<!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>
</html>
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