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2020
11-04

原生JavaScript实现贪吃蛇游戏

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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