js编写“贪吃蛇”的小游戏_javascript技巧

*{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: px;
 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=1.22467991473532e-16, M21=-1.22467991473532e-16, M22=-1, SizingMethod='auto expand')"; /* IE6 and 7 */ filter: progid:DXImageTransform.Microsoft.Matrix( M11=-1, M12=1.22467991473532e-16, M21=-1.22467991473532e-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');
 
}