js编写“贪吃蛇”的小游戏_javascript技巧

        
  
 
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*{padding: 0px; margin: 0px;font-size: 12px} body{background: #ccc} input.button{ width: 60px; cursor: pointer; } #info{ width: 540px; height: 30px; margin: 30px auto 5px; line-height: 30px; } #score{ width: 73px; height: 28px; padding-left: 64px; background: url(./images/score.png) no-repeat; float: left; font-size: 14px; font-weight: 700; font-style:italic; font-family: '微软雅黑'; } #form{ float: right; } #form input{ vertical-align: middle; margin-right: 5px; } #main{ width: 540px; height: 500px; margin: 0 auto; position: relative; /*background: #71a000*/ } #main div{ width: 20px; height: 20px; position: absolute; } #main #home{ width: 500px; height: 460px; left: 20px; top: 20px; position: relative; background: url(./images/background.jpg) no-repeat; } #main #home div{ position: absolute; } #main div.wall{ width: 540px; height: 20px; background: url("./images/div.jpg") repeat-x; position: absolute; } #main div.top{ left:0px; top:0px; } #main div.bottom{ left:0px; top:480px; } #main div.left{ width: 20px; height: 500px; background: url(./images/div.jpg) repeat-y; left:0px; top:0px; } #main div.right{ width: 20px; height: 500px; background: url(./images/div.jpg) repeat-y; left:520px; top:0px; } .l{ -moz-transform:rotate(0deg); -o-transform:rotate(0deg); -webkit-transform:rotate(0deg); transform:rotate(0deg); /* IE8+ - must be on one line, unfortunately */ -ms-filter: "progid:DXImageTransform.Microsoft.Matrix(M11=1, M12=0, M21=0, M22=1, SizingMethod='auto expand')"; /* IE6 and 7 */ filter: progid:DXImageTransform.Microsoft.Matrix( M11=1, M12=0, M21=0, M22=1, SizingMethod='auto expand'); } .t{ -moz-transform: rotate(90deg); -o-transform: rotate(90deg); -webkit-transform: rotate(90deg); transform: rotate(90deg); /* IE8+ - must be on one line, unfortunately */ -ms-filter: "progid:DXImageTransform.Microsoft.Matrix(M11=-1.8369701987210297e-16, M12=-1, M21=1, M22=-1.8369701987210297e-16, SizingMethod='auto expand')"; /* IE6 and 7 */ filter: progid:DXImageTransform.Microsoft.Matrix( M11=-1.8369701987210297e-16, M12=-1, M21=1, M22=-1.8369701987210297e-16, SizingMethod='auto expand'); } .r{ -moz-transform: rotate(180deg); -o-transform: rotate(180deg); -webkit-transform: rotate(180deg); transform: rotate(180deg); /* IE8+ - must be on one line, unfortunately */ -ms-filter: "progid:DXImageTransform.Microsoft.Matrix(M11=-1, M12=1.2246467991473532e-16, M21=-1.2246467991473532e-16, M22=-1, SizingMethod='auto expand')"; /* IE6 and 7 */ filter: progid:DXImageTransform.Microsoft.Matrix( M11=-1, M12=1.2246467991473532e-16, M21=-1.2246467991473532e-16, M22=-1, SizingMethod='auto expand'); } .b{ -moz-transform: rotate(270deg); -o-transform: rotate(270deg); -webkit-transform: rotate(270deg); transform: rotate(270deg); /* IE8+ - must be on one line, unfortunately */ -ms-filter: "progid:DXImageTransform.Microsoft.Matrix(M11=6.123233995736766e-17, M12=1, M21=-1, M22=6.123233995736766e-17, SizingMethod='auto expand')"; /* IE6 and 7 */ filter: progid:DXImageTransform.Microsoft.Matrix( M11=6.123233995736766e-17, M12=1, M21=-1, M22=6.123233995736766e-17, SizingMethod='auto expand'); }

var home = $('#home'); var snakeArr = []; var direcation = 'l'; var speed = 0; var timer = ''; //460/20 var rows = 23; var cols = 25; var die = false; //用于判断是否game over var food = []; var sorce = 0; //得分的显示

for( var i=0; i<4; i++ ){ //var snakeDiv = document.createElement("div"); //snakeDiv.style = 'background:url(./images/snake' + i + '.png) no-repeat;'; var snakeDiv = $('
'); home.append(snakeDiv); snakeArr[i] = {r : 10, c : 10 + i, div : snakeDiv, d : direcation}; setPosition(snakeArr[i]); }

function move(){ var timer = setInterval(function(){ for( var i=snakeArr.length -1; i>0; i-- ){ snakeArr[i].c = snakeArr[i-1].c; snakeArr[i].r = snakeArr[i-1].r; snakeArr[i].d = snakeArr[i-1].d; } switch(direcation){ case 'l' : snakeArr[0].c--; snakeArr[0].d = 'l'; break; case 'r' : snakeArr[0].c++; snakeArr[0].d = 'r'; break; case 't' : snakeArr[0].r--; snakeArr[0].d = 't'; break; case 'b' : snakeArr[0].r++; snakeArr[0].d = 'b'; break; } //snake的方向控制 $(window).keydown(function(event){ switch(event.keyCode){ case 37 : direcation = 'l'; break; case 38 : direcation = 't'; break; case 39 : direcation = 'r'; break; case 40 : direcation = 'b'; break; } }); //snake事故 //1. snake撞墙 if( snakeArr[0].c < 0 || snakeArr[0].r < 0 || snakeArr[0].c >= cols || snakeArr[0].r >= rows ){ clearInterval(timer); die = true; alert('GAME OVER'); } //2. snake撞到自己 for( var i=1; i
         

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function createFood(){ var r = parseInt(rows * Math.random()); var c = parseInt(cols * Math.random()); var casrsh = false; //2个水果出现的位置不能一样 while( food.length == 0 ){ //判断snake的位置，不能与snake相撞 for( var i = 0; i < snakeArr.length; i++ ){ if( r == snakeArr[i].r && c == snakeArr[i].c ){ casrsh = true; } } //当位置不重叠的时候，产生水果 if( !casrsh ){ var i = parseInt(4 * Math.random()); var foodDiv = $('
'); home.append(foodDiv); food.push({r : r, c : c, div : foodDiv}); setPosition(food[0]); } } }

function setPosition(obj){ obj.div.css({left : obj.c * 20, top : obj.r * 20}); obj.div.removeClass().addClass(obj.d); } createFood(); //那页面一被加载出来就显示出食物！