Html5原创俄罗斯方块（基于canvas）

this.arr_store_Y = [] // 存放到达底部所有方块的Y坐标
this.arr_store_color = [] // 存放到达底部所有方块的颜色
this.paints = document.getElementById('tetris').getContext('2d')
//获取画笔
self = this
}

// 封装paints方法，让代码更简洁
paintfr(x, y, scale=1){
this.paints.fillRect(x*this.side, y*this.side, scale*this.side, scale*this.side)
}

// 游戏开始
gameStart(){
this.init()
this.run()
}

// 初始化工作
init(){
this.initBackground()
this.initBlock()
}

// 方块自动下落
run(){
this.ident = setInterval("self.down_speed_up()", this.speed)
}

// 初始化地图
initBackground(){
this.paints.beginPath()
this.paints.fillStyle='#000000' //地图填充颜色为黑色
for(let i = 0; i < this.height; i++){
for(let j = 0; j < this.width; j++){
this.paintfr(j, i)
}
}
this.paints.closePath()
}

// 初始化方块的位置和颜色
initBlock(){
this.paints.beginPath()
this.createRandom('rColor') //生成颜色字符串，
this.paints.fillStyle = this.type_color
this.createRandom('rBlock') //生成方块类型数字
this.arr_bX.forEach((item, index) => {
this.paintfr(item, this.arr_bY[index], 0.9)
})
this.paints.closePath()
}

// 利用数组画方块
drawBlock(color){
this.paints.beginPath()
this.paints.fillStyle = color
this.arr_bX.forEach((item, index) => {
this.paintfr(item, this.arr_bY[index], 0.9)
})
this.paints.closePath()
}

// 画已经在定位好的方块
drawStaticBlock(){
this.arr_store_X.forEach((item, index) => {
this.paints.beginPath()
this.paints.fillStyle = this.arr_store_color[index]this.paintfr(item, this.arr_store_Y[index], 0.9)
this.paints.closePath()
})
}

// 生成随机数返回方块类型或颜色类型
createRandom(type){
let temp = this.width/2-1

if (type == 'rBlock'){ //如果是方块类型
this.num_blcok = Math.round(Math.random()*4+1)
switch(this.num_blcok){
case 1:
this.arr_bX.push(temp,temp-1,temp,temp+1)
this.arr_bY.push(0,1,1,1)
break
case 2:
this.arr_bX.push(temp,temp-1,temp-1,temp+1)
this.arr_bY.push(1,0,1,1)
break
case 3:
this.arr_bX.push(temp,temp-1,temp+1,temp+2)
this.arr_bY.push(0,0,0,0)
break
case 4:
this.arr_bX.push(temp,temp-1,temp,temp+1)
this.arr_bY.push(0,0,1,1)
break
case 5:
this.arr_bX.push(temp,temp+1,temp,temp+1)
this.arr_bY.push(0,0,1,1)
break
}
}
if (type == 'rColor'){ //如果是颜色类型
let num_color = Math.round(Math.random()*8+1)

switch(num_color){
case 1:
this.type_color='#3EF72A'
break
case 2:
this.type_color='yellow'
break
case 3:
this.type_color='#2FE0BF'
break
case 4: