原生JavaScript实现贪吃蛇游戏

时间：2021-05-25

本文实例为大家分享了JavaScript实现贪吃蛇游戏的具体代码，供大家参考，具体内容如下

1.HTML部分，东西很少

<!DOCTYPE html><html lang="en"><head> <meta charset="UTF-8"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <title>贪吃蛇</title> <style> *{ margin: 0px; padding: 0px; } td{ border-radius: 30%; } </style> </head><body> <script type="text/javascript" src="./snake.js"></script></body></html>

2.JavaScript部分

var arrayBox = new Array(); // 存放单元格var arraySnake = new Array(); // 存放蛇 var food; // 食物var snakeHead; // 蛇头var key = true; // 判断页面是否需要初始化var timekey; // 运动定时器常量function newGame() { bgInit(); arrayBoxInit(); initSnake(); randomFood();}newGame();document.onclick = function () { if (key) { gameStart(arraySnake); key = false; }}// 记录的单元格数组初始化function arrayBoxInit() { for (var y = 0; y < 20; y++) { arrayBox[y] = new Array(); for (var x = 0; x < 20; x++) { arrayBox[y][x] = 0; } }}// 背景初始化function bgInit() { var table = document.createElement("table"); table.style = "border-spacing:0px; border:1px solid #3c3c3c;margin:10% auto"; for (var y = 0; y < 20; y++) { var tr = document.createElement("tr"); for (var x = 0; x < 20; x++) { var td = "<td class='box-" + y + "-" + x + "' style='width: 20px; height: 20px;'></td>"; tr.innerHTML += td; } table.appendChild(tr); } document.body.insertBefore(table, document.getElementsByTagName("script")[0]);}// 初始化蛇function initSnake() { var x = Math.floor(Math.random() * 20); var y = Math.floor(Math.random() * 20); var initA = document.getElementsByClassName("box-" + y + "-" + x)[0]; snakeHead = initA; //蛇头 var b = initBFn(x, y); var initB = document.getElementsByClassName(b)[0]; arraySnake.push(initB); arraySnake.push(initA); initA.style.backgroundColor = "#9c9c9c"; initB.style.backgroundColor = "#9c9c9c"; arrayBox[y][x] = 1; arrayBox[b.split("-")[1]][b.split("-")[2]] = 1;}// 初始化蛇身function initBFn(x, y) { if (x != 19 && x != 0) { if (y != 19 && y != 0) { if (Math.random() > 0.5) { if (Math.random() > 0.5) { return "box-" + y + "-" + (x + 1); } else { return "box-" + y + "-" + (x - 1); } } else { if (Math.random() > 0.5) { return "box-" + (y + 1) + "-" + x; } else { return "box-" + (y - 1) + "-" + x; } } } else if (y == 0) { if (Math.random() > 0.5) { return "box-0-" + (x + 1); } else { return "box-0-" + (x - 1); } } else if (y == 19) { if (Math.random() > 0.5) { return "box-19-" + (x + 1); } else { return "box-19-" + (x - 1); } } } else if (x == 0) { if (y != 19 && y != 0) { if (Math.random() > 0.5) { return "box-" + (y + 1) + "-0"; } else { return "box-" + (y - 1) + "-0"; } } else if (y == 0) { if (Math.random() > 0.5) { return "box-1-0"; } else { return "box-0-1"; } } else if (y == 19) { if (Math.random() > 0.5) { return "box-18-0"; } else { return "box-19-1"; } } } else if (x == 19) { if (y != 19 && y != 0) { if (Math.random() > 0.5) { return "box-" + (y + 1) + "-19"; } else { return "box-" + (y - 1) + "-19"; } } else if (y == 0) { if (Math.random() > 0.5) { return "box-1-19"; } else { return "box-0-18"; } } else if (y == 19) { if (Math.random() > 0.5) { return "box-18-19"; } else { return "box-19-18"; } } }}// 随机产生食物食物function randomFood() { var x = Math.floor(Math.random() * 20); var y = Math.floor(Math.random() * 20); if (!arrayBox[y][x]) { document.getElementsByClassName("box-" + y + "-" + x)[0].style = "background-color:#9c9c9c;border-radius:50%"; arrayBox[y][x] = 1; food = document.getElementsByClassName("box-" + y + "-" + x)[0]; } else { addSnakeLength(); }}// 开始游戏function gameStart(arraySnake) { var Ax = arraySnake[1].className.split("-")[2]; var Ay = arraySnake[1].className.split("-")[1]; var Bx = arraySnake[0].className.split("-")[2]; var By = arraySnake[0].className.split("-")[1]; if (Ay == By) { if (Ax > Bx) { moveRight(); } else { moveLeft() } } else { if (Ay > By) { moveDown() } else { moveUp() } }}// 初始化运动，（方向：右左上下）function moveRight() { timekey = setInterval(function () { var nextBox = document.getElementsByClassName("box-" + arraySnake[arraySnake.length - 1].className.split("-")[1] + "-" + (parseInt(arraySnake[arraySnake.length - 1].className.split("-")[2]) + 1))[0]; if (nextBox) { arrayBox[arraySnake[arraySnake.length - 1].className.split("-")[1]][(parseInt(arraySnake[arraySnake.length - 1].className.split("-")[2]) + 1)] = 1; nextBox.style.backgroundColor = "#9c9c9c"; arraySnake.push(nextBox); arrayBox[arraySnake[0].className.split("-")[1]][arraySnake[0].className.split("-")[2]] = 0; arraySnake[0].style.backgroundColor = "#fff"; arraySnake.shift(); eatFood(); } }, 200);}function moveLeft() { timekey = setInterval(function () { var nextBox = document.getElementsByClassName("box-" + arraySnake[arraySnake.length - 1].className.split("-")[1] + "-" + (parseInt(arraySnake[arraySnake.length - 1].className.split("-")[2]) - 1))[0]; if (nextBox) { arrayBox[arraySnake[arraySnake.length - 1].className.split("-")[1]][(parseInt(arraySnake[arraySnake.length - 1].className.split("-")[2]) - 1)] = 1; nextBox.style.backgroundColor = "#9c9c9c"; arraySnake.push(nextBox); arrayBox[arraySnake[0].className.split("-")[1]][arraySnake[0].className.split("-")[2]] = 0; arraySnake[0].style.backgroundColor = "#fff"; arraySnake.shift(); eatFood(); } }, 200);}function moveUp() { timekey = setInterval(function () { var nextBox = document.getElementsByClassName("box-" + (parseInt(arraySnake[arraySnake.length - 1].className.split("-")[1]) - 1) + "-" + arraySnake[arraySnake.length - 1].className.split("-")[2])[0]; if (nextBox) { arrayBox[(parseInt(arraySnake[arraySnake.length - 1].className.split("-")[1]) - 1)][arraySnake[arraySnake.length - 1].className.split("-")[2]] = 1; nextBox.style.backgroundColor = "#9c9c9c"; arraySnake.push(nextBox); arrayBox[arraySnake[0].className.split("-")[1]][arraySnake[0].className.split("-")[2]] = 0; arraySnake[0].style.backgroundColor = "#fff"; arraySnake.shift(); eatFood(); } }, 200);}function moveDown() { timekey = setInterval(function () { var nextBox = document.getElementsByClassName("box-" + (parseInt(arraySnake[arraySnake.length - 1].className.split("-")[1]) + 1) + "-" + arraySnake[arraySnake.length - 1].className.split("-")[2])[0]; if (nextBox) { arrayBox[(parseInt(arraySnake[arraySnake.length - 1].className.split("-")[1]) + 1)][arraySnake[arraySnake.length - 1].className.split("-")[2]] = 1; nextBox.style.backgroundColor = "#9c9c9c"; arraySnake.push(nextBox); arrayBox[arraySnake[0].className.split("-")[1]][arraySnake[0].className.split("-")[2]] = 0; arraySnake[0].style.backgroundColor = "#fff"; arraySnake.shift(); eatFood(); } }, 200);}// 键盘操作拐弯document.addEventListener("keydown", function (e) { if (e.code == "ArrowDown") { turnDown(); } else if (e.code == "ArrowUp") { turnUp(); } else if (e.code == "ArrowLeft") { turnLeft(); } else if (e.code == "ArrowRight") { turnRight(); }}, false);// 下拐function turnDown() { if (arraySnake[arraySnake.length - 1].className.split("-")[1] == arraySnake[arraySnake.length - 2].className.split("-")[1]) { clearInterval(timekey); moveDown(); }}// 下拐function turnUp() { if (arraySnake[arraySnake.length - 1].className.split("-")[1] == arraySnake[arraySnake.length - 2].className.split("-")[1]) { clearInterval(timekey); moveUp(); }}// 左拐function turnLeft() { if (arraySnake[arraySnake.length - 1].className.split("-")[2] == arraySnake[arraySnake.length - 2].className.split("-")[2]) { clearInterval(timekey); moveLeft(); }}// 右拐function turnRight() { if (arraySnake[arraySnake.length - 1].className.split("-")[2] == arraySnake[arraySnake.length - 2].className.split("-")[2]) { clearInterval(timekey); moveRight(); }}// 蛇吃食物function eatFood() { var temp = food; if (arrayBox[food.className.split("-")[1]][food.className.split("-")[2]] == 0) { randomFood(); addSnakeLength(temp); }}// 增加长度在蛇尾function addSnakeLength(temp) { arraySnake.unshift(temp);}

全程独自敲下来，敲了两个多小时，基本功能都实现了，由于没有参考任何东西，所以有很多很多需要优化的地方，点个赞吧

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