<!DOCTYPE html> <html> <head><title>贪吃蛇</title> </head> <body> <canvas></canvas> <script src="https://cdn.bootcdn.net/ajax/libs/jquery/3.6.0/jquery.js"></script> <script> var canv=document.getElementById("canvas"); var ctx=canv.getContext("2d"); var score=0; //定义一个方块的构造函数 var Block=function(col,row,size) { this.col=col; this.row=row; this.size=size; }; //定义Block函数的原型方法draw； Block.prototype.draw =function() { ctx.fillRect(this.col*this.size,this.row*this.size,this.size,this.size) } //定义对象蛇 var snake ={ body:[ new Block(20,20,10), new Block(20,21,10), new Block(20,22,10) ], direction:"right", }; //定义画蛇的函数 snake.draw=function() { for(var i=0;i<this.body.length;i++) { this.body[i].draw(); } }; snake.move = function() { var head = this.body[0]; if(snake.direction=="right") { var newhead=new Block(head.col+1,head.row,head.size) } if(snake.direction =="left") { var newhead = new Block(head.col-1,head.row,head.size); } if(snake.direction=="up") { var newhead=new Block(head.col,head.row-1,head.size) } if(snake.direction=="down") { var newhead=new Block(head.col,head.row+1,head.size) } if(newhead.col<0 || newhead.col>39 ) { clearInterval(intervalId); gameover(); } if(newhead.row<0 || newhead.row>39 ) { clearInterval(intervalId); gameover(); } for(var i=0;i<this.body.length;i++) { if(this.body[i].col==newhead.col &&this.body[i].row==newhead.row) { clearInterval(intervalId); gameover(); } } this.body.unshift(newhead); if(newhead.col==apple.posX &&newhead.row==apple.posY) { score=score+100; while(true) { var checkApple =false; apple.posX=Math.floor(Math.random()*40); apple.posY=Math.floor(Math.random()*40); for(var i=0; i<this.body.length;i++) { if(this.body[i].col==apple.posX &&this.body[i].row==apple.posY) checkApple=true; } if(!checkApple) break; } } else{ this.body.pop(); } }; //创建苹果对象 var apple={ posX:Math.floor(Math.random()*40), posY:Math.floor(Math.random()*40), sizeR:5 } //画苹果函数 apple.draw=function() { ctx.fillStyle="Green"; ctx.beginPath(); ctx.arc(this.posX*10+5,this.posY*10+5,5,0,Math.PI*2,false); ctx.fill(); ctx.fillStyle="Black"; }; //结束 var gameover=function() { ctx.font="60px Comic Sans MS"; ctx.textAlign="center"; ctx.textBaseline="middle"; ctx.fillText("GAME OVER!",200,200) }; //定时功能 var intervalId=setInterval (function () { ctx.clearRect(0,0,400,400); ctx.font="20px Arial"; ctx.fillText("Score:"+score,5,15); snake.draw(); snake.move(); apple.draw(); ctx.strokeRect(0,0,400,400); },200); //贪吃蛇的按键控制 $("body").keydown(function(event) { console.log(event.keyCode); if(event.keyCode==37 &&snake.direction!="right") { snake.direction="left"; } if(event.keyCode==38 &&snake.direction!="down") { snake.direction="up"; } if(event.keyCode==39 &&snake.direction!="left") { snake.direction="right"; } if(event.keyCode==40 &&snake.direction!="up") { snake.direction="down"; } } ); </script> </body> </html>
