原生JavaScript實現貪吃蛇游戲
本文實例為大家分享了JavaScript實現貪吃蛇游戲的具體代碼，供大家參考，具體內容如下
1.HTML部分，東西很少
<!DOCTYPE html><html lang='en'><head> <meta charset='UTF-8'> <meta name='viewport' content='width=device-width, initial-scale=1.0'> <title>貪吃蛇</title> <style> *{ margin: 0px; padding: 0px; } td{ border-radius: 30%; } </style> </head><body> <script type='text/javascript' src='http://www.b3g6.com/bcjs/snake.js'></script></body></html>
2.JavaScript部分
var arrayBox = new Array(); // 存放單元格var arraySnake = new Array(); // 存放蛇 var food; // 食物var snakeHead; // 蛇頭var key = true; // 判斷頁面是否需要初始化var timekey; // 運動定時器常量function newGame() { bgInit(); arrayBoxInit(); initSnake(); randomFood();}newGame();document.onclick = function () { if (key) { gameStart(arraySnake); key = false; }}// 記錄的單元格數組初始化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; //蛇頭 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'; } } }}// 隨機產生食物食物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(); }}// 開始游戲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() } }}// 初始化運動，（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);}// 鍵盤操作拐彎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); }}// 增加長度在蛇尾function addSnakeLength(temp) { arraySnake.unshift(temp);}
全程獨自敲下來，敲了兩個多小時，基本功能都實現了，由于沒有參考任何東西，所以有很多很多需要優化的地方，點個贊吧
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以上就是本文的全部內容，希望對大家的學習有所幫助，也希望大家多多支持好吧啦網。
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