仿flash的html5网页躲避游戏


html5 躲避游戏，仿一个flash的avoid game，小小的网页游戏代码，不这HTML5不支持目前主流的IE8，请使用IE9或火狐、Chrome或Opera等浏览器查看效果。游戏玩法，用键盘控制下边的蓝色方块来躲避快速落下的方块，如果不小心被碰上则游戏结束，考察反应能力。

答案：<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8" />
<title>仿flash的html5躲避游戏，avoid game代码</title>
</head>
<body>
<canvas id="cv"></canvas>
<script>
var cv = document.getElementById('cv'),
	ctx = cv.getContext('2d');
	w = 1000;
	h = 800;	
	cv.width = w;
	cv.height = h;	
	var paintCv = function(){
	ctx.fillStyle = 'black';
	ctx.fillRect(0, 0, w, h)
	}	
			var size = 20,
				playerX = w/size/2,
				playerY = h/size -1,
				speed = 30,
				gameLoop = null,
				elemyArr = [],
				elemyNum = 50,
				score = 0;
			
			var paintPlayer = function(){
				ctx.fillStyle = 'blue';
				ctx.fillRect(playerX * size, playerY * size, size, size);
			}
			
			var update = function(){
				if(playerX >= w/size-1){
					playerX = w/size-1;
				} else if(playerX <= 0){
					playerX = 0;
				} else if(playerY >= h/size-1){
					playerY = h/size-1;
				} else if(playerY <= 0){
					playerY = 0;
				}
				
				for(var i=0; i<elemyNum; i++){
					elemyArr[i].y++;
					if(elemyArr[i].y >= h/size){
						elemyArr.splice(i, 1);
						var x = Math.round(Math.random() * w/size);
						var y = Math.round(Math.random() * -h/size);
						elemyArr.push({'x':x,'y':y});
						score++;
					}
					
					if(elemyArr[i].x == playerX && elemyArr[i].y == playerY){
						alert('GAME OVER! Score:' + score)
						score = 0;
					}
				}
			}
			
			var paintElemy = function(){
				for(var i=0; i<elemyNum; i++){
					ctx.fillStyle = 'white';
					ctx.fillRect(elemyArr[i].x * size, elemyArr[i].y * size, size, size);
				}
			}
			
			var draw = function(){
				paintCv();
				paintPlayer();
				paintElemy();
				update();
			}
			
			var init = function(){
				document.onkeydown = function(e){
					var code = e.keyCode;
					if(code == 37)playerX -= 1;
					if(code == 38)playerY -= 1;
					if(code == 39)playerX += 1;
					if(code == 40)playerY += 1;
				}
				
				for(var i=0; i<elemyNum; i++){
					var x = Math.round(Math.random() * w/size);
					var y = Math.round(Math.random() * -h/size);
					elemyArr.push({'x':x,'y':y})
				}
				
				gameLoop = setInterval(draw, 1000/speed)
			}
			
			init();
			
		</script>
	</body>
</html>

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