分享给大家，供广大互联网技能从业者学习和参考。文章包含4635字，纯文字阅读大概需要7分钟。
内容图文
<!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 金 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  ==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>
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