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
通过JavaScript，我们可以实现贪吃蛇游戏，具体功能如下：
（1）通过按上下左右键来改变蛇的移动方向
（2）若蛇撞到自己，则游戏结束
（3）蛇移动出地图边缘时，会从地图的另一边进来
（4）长按方向键，蛇加速移动
（5）蛇吃到食物后，重新生成食物
完整代码如下：
<!DOCTYPE html>
<html lang="en">
 
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
 
<body>
    <script>
        //地图对象
        var Map;
        Map = {
            width: 990,
            height: 600,
            backgroundColor: 'rgba(36, 30, 225, 0.25)',
            map: null,
            createMap: function () {
                if (this.map == null) {
                    this.map = document.createElement("div");
                }
            },
            adornMap: function () {
                this.map.style.position = "relative";
                this.map.style.width = this.width + "px";
                this.map.style.height = this.height + "px";
                this.map.style.backgroundColor = this.backgroundColor;
            },
            initialize: function () {
                this.createMap();
                this.adornMap();
                document.body.appendChild(this.map);
            }
        };
        //蛇对象
        var Snake;
        Snake = {
            snakeWidth: 30,
            snakeHeight: 30,
            snake: [[3, 1, null, 'red'], [2, 1, null, 'black'], [1, 1, null, 'black']],
            maP: null,
            direct: "right",
            timer: null,
            createSnake: function () {
                for (var i = 0; i < this.snake.length; i++) {
                    if (this.snake[i][2] == null) {
                        this.snake[i][2] = document.createElement("div");
                    }
                    this.snake[i][2].style.width = this.snakeWidth + "px";
                    this.snake[i][2].style.height = this.snakeHeight + "px";
                    this.snake[i][2].style.backgroundColor = this.snake[i][3];
                    this.snake[i][2].style.position = "absolute";
                    this.snake[i][2].style.left = this.snake[i][0] * this.snakeWidth + "px";
                    this.snake[i][2].style.top = this.snake[i][1] * this.snakeHeight + "px";
                    this.maP.appendChild(this.snake[i][2]);
                }
            },
            move: function () {
                //蛇身移动
                for (var i = this.snake.length - 1; i > 0; i--) {
                    this.snake[i][0] = this.snake[i - 1][0];
                    this.snake[i][1] = this.snake[i - 1][1];
                }
                //蛇头移动
                switch (this.direct) {
                    case "left":
                        this.snake[0][0] -= 1;
                        break;
                    case "right":
                        this.snake[0][0] += 1;
                        break;
                    case "up":
                        this.snake[0][1] -= 1;
                        break;
                    case "down":
                        this.snake[0][1] += 1;
                        break;
                }
                //防止蛇移动至地图外
                if (this.snake[0][0] > 32) {
                    this.snake[0][0] = 0;
                }
                if (this.snake[0][0] < 0) {
                    this.snake[0][0] = 32;
                }
                if (this.snake[0][1] < 0) {
                    this.snake[0][1] = 19;
                }
                if (this.snake[0][1] > 19) {
                    this.snake[0][1] = 0;
                }
                //若蛇撞到自己，则游戏结束
                for (var i = 1; i < this.snake.length; i++) {
                    if (this.snake[0][0] == this.snake[i][0] && this.snake[0][1] == this.snake[i][1]) {
                        clearInterval(this.timer);
                        alert("游戏结束！");
                        return;
                    }
                }
                //蛇吃到食物时，重新生成食物位置，蛇身变长一节
                if (this.snake[0][0] == Food.left && this.snake[0][1] == Food.top) {
                    Food.createFood();
                    this.snake.push(
                        [
                            this.snake[this.snake.length - 1][0],
                            this.snake[this.snake.length - 1][1],
                            null,
                            "black"
                        ]
                    )
                }
                this.createSnake();
            },
            initialize: function () {
                var that = this;
                that.createSnake();
                that.timer = setInterval(function () {
                    that.move();
                }, 500)
            }
        };
        //食物对象
        var Food;
        Food = {
            foodWidth: 30,
            foodHeight: 30,
            backgroundColor: "orange",
            left: null,
            top: null,
            maP: null,
            snakE: null,
            food: null,
            //创建食物
            createFood: function () {
                this.randomPosition();
                if (this.food == null) {
                    this.food = document.createElement('div');
                    this.food.style.width = this.foodWidth + "px";
                    this.food.style.height = this.foodHeight + "px";
                    this.food.style.backgroundColor = this.backgroundColor;
                    this.food.style.position = "absolute";
                    this.maP.appendChild(this.food);
                }
                this.food.style.left = this.left * this.foodWidth + "px";
                this.food.style.top = this.top * this.foodHeight + "px";
            },
            //随机生成食物位置
            randomPosition: function () {
                var repeat;
                do {
                    repeat = false;
                    this.left = Math.floor(Math.random() * 33);
                    this.top = Math.floor(Math.random() * 20);
                    for (var i = 0; i < this.snakE.length; i++) {
                        if (this.left == this.snakE[i][0] && this.top == this.snakE[i][1]) {
                            repeat = true;
                        }
                    }
                } while (repeat)
            }
        };
        window.addEventListener('load', function () {
            Map.initialize();
            Snake.maP = Map.map;
            Snake.initialize();
            Food.maP = Map.map;
            Food.snakE = Snake.snake;
            Food.createFood();
            //按上下左右键，蛇改变移动方向
            window.addEventListener('keyup', function (e) {
                var direct = e.keyCode;
                switch (direct) {
                    case 37:
                        if (Snake.direct == "right") {
                            return;
                        }
                        Snake.direct = "left";
                        break;
                    case 38:
                        if (Snake.direct == "down") {
                            return;
                        }
                        Snake.direct = "up";
                        break;
                    case 39:
                        if (Snake.direct == "left") {
                            return;
                        }
                        Snake.direct = "right";
                        break;
                    case 40:
                        if (Snake.direct == "up") {
                            return;
                        }
                        Snake.direct = "down";
                        break;
                }
            })
            //长按方向键加速移动
            var lastKey = -1;
            window.addEventListener('keydown', function (e) {
                if (e.keyCode == lastKey) {
                    switch (e.keyCode) {
                        case 37:
                            if (Snake.direct == "right") {
                                return;
                            }
                            Snake.direct = "left";
                            break;
                        case 38:
                            if (Snake.direct == "down") {
                                return;
                            }
                            Snake.direct = "up";
                            break;
                        case 39:
                            if (Snake.direct == "left") {
                                return;
                            }
                            Snake.direct = "right";
                            break;
                        case 40:
                            if (Snake.direct == "up") {
                                return;
                            }
                            Snake.direct = "down";
                            break;
                    }
                    Snake.move();
                }
                lastKey = e.keyCode;
            })
        })
    </script>
</body>
 
</html>
效果图：
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