html5仿淘寶,京東實現紅包雨效果（程式碼實例）

這篇文章就跟大家分享html5仿淘寶,京東實現紅包雨效果的實例代碼。有一定的參考價值，有需要的朋友可以參考一下，希望對你們有幫助。

本紅包雨專案是基於HTML5的遊戲框架Phaser寫的,最終形成的是一個canvas,所以性能很好,但是必須要說的是這個框架比較大,壓縮後也有700K左右,所以請慎用.

代碼位址: https://github.com/AmosXu/red-packet-rain

1. 效果顯示

##     

 圖片依序是倒數計時頁面,搶紅包頁面,拆紅包頁,紅包展示頁,這些頁面都是寫在一個canvas裡面的,無刷新的切換效果,性能超級棒

2.程式碼展示

  貼上主要的程式碼js程式碼與註解

  
  //初始化图片
  let imgjishi = 'assets/img/daojishi.png'
  let bgPlan = 'assets/img/bg-plan.jpg'
  let bgRainer = 'assets/img/bg-rainer.jpg'
  let redpacket = 'assets/img/redpacket.png'
  let close = 'assets/img/close.png'
  let dialogExit = 'assets/img/dialog-exit.png'
  let buttonCancel = 'assets/img/button-cancel.png'
  let buttonExit = 'assets/img/button-exit.png'
  let openRedpacket = 'assets/img/open-redpacket.png'
  let open = 'assets/img/open.png'
  let redpacketResult = 'assets/img/redpacket-result.png'
  let buttonUseTicket = 'assets/img/button-use-ticket.png'
  let buttonContinue = 'assets/img/button-continue.png'
  let cursorAnimation = 'assets/img/cursor-animation.png'

  let states = {}
  let QingLvGroup;
  let hitNum = 0;
  let config = {
      selfPool:40,
      selfPic:'redpacket',
      rate:0.5,
      maxSpeed:1200,
      minSpeed:400,
      max:95
  }

  let ids = [0, 1, 2, 3, 4, 5]
  let redpackets = ['全场优惠50元', '20元代金券', '全场优惠50元', '20元代金券', '全场优惠50元', '20元代金券']
  let time = 25;
  let getIds = []
  let radio = document.documentElement.clientWidth/375;
  let e;

  function rfuc(n){
    return n*radio;
  }

  //初始化红包
  function QingLv(config, game){
    this.init = function(){
        this.config = config;
        QingLvGroup = game.add.group();
        QingLvGroup.enableBody = true;
        QingLvGroup.createMultiple(config.selfPool, config.selfPic); //初始化多个红包
        QingLvGroup.setAll('anchor.y',1)
        QingLvGroup.setAll('outOfBoundsKill', true);
        QingLvGroup.setAll('checkWorldBounds', true);
        this.maxWidth = game.width + 300;

        game.time.events.loop(Phaser.Timer.SECOND * config.rate, this.createQL, this);
    };
    this.createQL = function(){
        e = QingLvGroup.getFirstExists(false);
        
        if(e) {
            if(hitNum >= config.max) {
                return;
            }
            hitNum++;
            e.events.onInputDown.removeAll();
            var ram= Math.random();
            ram =ram<0.5?ram+=0.5: ram;
            e.loadTexture(this.config.selfPic)
            e.alpha = 1;
            e.angle = 30
            // e.scale.setTo(rfuc(ram));
            e.reset(game.rnd.integerInRange(100, this.maxWidth), 100)  //红包生成的位置
            e.body.velocity.x = game.rnd.integerInRange(-300, -150);   //红包移动的速度
            e.body.velocity.y = game.rnd.integerInRange(config.minSpeed, config.maxSpeed);
            e.inputEnabled = true;
            e.events.onInputDown.add(this.hitted, this)
        }
    };
    this.hitted = function(sprite){
        if(Math.random() < 1/4 && ids.length > 0) {
          sprite.kill();
          
          //点击获得红包,游戏暂停
          game.paused = true;

          //背景
          let hexGraphics = new Phaser.Graphics().beginFill(0x000000, 0.5).drawRect(0,0,document.documentElement.clientWidth,document.documentElement.clientHeight + 2);
          let pausedMask = game.add.sprite(0, 0, hexGraphics.generateTexture())
          
          let openDialog = game.add.sprite(rfuc(62), rfuc(150), 'openRedpacket')
          
          let open = game.add.sprite(rfuc(130), rfuc(300), 'open')
          open.inputEnabled = true;
        
          let result = game.add.sprite(rfuc(0), rfuc(120), 'redpacketResult')
          result.visible = false

          let userTicket = game.add.sprite(rfuc(78), rfuc(445), 'buttonUseTicket')
          userTicket.visible = false

          let goOn = game.add.sprite(rfuc(198), rfuc(445), 'buttonContinue')
          goOn.visible = false

          let ticketText = {};
          let link = ''
          
          //拆红包
          let clickOpen = function() {

            //游戏暂停时,点击事件无效,只能通过这种画热点的形式来绑定事件
            let openRect = new Phaser.Rectangle(rfuc(130), rfuc(315), 239, 239).copyFrom(open);

            if (openRect.contains(game.input.x, game.input.y)) {
              let currentWidth = open.width

              //拆红包动画
              let tempArr = [2, 4, 8, 4, 2, 1]
              let index = 0;
              let timer = setInterval(function() {
                if (index > tempArr.length-1) { index = 0 }
                open.width = currentWidth / tempArr[index]
                open.height = open.height
                open.left = game.world.centerX - open.width / 2
                ++index
              }, 200)
              game.input.onDown.remove(clickOpen, this);
              let arrIndex = Math.floor(Math.random() * ids.length)
              let redpacketId = ids.splice(arrIndex, 1)
              getIds.push(redpacketId[0])

              setTimeout(()=> {
                timer && clearInterval(timer)
                document.getElementById('audioOpen').play()
                let text = redpackets[redpacketId[0]]
                ticketText=game.add.text(0, rfuc(338),text,{fill:'#ffe67d',fontSize:'46px',fontWeight: 'bolder'})
                ticketText.left = game.world.centerX - ticketText.width / 2    //文字相对于屏幕左右居中
                openDialog.visible = false
                open.visible = false
                result.visible = true
                userTicket.visible = true
                goOn.visible = true
                game.input.onDown.add(clickButton, this)
              }, 1000)
            } 
          };

          let clickButton = function() {
            let userTicketRect = new Phaser.Rectangle(rfuc(78), rfuc(445), 194, 66).copyFrom(userTicket);
            let continueRect = new Phaser.Rectangle(rfuc(198), rfuc(445), 194, 66).copyFrom(goOn);

            if (userTicketRect.contains(game.input.x, game.input.y)) {
              window.location.replace(link)
              game.input.onDown.remove(clickButton, this);

            } else if (continueRect.contains(game.input.x, game.input.y)) {
              result.visible = false
              userTicket.visible = false
              goOn.visible = false
              pausedMask.visible = false
              ticketText.visible = false
              game.paused = false
              game.input.onDown.remove(clickButton, this);
            }
          }

          game.input.onDown.add(clickOpen, this)
        } else {
          sprite.inputEnabled = false;
          var anim = sprite.animations.add(config.selfPic);
          sprite.play(config.selfPic, 40, false);
          anim.onComplete.add(this.fade, this, sprite)  
        }
    };
    this.fade = function(sprite){
        var tween = game.add.tween(sprite).to({alpha:0}, 300, 'Linear', true)
        tween.onComplete.add(this.killed, this, sprite);
    };
    this.killed = function(sprite){
        sprite.kill();
    }
  }
  states.boot = function(game) {
    this.preload = function() {
        if (typeof(GAME) !== "undefined") {
            this.load.baseURL = GAME + "/";
        }
        if (!game.device.desktop) {
            this.scale.scaleMode = Phaser.ScaleManager.EXACT_FIT;
            this.scale.forcePortrait = true;
            this.scale.refresh();
        }
    };
    this.create = function() {
        game.stage.backgroundColor = '#FFF';
        game.state.start('preload');
    };
  };
  states.preload = function(game) {
      this.preload = function(game) {
          //加载图片
          game.load.spritesheet('daojishi', imgjishi, 250,120, 4)
          game.load.image('bgPlan', bgPlan)
          game.load.image('bgRainer', bgRainer)
          game.load.spritesheet('redpacket', redpacket, 144, 173, 2)
          game.load.image('close', close)
          game.load.image('dialogExit', dialogExit)
          game.load.image('buttonExit', buttonExit)
          game.load.image('buttonCancel', buttonCancel)
          game.load.image('openRedpacket', openRedpacket)
          game.load.image('open', open)
          game.load.image('redpacketResult', redpacketResult)
          game.load.image('buttonContinue', buttonContinue)
          game.load.image('buttonUseTicket', buttonUseTicket)
          game.load.spritesheet('cursorAnimation', cursorAnimation, 74, 108, 2)
      };
      this.create = function() {
          game.state.start('main');
      };
  };
  states.main = function(game) {
      this.create = function() {
          // 物理系统
          game.physics.startSystem(Phaser.Physics.ARCADE);

          // 背景图
          var bgPlan = game.add.sprite(0, 0, 'bgPlan');
          bgPlan.width = game.width;
          bgPlan.height = game.height;

          var cursorPointer = game.add.sprite(game.world.centerX - 36, game.world.centerY + 86, 'cursorAnimation');
          var anim = cursorPointer.animations.add('cursorAnimation');
          cursorPointer.play('cursorAnimation', 2, true);

          document.getElementById('audioCountDown').play()

          // 开始游戏倒计时
          var daojishi = game.add.sprite(game.world.centerX - 140, game.world.centerY - 400, 'daojishi');
          var anim = daojishi.animations.add('daojishi');
          daojishi.play('daojishi', 1, false);
          anim.onComplete.add(this.startGame, this, daojishi);
      };
      
      this.startGame = function(daojishi){
          this.leftTime = time
          let bgRainer = game.add.sprite(0, 0, 'bgRainer');
          bgRainer.width = game.width;
          bgRainer.height = game.height;
          daojishi.visible = false;
          this.createQingLv();

          //添加按钮,并绑定事件
          let closeImg = game.add.button(rfuc(20), rfuc(20), 'close', function(){
            game.paused = true
            pausedMask.visible = true
            exitDialog.visible = true
            exitButton.visible = true
            cancelButton.visible = true

            game.input.onDown.add(buttonClick, this)
          }.bind(this))
          
          // 剩余时间
          this.leftTimeText = game.add.text(0, 0, this.leftTime, {fill: '#FFF', fontSize: '40px', fontWeight: 'bolder'})
          this.leftTimeText.scale.setTo(rfuc(1))
          this.leftTimeText.fixedToCamera = true;
          this.leftTimeText.cameraOffset.setTo(game.camera.width - rfuc(80), rfuc(20));

          let hexGraphics = new Phaser.Graphics().beginFill(0x000000, 0.5).drawRect(0,0,document.documentElement.clientWidth,document.documentElement.clientHeight + 2);
          let pausedMask = game.add.sprite(0, 0, hexGraphics.generateTexture())
          pausedMask.visible = false;

          let exitDialog = game.add.sprite(rfuc(62), rfuc(150), 'dialogExit')
          exitDialog.visible = false;

          let exitButton = game.add.button(rfuc(80), rfuc(315), 'buttonExit')
          exitButton.visible = false;

          let isExit = false
          let cancelButton = game.add.button(rfuc(200), rfuc(315), 'buttonCancel')
          cancelButton.visible = false;

          game.time.events.repeat(Phaser.Timer.SECOND, this.leftTime, this.refreshTime, this)

          let buttonClick = function() {
            let cancelRect = new Phaser.Rectangle(rfuc(200), rfuc(315), 194, 66).copyFrom(cancelButton);
            if (cancelRect.contains(game.input.x, game.input.y)) {
              game.input.onDown.remove(buttonClick, this)
              game.paused = false
              pausedMask.visible = false
              exitDialog.visible = false
              exitButton.visible = false
              cancelButton.visible = false
            }
          }
      };

      this.createQingLv = function(){
          this.qinglv = new QingLv(config, game);
          this.qinglv.init();
          this.qinglv = new QingLv(config, game);
          this.qinglv.init();
      };
      
      this.refreshTime = function(){
          this.leftTime--;
          var tem = this.leftTime;
          this.leftTimeText.text = tem;
          if(this.leftTime === 0) {
              game.paused = true;
          }
      }
  };

  //生成游戏
  let game = null
  if (game == null) {
    game = new Phaser.Game(document.documentElement.clientWidth, document.documentElement.clientHeight + 2, Phaser.AUTO, document.getElementById('gameScreen'));
    game.state.add('boot', states.boot.bind(game));
    game.state.add('preload', states.preload.bind(game));
    game.state.add('main', states.main.bind(game));
    game.state.start('boot');
  }

3. 疑難題

#1. 遊戲暫停時,點擊事件無效,需要點選,怎麼解決

#答案:  透過全域事件畫熱點的形式綁定事件,一定要記得移除事件,一定要記得

game.input.onDown.add(clickOpen, this)   //给游戏绑定全局事件

let userTicket = game.add.sprite(rfuc(78), rfuc(445), 'buttonUseTicket')        
let userTicketRect = new Phaser.Rectangle(78, 445, 194, 66).copyFrom(userTicket);  //获得button的区域

//如果点击的位置为button的位置就执行下一步
if (userTicketRect.contains(game.input.x, game.input.y)) {
　　//移除全局事件
   game.input.onDown.remove(clickButton, this);
}

 2. 文字或圖片相對於畫面居中(暫時只能做螢幕居中) 

 答: 新增文字到遊戲中,文字向左的偏移量等於遊戲畫面的寬度減去文字寬度的一般,就能達到居中的效果

ticketText = game.add.text(0, rfuc(338), '我想居中', 
{fill: '#ffe67d', fontSize: '46px', fontWeight: 'bolder'})
ticketText.left = game.world.centerX - ticketText.width / 2    //文字相对于屏幕左右居中

 程式碼位址: https://github.com/AmosXu/red-packet-rain

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