《JavaScript100例|01》之javaScript实现俄罗斯方块，唤起了女朋友儿时的回忆！

导读：小时候我们经常打游戏玩俄罗斯方块，用的是游戏机。

现在我们学会了敲代码，简单用JS实现一下这个游戏把。

先看效果

操作说明

代码实现

完整代码

先看效果

操作说明

打开编译器，讲代码复制进去，在浏览器打开即可，通过键盘上下左右控制，一个人就可以玩耍。

↑控制方块的形态（可以使方块旋转），←向左平移，→向右平移，↓加速下落。方块铺满可以消失，方块排列到顶部游戏gameover.

代码实现

CSS

<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;elsethis.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)elsereturn 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: //uptetris.rotate();break;case 40: //downtetris.vMove(1);break;case 37: //lefttetris.hMove(-1);break;case 39: //righttetris.hMove(1);break;}}setInterval("if(!isOver) tetris.vMove(1)",500);
}
</script>

这样就把项目搞完了，一个简单的俄罗斯方块就完成了，女朋友玩的很快乐！