站長資訊網本篇小編為大家分享一個用html5實現的簡單貪吃蛇特效代碼，喜歡的小伙伴們可以看一下
<html> <head> <meta charset='utf-8'/> <title>Snake</title> </head> <body> <canvas id="plank" style="border"></canvas> <script type="text/javascript"> //內置大量BUG，I'm sorry. var lev=100; //定時器間隔時間 var num=30; //網格大小，現在是30x30 var direction=3; //0:up 1:down 2:left 3:right var handle; //用于管理定時器 var score=0; //分數 var pause=true; //暫停使用 var canvas = document.getElementById('plank'); var context = canvas.getContext('2d'); var snakex=new Array(); //存儲蛇身x坐標，下同 var snakey=new Array(); var prize=new Array(-1,-1); //食物的位置 function rand(){ //產生隨機數 return parseInt(Math.random()*num); } function chk(x,y){ //檢查是否結束，包括越界 if(x<0||y<0) return false; if(x>num-1||y>num-1) return false; for (var i=0; i!=snakex.length-1;i++) { if(snakex[i]==x&&snakey[i]==y) {return false;} }; return true; } function drawScore(text){ //打印分數 context.clearRect(0,0,300,25); context.fillText("Score:"+text,5,5); } function makeprize(){ //產生食物的位置 var flag=false; var prizepre=new Array(2); //使用鏈表會更好 while(!flag){ //食物位置不能在蛇體內 flag=true; prizepre[0]=rand();prizepre[1]=rand(); for (var i=0; i!=snakex.length;i++) { if((snakex[i]==prizepre[0])&&(snakey[i]==prizepre[1])) {flag=false;} } } prize=prizepre; } function runscore(x,y){ //判斷是否吃到食物，并做處理 if(prize[0]==x&&prize[1]==y){ score=score+1; drawScore(score); snakex[snakex.length]=prize[0]; snakey[snakey.length]=prize[1]; makeprize(); drawNode(prize[0],prize[1]); return true; } return false; } function run(){ //定時器用來判斷snake行進方向等等 switch(direction){ //方向 case 0: snakex[snakex.length]=snakex[snakex.length-1];snakey[snakey.length]=snakey[snakey.length-1]-1;break; case 1: snakex[snakex.length]=snakex[snakex.length-1];snakey[snakey.length]=snakey[snakey.length-1]+1;break; case 2: snakex[snakex.length]=snakex[snakex.length-1]-1;snakey[snakey.length]=snakey[snakey.length-1];break; case 3: snakex[snakex.length]=snakex[snakex.length-1]+1;snakey[snakey.length]=snakey[snakey.length-1];break; } if(!runscore(snakex[snakex.length-1],snakey[snakey.length-1])){ if(chk(snakex[snakex.length-1],snakey[snakey.length-1])==false) { clearInterval(handle); drawScore('\tGame over'); return; } drawNode(snakex[snakex.length-1],snakey[snakey.length-1]); } clearNode(snakex[0],snakey[0]); snakex.shift(); snakey.shift(); } function drawNode(x,y){ //畫點，共30X30個點（10*10像素算1個點） context.fillRect(x*10+1,y*10+31,10,10); } function clearNode(x,y){ context.clearRect(x*10+1,y*10+31,10,10); } function init(){ //初始化，設置畫布大小，啟動定時器等等 canvas.width = 510; canvas.height = 600; context.font = "normal 20px Airl"; context.textBaseline = "top"; context.fillText('P鍵開始/暫停，方向鍵控制',0,350); drawScore(''); context.strokeRect(0,30,302,302); makeprize(); drawNode(prize[0],prize[1]); snakex[0]=0;snakex[1]=1;snakex[2]=2; snakey[0]=0;snakey[1]=0;snakey[2]=0; drawNode(snakex[0],snakey[0]);drawNode(snakex[1],snakey[1]);drawNode(snakex[2],snakey[2]); } document.onkeydown=function(event){ //注冊鍵盤事件，up，down，left，right，暫停鍵p var e = event || window.event; if(e&&e.keyCode==38){ direction=0; } if(e&&e.keyCode==40){ direction=1; } if(e&&e.keyCode==37){ direction=2; } if(e&&e.keyCode==39){ direction=3; } if(e&&e.keyCode==80){ if(pause) {pause=false;handle=setInterval(run,lev);} else {pause=true;clearInterval(handle);} } } init(); </script> </body> </html>
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