本文实例讲述了JavaScript实现简洁的俄罗斯方块。分享给大家供大家参考，具体如下：
先来看看运行效果图：
完整实例代码如下：
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>俄罗斯方块</title>
<style type="text/css">
.c{margin:1px; width:19px; height:19px; background:red; position:absolute;}
.d{margin:1px; width:19px; height:19px; background:gray; position:absolute;}
.f{top:0px; left:0px; background:black; position:absolute;}
.e{top:0px; background:#151515; position:absolute;}
.g{width:100px; height:20px; color:white; position:absolute;}
</style>
<script type="text/javascript">
var row = 18;
var col = 10;
var announcement = 6;
var size = 20;
var isOver = false;
var shapes = ("0,1,1,1,2,1,3,1;1,0,1,1,1,2,2,2;2,0,2,1,2,2,1,2;0,1,1,1,1,2,2,2;1,2,2,2,2,1,3,1;1,1,2,1,1,2,2,2;0,2,1,2,1,1,2,2").split(";");
var tetris;
var container;
function createElm(tag,css)
{
var elm = document.createElement(tag);
elm.className = css;
document.body.appendChild(elm);
return elm;
}
function Tetris(css,x,y,shape)
{
// 创建4个div用来组合出各种方块
var myCss = css?css:"c";
this.divs = [createElm("div",myCss),createElm("div",myCss),createElm("div",myCss),createElm("div",myCss)];
if(!shape)
{
this.divs2 = [createElm("div",myCss),createElm("div",myCss),createElm("div",myCss),createElm("div",myCss)];
this.score = createElm("div","g");
this.score.style.top = 10*size+"px";
this.score.style.left = (col- -1)*size+"px";
this.score.innerHTML = "score:0";
}
this.container = null;
this.refresh = function()
{
this.x = (typeof(x)!='undefined')?x:3;
this.y = (typeof(y)!='undefined')?y:0;
// 如果有传参，优先使用参数的，如果有预告，优先使用预告，都没有就自己生成
if(shape)
this.shape = shape;
else if(this.shape2)
this.shape = this.shape2;
else
this.shape = shape?shape:shapes[Math.floor((Math.random()*shapes.length-0.000000001))].split(",");
this.shape2 = shapes[Math.floor((Math.random()*shapes.length-0.000000001))].split(",");
if(this.container && !this.container.check(this.x,this.y,this.shape))
{
isOver = true;
alert("游戏结束");
}
else
{
this.show();
this.showScore();
this.showAnnouncement();
}
}
// 显示方块
this.show = function()
{
for(var i in this.divs)
{
this.divs[i].style.top = (this.shape[i*2+1]- -this.y)*size+"px";
this.divs[i].style.left = (this.shape[i*2]- -this.x)*size+"px";
}
}
// 显示预告
this.showAnnouncement = function()
{
for(var i in this.divs2)
{
this.divs2[i].style.top = (this.shape2[i*2+1]- -1)*size+"px";
this.divs2[i].style.left = (this.shape2[i*2]- -1- -col)*size+"px";
}
}
// 显示分数
this.showScore = function()
{
if(this.container && this.score)
{
this.score.innerHTML = "score:" + this.container.score;
}
}
// 水平移动方块的位置
this.hMove = function(step)
{
if(this.container.check(this.x- -step,this.y,this.shape))
{
this.x += step;
this.show();
}
}
// 垂直移动方块位置
this.vMove = function(step)
{
if(this.container.check(this.x,this.y- -step,this.shape))
{
this.y += step;
this.show();
}
else
{
this.container.fixShape(this.x,this.y,this.shape);
this.container.findFull();
this.refresh();
}
}
// 旋转方块
this.rotate = function()
{
var newShape = [this.shape[1],3-this.shape[0],this.shape[3],3-this.shape[2],this.shape[5],3-this.shape[4],this.shape[7],3-this.shape[6]];
if(this.container.check(this.x,this.y,newShape))
{
this.shape = newShape;
this.show();
}
}
this.refresh();
}
function Container()
{
this.init = function()
{
// 绘制方块所在区域
var bgDiv = createElm("div","f");
bgDiv.style.width = size*col+"px";
bgDiv.style.height = size*row+"px";
// 绘制预告所在区域
var bgDiv = createElm("div","e");
bgDiv.style.left = size*col+"px";
bgDiv.style.width = size*announcement+"px";
bgDiv.style.height = size*row+"px";
// 清空积分
this.score = 0;
}
this.check = function(x,y,shape)
{
// 检查边界越界
var flag = false;
var leftmost=col;
var rightmost=0;
var undermost=0;
for(var i=0;i<8;i+=2)
{
// 记录最左边水平坐标
if(shape[i]<leftmost)
leftmost = shape[i];
// 记录最右边水平坐标
if(shape[i]>rightmost)
rightmost = shape[i];
// 记录最下边垂直坐标
if(shape[i+1]>undermost)
undermost = shape[i+1];
// 判断是否碰撞
if(this[(shape[i+1]- -y)*100- -(shape[i]- -x)])
flag = true;
}
// 判断是否到达极限高度
for(var m=0;m<3;m++)
for(var n=0;n<col;n++)
if(this[m*100+n])
flag = true;
if((rightmost- -x+1)>col || (leftmost- -x)<0 || (undermost- -y+1)>row || flag)
return false;
return true;
}
// 用灰色方块替换红色方块，并在容器中记录灰色方块的位置
this.fixShape = function(x,y,shape)
{
var t = new Tetris("d",x,y,shape);
for(var i=0;i<8;i+=2)
this[(shape[i+1]- -y)*100- -(shape[i]- -x)] = t.divs[i/2];
}
// 遍历整个容器，判断是否可以消除
this.findFull = function()
{
var s = 0;
for(var m=0;m<row;m++)
{
var count = 0;
for(var n=0;n<col;n++)
if(this[m*100+n])
count++;
if(count==col)
{
s++;
this.removeLine(m);
}
}
this.score -= -this.calScore(s);
}
this.calScore = function(s)
{
if(s!=0)
return s- -this.calScore(s-1)
else
return 0;
}
// 消除指定一行方块
this.removeLine = function(row)
{
// 移除一行方块
for(var n=0;n<col;n++)
document.body.removeChild(this[row*100+n]);
// 把所消除行上面所有的方块下移一行
for(var i=row;i>0;i--)
{
for(var j=0;j<col;j++)
{
this[i*100- -j] = this[(i-1)*100- -j]
if(this[i*100- -j])
this[i*100- -j].style.top = i*size + "px";
}
}
}
}
function init()
{
container = new Container();
container.init();
tetris = new Tetris();
tetris.container = container;
document.onkeydown = function(e)
{
if(isOver) return;
var e = window.event?window.event:e;
switch(e.keyCode)
{
case 38: //up
tetris.rotate();
break;
case 40: //down
tetris.vMove(1);
break;
case 37: //left
tetris.hMove(-1);
break;
case 39: //right
tetris.hMove(1);
break;
}
}
setInterval("if(!isOver) tetris.vMove(1)",500);
}
</script>
</head>
<body onload="init()">
</body>
</html>
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