前端学习笔记day19 贪吃蛇 

<!DOCTYPE html>
<html lang="zh-CN">
<head>
    <meta charset="UTF-8">
    <title>Document</title>
    <style>
        #map {
            width: 800px;
            height: 600px;
            background-color: lightgrey;
            position: relative;
        }
    </style>
</head>
<body>
    <div id='map'></div>

    <script src = 'tools.js'></script>
    <script src ='food.js'></script>
    <script src = 'snack.js'></script>
    <script src = 'game.js'></script>
    <script src = 'main.js'></script>
</body>
</html>
index.html
;(function() {
    var parent = document.getElementById('map');
    var game = new Game(parent);
    game.start();
})()
main.js
;(function() {
    function Game(parent) {
        this.parent = parent;
        this.food = new Food(this.parent);
        this.snack = new Snack(this.parent);
    }
    Game.prototype.start = function() {
        this.food.render();
        runSnack(this);

    }
    function runSnack(that) {

        var timeId = setInterval(function() {
            that.snack.render();
            that.snack.move(that.food);
            if(that.snack.over) {
                alert('Game Over!')
                clearInterval(timeId);
            }
        }.bind(that),150)
    }
    window.Game = Game;
})()
game.js
;(function() {
    function Snack(parent,options) {
        options = options || {};
        this.width = options.width || 20;
        this.height = options.height || 20;
        this.direction = "right";
        this.body = [
        {x: 3, y: 2, color: 'red'},
        {x: 2, y: 2, color: 'pink'},
        {x: 1, y: 2, color: 'pink'}
        ];
        this.parent = parent;
        this.over = false;

    }
    var position = 'absolute';
    var elements = [];
    Snack.prototype.render = function() {

        remove(); 

        for(var i = 0; i < this.body.length; i++) {
            var div = document.createElement('div');
            elements.push(div);
            div.style.width = this.width + 'px';
            div.style.height = this.height + 'px';
            div.style.backgroundColor = this.body[i].color;
            div.style.position = position;
            div.style.left = this.body[i].x * this.width + 'px';
            div.style.top = this.body[i].y * this.height + 'px';
            this.parent.appendChild(div);

        }
    }
    Snack.prototype.move = function(food) {
        var endright = (this.body[0].x) * this.width;
        var endleft = this.body[0].x;
        var endtop = this.body[0].y;
        var endbottom = (this.body[0].y)* this.height;
        for(var i = this.body.length-1; i >=1;i--) {
            this.body[i].x = this.body[i-1].x;
            this.body[i].y = this.body[i-1].y;    
        }
        switch (this.direction) {
            case 'right':
                this.body[0].x +=1;
                break;
            case 'left':
                this.body[0].x -=1;
                break;
            case 'top':
                this.body[0].y -=1;
                break;
            case 'bottom':
                this.body[0].y +=1;
        }
    
        if( endright >= this.parent.offsetWidth || endleft <0 || endbottom >= this.parent.offsetHeight || endtop <0) {
            this.over = true;  // 当蛇头部触及到地图边界时 终止计时器，也就是不让蛇继续移动了，给蛇绑定一个属性
        }
        document.onkeydown = keyDown.bind(this);  // 在蛇移动过程中按下方向键可以改变蛇的运动方向
        meet(this,food);
        this.render();
    
    }

    // 渲染蛇对象之前，需要先对原本的蛇对象删除，因为蛇在移动过程中需要不停的渲染，那首先需要删除之前的蛇对象；
    function remove() {  
        for(var i = elements.length-1; i >= 0; i--) {
            elements[i].parentNode.removeChild(elements[i]);
            elements.splice(i,1);
        }
    }
    function keyDown(e) {
        // console.log(e.keyCode);
        switch(e.keyCode) {
            case 37:
                this.direction = 'left';
                break;
            case 38:
                this.direction = 'top';
                break;
            case 39:
                 this.direction = 'right';
                 break;
             case 40:
                 this.direction = 'bottom';
        }
        
    };
    function meet(that,food) {
    
        var headX = that.body[0].x * that.width;
        var headY = that.body[0].y * that.height;
    
        if(headX == food.x && headY ==food.y) {
            var last = that.body[that.body.length-1];
            that.body.push({
                x: last.x,
                y: last.y,
                color: last.color
            })
            
            that.render();
            food.render();
        }
    };
    window.Snack = Snack;
})();

// 测试代码
// var parent = document.getElementById('map');
// var snack = new Snack(parent);
// snack.render();
snack.js
;(function() {
    function Food(parent,options) {
        options = options || {};
        this.width = options.width || 20;
        this.height = options.height || 20;
        this.color = options.color || 'green';
        this.x = options.x || 0;
        this.y = options.y || 0;
        this.parent = parent;

    }
    var position = 'absolute';
    var elements = [];
    Food.prototype.render = function() {
        console.log(elements.length);
        remove();
        
        var div = document.createElement('div');
        elements.push(div);
        this.x = this.random().x;
        this.y = this.random().y; 
        div.style.width = this.width + 'px';
        div.style.height = this.height + 'px';
        div.style.backgroundColor = this.color;
        div.style.position = position;
        div.style.left = this.x + 'px';
        div.style.top = this.y + 'px';
        this.parent.appendChild(div);
    }
    Food.prototype.random = function() {
        var x = getRandom(0,this.parent.offsetWidth / this.width - 1) * this.width;
        var y = getRandom(0,this.parent.offsetHeight / this.height - 1) *this.height;
        return {
            x: x,
            y: y
        }
    }

    function remove() {
        for(var i = elements.length-1; i>=0; i--) {
            elements[i].parentNode.removeChild(elements[i]);
            elements.splice(i,1);
        }
    }
    window.Food = Food;
})();
// 测试代码
// var map = document.getElementById('map');
// var food = new Food(map);
// food.render();
food.js

运行结果：

开心~

 

posted @ 2019-01-21 19:11  写的BUG代码少  阅读(240)  评论(0)  编辑  收藏  举报