How to implement a guessing game using JavaScript (detailed tutorial)

 
 
 
 
 
 
  

    

      

        
我：name
        

      
      

        
电脑：name
        

      
    
    

      开始
    
    
请开始游戏...
    

      

        
石头
      
      

        
剪刀
      
      

        
布
      
    
  

  
 

*{
  margin:0px;
  padding:0px;
  font-family:'迷你简卡通';
  font-size:28px;
}
html,body{
  width:100%;
  height:100%;
  background:rgba(244, 184, 202, 1);
}
ul{
  list-style:none;
}
#game{
  width:800px;
  height:600px;
  margin:auto;
  top:20%;
}
#game ul{
  width:100%;
  height:415px;
}
#game ul li{
  width:50%;
  height:100%;
  float:left;
  text-align:center;
}
#game ul li .anim{
  width:223px;
  height:337px;
  border:10px solid #ff6699;
  border-radius:50%;
  margin:20px auto 0;
  background-position:center;
  background-repeat:no-repeat;
}
.user{
  background:url('../img/readyl.png');
}
.comp{
  background:url('../img/readyr.png');
}
#game .op{
  width:100%;
  text-align:center;
}
#game .op button{
  width:200px;
  height:60px;
  border:10px solid #ff6699;
  background:rgb(253, 217, 227);
  border-radius:50%;
  outline:none;
  cursor:pointer;
  font-weight:bold;
}
#game .op button:hover{
  border-color:#ff0000;
  background-color:#ff0000;
  font-size:36px;
  color:rgb(253, 217, 227);
}
#game .op button.disabled{
  border-color:#bbb;
  color:#bbb;
  background-color:#ccc;
  font-size:28px;
  cursor:default;
}
#game .guess{
  width:220px;
  height:100%;
  position:fixed;
  top:0px;
  left:0px;
  display:none;
}
#game ul.guess li{
  width:100%;
  height:32%;
}
#game ul.guess li p{
  width:100%;
  height:90%;
  border:10px solid #ff6699;
  border-radius:50%;
  background-position:center;
  background-repeat:no-repeat;
  cursor:pointer;
  background-color:rgba(244, 184, 202, 1);
}
#game ul.guess li p:hover{
  background-color:#ff6699;
  color:#fff;
}
p.guess0{
  background-image:url('../img/0.png');
}
p.guess1{
  background-image:url('../img/1.png');
}
p.guess2{
  background-image:url('../img/2.png');
}
#game p.text{
  margin-top:20px;
  text-align:center;
  font-size:50px;
  font-weight:bold;
}

Function.prototype.extend = function( fn ){
    for( var attr in fn.prototype ){
      this.prototype[attr] = fn.prototype[attr];
    }
}
//父级构造函数用于继承,共有属性
function Caiquan( name ){
  this.name = name;
  this.point = 0;
}
//用于继承下面衍生，共有方法
Caiquan.prototype.guess = function(){}
//继承父，玩家的构造函数
function User( name ){
  Caiquan.call(this,name);
}
User.extend( Caiquan );
User.prototype.guess = function( point ){
  return this.point = point;
}
//电脑的构造函数
function Comp( name ){
  Caiquan.call(this,name);
}
Comp.extend( Caiquan ) ;
//电脑的猜拳方法，随机
Comp.prototype.guess = function(){
  return this.point = Math.floor( Math.random()*3 );
}
//裁判构造函数
function Game( u , c ){
  this.text = document.getElementById('text');
  this.btn = document.getElementById("play");
  this.user = u;
  this.comp = c;
  this.classN =document.getElementsByClassName('name');
  this.guess = document.getElementById("guess");
  this.anim = document.getElementsByClassName("anim");
  this.num = 0;
  this.init();
  this.tiemr = null;
}
Game.prototype.Caiquan = function(){
  this.textValue( '请出拳...' );
  this.BtnDisable();
  this.start();
  this.guess.style.display = 'block';
}
//怎么玩
Game.prototype.start = function(){
  var This = this;
  this.timer = setInterval(function(){
    This.anim[0].className = 'anim user guess' +( ( This.num ++ ) % 3 );
    This.anim[1].className = 'anim comp guess' + ( ( This.num ++ ) % 3 ) ;
  },500)
}
//初始化名字
Game.prototype.init = function(){
  this.classN[0].innerHTML = '我:' + this.user.name;
  this.classN[1].innerHTML = '电脑:' + this.comp.name;
}
//提示面板区域的修改
Game.prototype.textValue = function( val ){
  this.text.innerHTML = val;
}
//按钮失效
Game.prototype.BtnDisable = function(){
  if( this.btn.disabled ){
    this.btn.disabled = false;
    this.btn.className ='';
    this.btn.innerHTML = '再来一次'
  }else{
    this.btn.disabled = true;
    this.btn.className ='disabled';
  }
}
Game.prototype.verdict = function( point ){
  clearInterval(this.timer);
  var userGu = user.guess(point);
  var compGu = comp.guess();
  this.anim[0].className = 'anim user guess' + userGu;
  this.anim[1].className = 'anim comp guess' + compGu;
  var res = userGu - compGu;
  switch (res){
    case 0:
    this.textValue('平局!!!')
      break;
    case 1:
    case -2:
    this.textValue('lose~~~');
    break;
    case 2:
    case -1:
    this.textValue('win!!!')
      break;
  }
  this.guess.style.display = 'none';
  this.BtnDisable();
}
var user = new User( '锐雯' );
var comp = new Comp( '拉克丝' );
var game = new Game( user , comp );