JS写的一个方块移动游戏

<script>
			//用于判定是否是开始初始化方块
			var mark = false;
			var starttime, endtime, finaltime = 0;  //记录游戏时间
			var array = new Array();  //用一个数组装所有绿色方块对象
			var timerarr = new Array();  //记录每个绿色方块 和 对应的计时器id
			
			function move(e){
				var xy = document.getElementById("xy");
				var self = document.getElementById("self");
				x = e.clientX;
				y = e.clientY;
				xy.value = "当前坐标："+x +","+y;
				if(x>=454 && x<=530 &&y>=285 && y<=355 && mark==false){
						mark = true;
						initothers(20);
				}
				target(e,x,y);
			}
			
			//线宽4px  格边长36px   target函数定位白色方块的位置
			function target(e,x,y){
				
				var self = document.getElementById("self");
				if(x>=12 && x<=855 && y>=40 &&y<=525 && mark ==true){
					self.style.left = x +'px';
					self.style.top =  y +'px';
				}
			}
			//初始化白方块位置
			function init(){
				var today = new Date();
				starttime = today.getTime();
				document.getElementById("self").style.left = 454+'px';
				document.getElementById("self").style.top = 282+'px';
			}
			//用一个对象存储绿色方块信息
			function piece(){
				piece.prototype.id = -1;   //方块编号   从0开始
				piece.prototype.dire = 0;  //移动方向   1上 2下 3左 4右
				piece.prototype.top = 0;
				piece.prototype.left = 0;
			}

			//初始化num个绿色移动方块
			function initothers(num){
				for(var i=0;i<num;i++){
					document.getElementById("pan").innerHTML += "<div id='"+i+"'; style='height:36px;width:36px;background-color:#00FF00;z-index:100; position:absolute;left:-50px'></div>";
					//num1表示从横坐标出现还是纵坐标<1表示横 >1表示纵   num2 >1表示沿着坐标轴运动  <1表示逆着坐标走
					var num1 = Math.random()*2;
					var num2 = Math.random()*2;
					var top1 = 43;   //top1表示从上向下移动  
					var top2 = 563;  //top2表示从下向上移动
					var left1 = 14;  //left1表示左-->右
					var left2 = 894;  //右-->左
					var p = new piece();
					p.id = i;
					
					if(num1<1){
						if(num2>1){  //从上往下移动
							p.dire = 2;
							p.top = top1;
							p.left = (Math.ceil(Math.random()*23)*40-26);
							document.getElementById(i).style.left = p.left+'px';
							document.getElementById(i).style.top = top1+'px';
							
						}else{   //从下往上移动
							p.dire = 1;
							p.top = top2;
							p.left = (Math.ceil(Math.random()*23)*40-26);
 							document.getElementById(i).style.left = p.left+'px';
 							document.getElementById(i).style.top = top2+'px';
 							
						}
					}else{
						//从左向右移动
						if(num2>1){
							p.dire = 4;
							p.top = (Math.ceil(Math.random()*14)*40+3);
							p.left = left1;
							document.getElementById(i).style.left = left1+'px';
							document.getElementById(i).style.top = p.top+'px';
						}else{  //右向左
							p.dire = 3;
							p.top = (Math.ceil(Math.random()*14)*40+3);
							p.left = left2;
							document.getElementById(i).style.left = left2+'px';
							document.getElementById(i).style.top = p.top+'px';
						}
					}
					array.push(p);
				}
				
				//初始化完成  触发移动
				var n;
				for(n in array){
					go(n,array[n].id,array[n].dire);
				}
			}
			
			//重新定位一个绿色方块location
				function location(timerid,i,n,p){
					
					clearInterval(timerarr[timerid]);
					//alert(timerarr[timerid]);
					var num1 = Math.random()*2;
					var num2 = Math.random()*2;
					var top1 = 43;   
					var top2 = 563;  
					var left1 = 14; 
					var left2 = 894; 
					
					if(num1<1){
						if(num2>1){ 
							p.dire = 2;
							p.top = top1;
							p.left = (Math.ceil(Math.random()*23)*40-26);
							document.getElementById(i).style.left = p.left+'px';
							document.getElementById(i).style.top = top1+'px';
						}else{  
							p.dire = 1;
							p.top = top2;
							p.left = (Math.ceil(Math.random()*23)*40-26);
 							document.getElementById(i).style.left = p.left+'px';
 							document.getElementById(i).style.top = top2+'px';
						}
					}else{
						if(num2>1){
							p.dire = 4;
							p.top = (Math.ceil(Math.random()*14)*40+3);
							p.left = left1;
							document.getElementById(i).style.left = left1+'px';
							document.getElementById(i).style.top = p.top+'px';
						}else{  
							p.dire = 3;
							p.top = (Math.ceil(Math.random()*14)*40+3);
							p.left = left2;
							document.getElementById(i).style.left = left2+'px';
							document.getElementById(i).style.top = p.top+'px';
						}
					}
					go(n,p.id,p.dire);
			}
		    
			//绿色方块按规律直线移动
			   function go(n,i,dire){
			   	//当一个绿色方块出界  重新初始化一个进入界面
				var speed = Math.ceil(Math.random()*3)*10+10;  //速度随机
				
				if(dire==2){
						timerarr[i] = setInterval("array["+n+"].top>=565 ? location("+i+","+i+","+n+",array["+n+"]): array["+n+"].top+=8;document.getElementById("+i+").style.top = array["+n+"].top+'px'; check(array["+i+"])",speed);
					}
				if(dire==1){
						timerarr[i] = setInterval("array["+n+"].top<=41 ? location("+i+","+i+","+n+",array["+n+"]): array["+n+"].top-=8;document.getElementById("+i+").style.top = array["+n+"].top+'px';check(array["+i+"])",speed);
					}
				if(dire==4){
						timerarr[i] = setInterval("array["+n+"].left>=896 ? location("+i+","+i+","+n+",array["+n+"]): array["+n+"].left+=8;document.getElementById("+i+").style.left = array["+n+"].left+'px';check(array["+i+"])",speed);
					}
				if(dire==3){
						timerarr[i] = setInterval("array["+n+"].left<12 ? location("+i+","+i+","+n+",array["+n+"]): array["+n+"].left-=8;document.getElementById("+i+").style.left = array["+n+"].left+'px';check(array["+i+"])",speed);
					}
			} 
			
			//检查是否与白色方块相撞  传入绿色方块的对象进行判断
			function check(t){
				if(t.left<=x+75 && t.left>=x-36 && t.top<=y+75 && t.top>=y-36){
					var today = new Date();
					endtime = today.getTime();
					finaltime = (endtime - starttime - 0) / 1000;
					window.alert('游戏结束！你坚持了 ' + finaltime + ' 秒…');
					//alert('鼠标坐标'+x+','+y+'  方块坐标'+t.left+','+t.top);
					//重新载入页面
					document.location.reload();   
				}
			}
		</script>

<body onload="init();">
		<input id ="xy" disabled=true/>
		<!--<button id="self" style="position:relative;">ssss</button> -->
		<div id="pan" style=" height: 565; width: 925; background-image:url(http://dl.iteye.com/upload/picture/pic/97696/26d1caeb-c0ca-38e2-87ce-56e862235a79.jpg);background-repeat:no-repeat;" onmousemove="move(event)">
			<div id="self" style="height:76px;width:76px; background-color: white; position:absolute;border-width:1px; border-style:solid;border-color: red;"></div>
		</div>
		
	</body>