js实现贪吃蛇游戏含注释

本文实例为大家分享了js实现贪吃蛇游戏的具体代码，供大家参考，具体内容如下

两个小时完成的，有点简陋。

直接看效果。打开调试面板，在resource面板，新建snippet

粘贴以下代码，右键snippet，run。

clearInterval(timer);document.body.innerHTML = '';//每秒移动多少格let speed = 10;let speedUpMul = 3;//是否能穿墙let isThroughTheWall = true;//行数let row = 40;let headColor = ’red’;let bodyColor = ’green’;let foodColor = ’yellow’;let borderColor = ’grey’;// 游戏全局变量let hasFood = false;//游戏状态let gamestaus = ’start’;let hasAccelerate = false;let mainContainer = document.createElement('div');mainContainer.style.width = 20 * row + 1 + 'px';mainContainer.style.height = 20 * row + 1 + 'px';mainContainer.style.margin = '0 auto';mainContainer.style.position = 'relative';mainContainer.style.border = '1px solid ' + borderColor;document.body.appendChild(mainContainer);for(let i = 0;i<row;i++){ let marginTop = 20 * i + 'px'; for(let j = 0;j<row;j++){ let marginLeft = j * 20 + 'px'; let tempDiv = document.createElement(’div’); tempDiv.style.width = '19px'; tempDiv.style.height = '19px'; tempDiv.style.marginTop = marginTop; tempDiv.style.marginLeft = marginLeft; tempDiv.style.border = '0.5px solid ' + borderColor; tempDiv.style.position = 'absolute'; tempDiv.id = j + 'div' + i; mainContainer.appendChild(tempDiv); }}class Cell{ constructor(x, y, color){ if(isThroughTheWall){ if(x < 0) x = row-1; if(x > row - 1) x = 0; if(y < 0) y = row - 1; if(y > row - 1) y = 0; }else{ if(x < 0 || y < 0|| x > row - 1 || y > row - 1){ clearInterval(timer); alert(’游戏结束’); return; } } this.x = x; this.y = y; this.color = color; let tempDiv = document.getElementById(x + ’div’ + y); if(tempDiv) tempDiv.style.backgroundColor = color; }}snake = { head : {}, body : [], dire : 1}let headx = Math.floor(Math.random() * 14) + 3;let heady = Math.floor(Math.random() * 14) + 3;snake.head = new Cell(headx, heady, headColor);//上右下左let direction = [1, 2, 3, 4]snake.dire = direction[Math.floor(Math.random() * 4)];if(snake.dire == 1){ snake.body.push(new Cell(snake.head.x, snake.head.y+1, bodyColor)); snake.body.push(new Cell(snake.head.x, snake.head.y+2, bodyColor)); snake.body.push(new Cell(snake.head.x, snake.head.y+3, bodyColor));}if(snake.dire == 2){ snake.body.push(new Cell(snake.head.x-1, snake.head.y, bodyColor)); snake.body.push(new Cell(snake.head.x-2, snake.head.y, bodyColor)); snake.body.push(new Cell(snake.head.x-3, snake.head.y, bodyColor));}if(snake.dire == 3){ snake.body.push(new Cell(snake.head.x, snake.head.y-1, bodyColor)); snake.body.push(new Cell(snake.head.x, snake.head.y-2, bodyColor)); snake.body.push(new Cell(snake.head.x, snake.head.y-3, bodyColor));}if(snake.dire == 4){ snake.body.push(new Cell(snake.head.x+1, snake.head.y, bodyColor)); snake.body.push(new Cell(snake.head.x+2, snake.head.y, bodyColor)); snake.body.push(new Cell(snake.head.x+3, snake.head.y, bodyColor));}function game(){ if(gamestaus == ’pause’){ return; } if(gamestaus == ’gameover’){ clearInterval(timer); alert(’游戏结束’); return; } initFood(); let snakeHeadX = snake.head.x; let snakeHeadY = snake.head.y; let color = ’’; if(snake.dire == 1){ let tempDiv = document.getElementById(snakeHeadX + ’div’ + (snakeHeadY-1)); if(tempDiv) color = tempDiv.style.backgroundColor; snake.head = new Cell(snakeHeadX, snakeHeadY - 1, headColor); } if(snake.dire == 2){ let tempDiv = document.getElementById((snakeHeadX + 1) + ’div’ + snakeHeadY); if(tempDiv) color = tempDiv.style.backgroundColor; snake.head = new Cell(snakeHeadX + 1, snakeHeadY, headColor); } if(snake.dire == 3){ let tempDiv = document.getElementById(snakeHeadX + ’div’ + (snakeHeadY+1)); if(tempDiv) color = tempDiv.style.backgroundColor; snake.head = new Cell(snakeHeadX, snakeHeadY + 1, headColor); } if(snake.dire == 4){ let tempDiv = document.getElementById((snakeHeadX - 1) + ’div’ + snakeHeadY); if(tempDiv) color = tempDiv.style.backgroundColor; snake.head = new Cell(snakeHeadX - 1, snakeHeadY, headColor); } snake.body.unshift(new Cell(snakeHeadX, snakeHeadY, bodyColor)); if(color && color == foodColor){ hasFood = false; initFood(); }else if(color && color == bodyColor){ gamestaus = ’gameover’; }else{ let lastBody = snake.body.pop(); new Cell(lastBody.x, lastBody.y, ’’); }}var timer = setInterval(game, 10 / speed * 100)/** * 初始化食物 */function initFood(){ while(!hasFood){ let x = Math.floor(Math.random() * row); let y = Math.floor(Math.random() * row); let snakeBody = snake.body; let enable = true; if(snake.head.x == x && snake.head.y == y){ enable = false; } for(sBody of snakeBody){ if(sBody.x == x && sBody.y == y){ enable = false; break; } } if(enable){ new Cell(x, y, foodColor); hasFood = true; } }}document.onkeydown = function(e){ if(e.keyCode == 38){ //上 if(snake.dire != 3 && snake.dire != 1){ snake.dire = 1; }else if(snake.dire == 1){ if(!hasAccelerate){ clearInterval(timer); hasAccelerate = true; speed = speed * speedUpMul; timer = setInterval(game, 10 / speed * 100) } } } if(e.keyCode == 39){ //右 if(snake.dire != 4 && snake.dire != 2){ snake.dire = 2; }else if(snake.dire == 2){ if(!hasAccelerate){ clearInterval(timer); hasAccelerate = true; speed = speed * speedUpMul; timer = setInterval(game, 10 / speed * 100) } } } if(e.keyCode == 40){ //下 if(snake.dire != 1 && snake.dire != 3){ snake.dire = 3; }else if(snake.dire == 3){ if(!hasAccelerate){ clearInterval(timer); hasAccelerate = true; speed = speed * speedUpMul; timer = setInterval(game, 10 / speed * 100) } } } if(e.keyCode == 37){ //左 if(snake.dire != 2 && snake.dire != 4){ snake.dire = 4; }else if(snake.dire == 4){ if(!hasAccelerate){ clearInterval(timer); hasAccelerate = true; speed = speed * speedUpMul; timer = setInterval(game, 10 / speed * 100) } } } //空格键暂停 if(e.keyCode == 32){ if(gamestaus == ’start’){ gamestaus = ’pause’; }else if(gamestaus == ’pause’){ gamestaus = ’start’; } }}document.onkeyup = function(e){ if(e.keyCode == 38){ //上 if(snake.dire == 1 && hasAccelerate){ clearInterval(timer); hasAccelerate = false; speed = speed / speedUpMul; timer = setInterval(game, 10 / speed * 100) } } if(e.keyCode == 39){ //右 if(snake.dire == 2 && hasAccelerate){ clearInterval(timer); hasAccelerate = false; speed = speed / speedUpMul; timer = setInterval(game, 10 / speed * 100) } } if(e.keyCode == 40){ //下 if(snake.dire == 3 && hasAccelerate){ clearInterval(timer); hasAccelerate = false; speed = speed / speedUpMul; timer = setInterval(game, 10 / speed * 100) } } if(e.keyCode == 37){ //左 if(snake.dire == 4 && hasAccelerate){ clearInterval(timer); hasAccelerate = false; speed = speed / speedUpMul; timer = setInterval(game, 10 / speed * 100) } }}

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