JS mini game Fairy Sword Flop source code detailed explanation_javascript skills

/** 仙剑翻牌游戏
*  Date:  2013-02-24
*  Author: fdipzone
*  Ver   1.0
*/
window.onload = function(){
  var gameimg = [
          'images/start.png', 
          'images/success.png',
          'images/fail.png',
          'images/clear.png',
          'images/cardbg.jpg',
          'images/sword.png'
         ];

  for(var i=1; i<=card.get_total(); i++){
    gameimg.push('images/card' + i + '.jpg');
  }

  var callback = function(){
    card.init();
  }

  img_preload(gameimg, callback);
}

/** card class */
var card = (function(total,cardnum){

  var gametime = [0,65,60,55,50,45,40,35,30,25,20]; // 每关的游戏时间
  var turntime = 8;                 // 观看牌时间
  var level = 1;                  // 当前关卡
  var carddata = [];                // 记录牌的数据
  var leveldata = [];                // 当前关卡牌数据
  var is_lock = 0;                 // 是否锁定
  var is_over = 0;                 // 游戏结束
  var first = -1;                  // 第一次翻开的卡
  var matchnum = 0;                 // 配对成功次数

  // 初始化
  init = function(){
    tips('show');
    $('startgame').onclick = function(){
      tips('hide');
      start();
    }
  }

  // 开始游戏
  start = function(){
    reset();
    create(cardnum);
    show();

    var curtime = turntime;

    setHtml('livetime', curtime);
    
    var et = setInterval(function(){
      if(curtime==0){
        clearInterval(et);
        turnall();
        set_event();
        message('start', process);
        return ;
      }

      if(curtime==turntime){
        turnall();
      }

      curtime--;
      setHtml('livetime', curtime);
    }, 1000)
  }

  // 随机抽取N张牌
  create = function(n){
    carddata = [];
    leveldata = [];
    
    // 创建所有牌
    for(var i=1; i<=total; i++){
      carddata.push(i);
    }
  
    // 抽取牌
    for(var i=0; i<n; i++){
      var curcard = carddata.splice(Math.random()*carddata.length, 1).pop();
      leveldata.push({'cardno':curcard,'turn':0}, {'cardno':curcard,'turn':0});
    }

    // 生成随机顺序游戏牌
    leveldata = shuffle(leveldata);
  }

  // 生成牌
  show = function(){
    var cardhtml = '';
    for(var i=0; i<leveldata.length; i++){
      cardhtml += '<div class="cardplane">';
      cardhtml += '<div class="card viewport-flip" id="card' + i + '">';
      cardhtml += '<div class="list flip out"><img src="images/card' + leveldata[i]['cardno'] + '.jpg"></div>';
      cardhtml += '<div class="list flip"><img src="images/cardbg.jpg"></div>';
      cardhtml += '</div>';
      cardhtml += '</div>';

    }
    setHtml('gameplane', cardhtml);
  }

  // 全部翻转
  turnall = function(){
    for(var i=0; i<leveldata.length; i++){
      turn_animate(i);
    }
  }

  // 翻转动画
  turn_animate = function(key){
    var obj = $_tag('div', 'card' + key);
    var cardfont, cardback;
    
    if(getClass(obj[0]).indexOf('out')!=-1){
      cardfont = obj[0];
      cardback = obj[1];
    }else{
      cardfont = obj[1];
      cardback = obj[0];
    }

    setClass(cardback, 'list flip out');
    var et = setTimeout(function(){
      setClass(cardfont, 'list flip in');
    }, 225);
  }

  // 设置点击事件
  set_event = function(){
    var o = $_tag('div', 'gameplane');
    for(var i=0,count=o.length; i<count; i++){
      if(getClass(o[i])=='card viewport-flip'){
        o[i].onclick = function(){
          turn(this.id);
        }
      }
    }
  }

  // 计时开始
  process = function(){

    is_lock = 0;

    var curtime = gametime[level];
    setHtml('livetime', curtime);

    var et = setInterval(function(){
      if(matchnum==cardnum){
        clearInterval(et);
        return ;
      }
      curtime--;
      setHtml('livetime', curtime);
      
      if(curtime==0){
        clearInterval(et);
        is_over = 1;
        message('fail', start);
      }

    }, 1000);
  }


  // 游戏讯息动画
  message = function(type, callback){

    is_lock = 1;

    var message = $('message');
    var processed = 0;
    var opacity = 0;
    var soundtime = {
          'start': 1500,
          'success': 4000,
          'fail': 6000,
          'clear': 4000
    };

    disp('message','show');
    setClass(message,'message_' + type);
    setOpacity(message, opacity);
    setPosition(message, 'left', 0);
    setPosition(message, 'top', 390);

    if(type=='start'){
      bgsound(type, true);
    }else{
      bgsound(type);
    }

    var et = setInterval(function(){
      var message_left = getPosition(message,'left');
      processed = processed + 25;

      if(processed>=500 && processed<=750){
        opacity = opacity+10;
        setPosition(message, 'left', message_left + 30);
        setOpacity(message, opacity);
      }else if(processed>=soundtime[type] && processed<=soundtime[type]+250){
        opacity = opacity-10;
        setPosition(message, 'left', message_left + 35);
        setOpacity(message, opacity);
      }else if(processed>soundtime[type]+250){
        disp('message','hide');
        clearInterval(et);
        if(typeof(callback)!='undefined'){
          callback();
        }
      }
    },25);
  }

  // 翻牌
  turn = function(id){
    if(is_lock==1){
      return ;
    }

    var key = parseInt(id.replace('card',''));
  
    if(leveldata[key]['turn']==0){ // 未翻开
      if(first==-1){ // 第一次翻
        turn_animate(key);
        first = key;
        leveldata[key]['turn'] = 1;
      }else{ // 第二次翻
        turn_animate(key);
        leveldata[key]['turn'] = 1;
        check_turn(key);
      }
    }
  }

  // 检查是否翻牌成功
  check_turn = function(key){
    is_lock = 1;

    if(leveldata[first]['cardno']==leveldata[key]['cardno']){ // 配对成功
      matchnum ++;

      if(matchnum==cardnum){
        var et = setTimeout(function(){
          message('success', levelup);
        }, 225);
      }
      first = -1;
      is_lock = 0;

    }else{ // 配对失败,将翻开的牌翻转

      var et = setTimeout(function(){
          turn_animate(first);
          leveldata[first]['turn'] = 0;
          turn_animate(key);
          leveldata[key]['turn'] = 0;

          first = -1;
          
          if(is_over==0){
            is_lock = 0;
          }
        }, 300);
    }
  }

  // 过关
  levelup = function(){
    if(level<gametime.length-1){
      level ++;
      setHtml('level', level);
      start();
    }else{
      clear();
    }
  }

  // 全部通关
  clear = function(){
    level = 1;
    disp('levelplane','hide');
    disp('process', 'hide');
    setHtml('gameplane','');
    message('clear',init);
  }

  // 音乐播放
  bgsound = function(file, loop){
    var id = 'audioplayer';

    if(typeof(file)!='undefined'){
      if(typeof(loop)=='undefined'){
        loop = false;
      }

      var audiofile = [];
      audiofile['mp3'] = 'music/' + file + '.mp3';
      audiofile['ogg'] = 'music/' + file + '.ogg';
      audioplayer(id, audiofile, loop);
    }else{
      audioplayer(id);
    }
  }

  // 游戏玩法
  tips = function(type){
    disp('tips', type);
  }

  // 获取牌总数
  get_total = function(){
    return total;
  }

  // 重置参数
  reset = function(){
    disp('levelplane','show');
    setHtml('level', level);
    disp('process', 'show');
    setHtml('livetime', '');
    setHtml('gameplane', '');
    is_lock = 1;
    is_over = 0;
    first = -1;
    matchnum = 0;
  }

  return this;

})(42,9);