JS小游戏之极速快跑源码详解

/** 极速快跑* Author: fdipzone* Date: 2012-07-15* Ver: 1.0*/var gameimg = ['images/start.png', 'images/start_over.png', 'images/go.png', 'images/go_over.png', 'images/running.gif', 'images/run_start1.gif', 'images/run_start2.gif', 'images/run_start3.gif'];var speed_obj = new SpeedClass();window.onload = function(){ var callback = function(){ speed_obj.init(); } img_preload(gameimg, callback);}// Speed Classfunction SpeedClass(){ this.levelset = [8,5,8,12]; // 难度参数 this.playerlist = null; // 选手列表 this.player = 0;  // 选中的选手 this.level = 2;  // 难度 this.lock = 0;  // 锁定 this.isstart = 0;  // 是否开始 this.isover = 0;  // 是否结束}// initSpeedClass.prototype.init = function(){ this.reset(); this.create_player(); this.create_event();}// resetSpeedClass.prototype.reset = function(){ this.player = 0; this.level = $('level').value; // level this.playerlist = $_tag('li', 'playerlist'); for(var i=0; i<this.playerlist.length; i++){ this.playerlist[i].className = ''; } disp('start_btn', 'show', 'start_btn'); disp('go_btn', 'hide', 'go_btn'); this.lock = 0; // unlock this.isstart = 0; // unstart this.isover = 0; // unover}// create playerSpeedClass.prototype.create_player = function(){ var runway = []; var playerlist = []; for(var i=1; i<=8; i++){ runway[i] = '<li><div id="player' + (9-i) + '" class="run_status1"></div></li>'; playerlist[i] = '<li>' + i + '</li>'; } $('runway').innerHTML = runway.join(''); $('playerlist').innerHTML = playerlist.join(''); runway = null; playerlist = null;}// create eventSpeedClass.prototype.create_event = function(){ var self = this; this.playerlist = $_tag('li', 'playerlist'); for(var i=0; i<this.playerlist.length; i++){ this.playerlist[i].onmouseover = function(){  if(this.className!='on'){  this.className = 'over';  } } this.playerlist[i].onmouseout = function(){  if(this.className!='on'){  this.className = '';  } } this.playerlist[i].onclick = function(o,c){  return function(){  if(self.lock==0){   o.playerlist[c].className = 'on';   if(o.player!=0 && o.player!=c+1){ // 不等於0且不等於自己   o.playerlist[o.player-1].className = '';   }   o.player = c + 1;  }  } }(self, i); } $('start_btn').onmouseover = function(){ this.className = 'start_over_btn'; } $('start_btn').onmouseout = function(){ this.className = 'start_btn'; } $('start_btn').onclick = function(){ if(self.player==0){  return alert('请选择要支持的选手'); }else{  self.lock = 1; // locked  disp('start_btn','hide');  disp('go_btn','show');  for(var i=1; i<=8; i++){  self.start(i);  } } } $('go_btn').onmouseover = function(){ this.className = 'go_over_btn';  } $('go_btn').onmouseout = function(){ this.className = 'go_btn'; } $('go_btn').onclick = function(){ self.go(); }}// start gameSpeedClass.prototype.start = function(c){ var o = $('player' + c); var step = 1; var self = this; var exert = 0; o.style.marginLeft = '62px'; // init  var et = setInterval(function(){ if(step<4){ // step 1-3 is ready  o.className = 'run_status' + step; }else{  // run  if(o.className!='running'){  o.className = 'running';  }  // start can go  if(self.isstart==0){  self.isstart = 1;  }  // 已有一名选手到达终点  if(self.isover==1){  clearInterval(et);  }else{  if(self.player!=c){ // 其他选手   exert = Math.floor(Math.random()* self.levelset[self.level])+3; // 根据level调整  }  o.style.marginLeft = parseInt(o.style.marginLeft) + Math.floor(Math.random()*8)+4 + exert + 'px';  // 到达终点  if(parseInt(o.style.marginLeft)>=745){    clearInterval(et);   self.isover = 1;   self.gameover(o.id);  }  } } step ++; }, 350)}// goSpeedClass.prototype.go = function(){ if(this.isstart==1 && this.isover==0){ var o = $('player' + this.player); var exert = Math.floor(Math.random()*3)+2; // 2-5 o.style.marginLeft = parseInt(o.style.marginLeft) + exert + 'px'; } return false;}// gameoverSpeedClass.prototype.gameover = function(id){ id = id.replace('player',''); var self = this; var msg = ''; if(id==this.player){ msg = "恭喜你,你支持的选手获得胜利/n/n"; }else{ msg = "很遗憾,你支持的选手没有获得胜利,获胜的是" + id + "号选/n/n"; } if(confirm(msg + '是否重新开始?')==true){ setTimeout(function(){  self.init(); },1000); }else{ return false; }}/** common function */// get document.getElementBy(id)function $(id){ this.id = id; return document.getElementById(id);}// get document.getElementsByTagNamefunction $_tag(name, id){ if(typeof(id)!='undefined'){ return $(id).getElementsByTagName(name); }else{ return document.getElementsByTagName(name);  }}/* div show and hide* @param id dom id* @param handle show or hide* @param classname*/function disp(id, handle, classname){ if(handle=='show'){ $(id).style.display = 'block'; }else{ $(id).style.display = 'none';  } if(typeof(classname)!='undefined'){ $(id).className = classname; }}/* img preload* @param img 要加载的图片数组* @param callback 图片加载成功后回调方法*/function img_preload(img, callback){ var onload_img = 0; var tmp_img = []; for(var i=0,imgnum=img.length; i<imgnum; i++){ tmp_img[i] = new Image(); tmp_img[i].src = img[i]; if(tmp_img[i].complete){  onload_img ++; }else{  tmp_img[i].onload = function(){  onload_img ++;  } } } var et = setInterval( function(){  if(onload_img==img.length){ // 定时器,判断图片完全加载后调用callback  clearInterval(et);  callback();  } },200);}