js仿微信抢红包功能

本文实例为大家分享了Android九宫格图片展示的具体代码，供大家参考，具体内容如下

<!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:;" rel="external nofollow" >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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