华山资源网

js实现贪吃蛇小游戏
网络编程 2024/11/18 佚名
3 1

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

index.html

<!DOCTYPE html>
<html lang="en">
<head>
 <meta charset="UTF-8">
 <meta name="viewport" content="width=device-width, initial-scale=1.0">
 <meta http-equiv="X-UA-Compatible" content="ie=edge">
 <title>贪吃蛇</title>
 <link rel="stylesheet" href="style.css" >
</head>
<body>
 <div id="game">
  <div id="explain">
   <div>操作WASD 空格开始/暂停 R重新开始</div>
   <div>当前分数：<span id="grade">0</span>分</div>
  </div>
  <canvas id="snakegame" width="500" height="500">
  </canvas>
 </div>
 <script type="text/javascript" src="/UploadFiles/2021-04-02/main.js">


style.css





*{
 padding: 0;
 margin: 0;
}
#game {
 width: 500px;
 margin: auto;
}
#explain {
 width: 500px;
}
#explain div{
 width: 500px;
 height: 30px;
}
#snakegame {
 background: green;
}





main.js





/**
 * el 挂载的元素
 * attribute 贪吃蛇的属性
 */
class Game {
 constructor (el, attribute) {
  this.el = document.getElementById(el);
  // 获取画布的宽高
  this.el.elW = parseInt(window.getComputedStyle(this.el).width);
  this.el.elH = parseInt(window.getComputedStyle(this.el).height);
  this.init(attribute);
  this.keyListening();
 }
 // 初始化
 init(attribute) {
  this.attribute = {
   color: "red", // 颜色
   direction: "rigth", // 移动方向
   state: "pause", // 状态 run pause end
   grade: 0, // 分数
   body: [{x: 20, y: 0}, {x: 0, y: 0}], // 贪吃蛇身体
   wh: 20, // 矩形的宽高
   speed: 200 // 速度
  };
  if (attribute) {
   this.newAttribute = attribute;
   Object.keys(attribute).forEach(key => {
    this.attribute[key] = attribute[key];
   });
  }
  this.food ={
   x: 0,
   y: 0,
   color: 'red'
  }
  this.draw();
  this.foodDraw();
 }
 // 绘制贪吃蛇
 draw() {
  let el = this.el;
  let { body, wh, color } = this.attribute;
  // 确定浏览器是否支持canvans元素
  if (el.getContext) {
   let context = snakegame.getContext("2d");
   context.fillStyle = color;
   body.forEach( key => {
    context.fillRect(key.x, key.y, wh, wh);
   });
  }
 }
 // 随机生成食物
 foodDraw() {
  let el = this.el, wh = this.attribute.wh;
  this.food.x = Math.floor(Math.random()*(el.elW - wh)),
  this.food.y = Math.floor(Math.random()*(el.elH - wh));
  while (this.isOverlap()) {
   this.food.x = Math.floor(Math.random()*(el.elW - wh)),
   this.food.y = Math.floor(Math.random()*(el.elH - wh));
  }
  if (el.getContext) {
   let context = snakegame.getContext("2d");
   context.fillStyle = this.food.color;
   context.fillRect(this.food.x, this.food.y, wh, wh);
  }
 }
 // 判断食物是否与贪吃蛇的身体重叠
 isOverlap() {
  let { wh } = this.attribute;
  let food = this.food;
  let flag = false;
  function isIn(key, x, y) {
   if (key.x <= x && key.x + wh >= x && key.y <= y && key.y + wh >= y) {
    return true;
   } else {
    return false;
   }
  }
  this.attribute.body.forEach(key => {
   // 食物的上下左右四个点一个点在贪吃蛇的身体内就判断为重叠
   if (isIn(key, food.x, food.y) || isIn(key, food.x, food.y + wh) || isIn(key, food.x + wh, food.y) || isIn(key, food.x + wh, food.y + wh)) {
    flag = true;
   }
  });
  return flag;
 }
 // 清除图形
 clear(x, y, width, height) {
  // 确定浏览器是否支持canvans元素
  if (this.el.getContext) {
   let context = snakegame.getContext("2d");
   context.clearRect(x, y, width, height);
  }
 }
 // 游戏状态更新
 updateState(state) {
  this.attribute.state = state;
  if (state === "run") {
   this.run();
  } 
 }
 // 游戏线程
 run() {
  let { body, wh, speed} = this.attribute;
  let time = setInterval(() => {
   // 判断游戏线程是否在运行
   if (this.attribute.state !== 'run') {
    clearInterval(time);
   }
   let obj = {};
   switch(this.attribute.direction) {
    case 'left':
     obj['x'] = body[0].x - wh;
     obj['y'] = body[0].y;
     break;
    case 'rigth':
     obj['x'] = body[0].x + wh;
     obj['y'] = body[0].y;
     break;
    case 'up':
     obj['x'] = body[0].x;
     obj['y'] = body[0].y - wh;
     break;
    case 'down':
     obj['x'] = body[0].x;
     obj['y'] = body[0].y + wh;
     break;
   }
   body.unshift(obj);
   // 判断是否吃到食物 
   if (this.isOverlap()) {
    this.clear(this.food.x, this.food.y, wh, wh);
    this.attribute.grade++; 
    this.foodDraw();
    this.draw();
   } else {
    if (this.end()) {
     alert("游戏结束");
     this.updateState('end');
     clearInterval(time);
    } else {
     let item = body.pop();
     this.clear(item.x, item.y, wh, wh);
     this.draw();
    }
   }
  }, speed);
 }
 // 键盘事件监听
 keyListening() {
  document.onkeydown = (event) => {
   let e = event || window.event || arguments.callee.caller.arguments[0];
   if (e && e.keyCode === 87 && this.attribute.direction !== 'down') { // 按下W
    this.attribute.direction = 'up';
   }
   if (e && e.keyCode === 65 && this.attribute.direction !== 'rigth') { // 按下A
    this.attribute.direction = 'left';
   }
   if (e && e.keyCode === 68 && this.attribute.direction !== 'left') { // 按下D
    this.attribute.direction = 'rigth';
   }
   if (e && e.keyCode === 83 && this.attribute.direction !== 'up') { // 按下W
    this.attribute.direction = 'down';
   }
   if (e && e.keyCode === 32) { // 按下空格 
    let state;
    if (this.attribute.state === 'pause') {
     state = 'run';
    } 
    if (this.attribute.state === 'run') {
     state = 'pause';
    }
    this.updateState(state);
   }
   if (e && e.keyCode === 82) { // 按下R键
    this.reStart();
   }
  } 
 }
 // 是否死亡
 end() {
  let body = [...this.attribute.body];
  let obj = body.shift();
  let flag = false;
  if (obj.x < 0 || obj.x >= this.el.elW || obj.y < 0 || obj.y >= this.el.elH) {
   flag = true;
  }
  body.forEach(key => {
   if (key.x === obj.x && key.y === obj.y) {
    flag = true;
   }
  });
  return flag;
 }
 // 重新开始
 reStart() {
  // 清除整个画布
  this.clear(0, 0, this.el.elW, this.el.elH);
  // 重新开始
  this.init(this.newAttribute);
 }
}
let game = new Game("snakegame", {color: "yellow"});
let grade = document.getElementById("grade");
let oldGrade = game.attribute.grade;
setInterval(() => {
 if (oldGrade !== game.attribute.grade) {
  oldGrade = game.attribute.grade;
  grade.innerText = game.attribute.grade;
 }
})





截图


js实现贪吃蛇小游戏


以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持。
华山资源网 Design By www.eoogi.com
广告合作：本站广告合作请联系QQ：858582 申请时备注：广告合作（否则不回）
免责声明：本站资源来自互联网收集,仅供用于学习和交流,请遵循相关法律法规,本站一切资源不代表本站立场,如有侵权、后门、不妥请联系本站删除！
华山资源网 Design By www.eoogi.com
www.eoogi.com 华山资源网
120,135影音资源
344,641技术资源
22,817软件资源
435,032站长资源

更新日志

友情链接

杰晶网络 DDR爱好者之家 桃源资源网 杰网资源 富贵资源网 南强小屋 铁雪资源网 幽灵资源网 万梅资源网 狼山资源网 白云岛资源网 昆仑资源网 相思资源网 明霞山资源网 内蒙古资源网 黑松山资源网 茶园资源网 饿虎岗资源网 大旗谷资源网 常春岛资源网 岱庙资源网 兴国资源网 快活林资源网 蝙蝠岛资源网 帝王谷资源网 白云城资源网 伏龙阁资源网 清风细雨楼 天枫庄资源网 圆月山庄资源网 无争山庄资源网 神水资源网 移花宫资源网 神剑山庄资源网 无为清净楼资源网 金钱帮资源网 丐帮资源网 华山资源网 极乐门资源网 小李飞刀资源网 凤求凰客栈 风云阁资源网 金狮镖局 鸳鸯亭资源网 千金楼资源网 更多链接
华山资源网 Design By www.eoogi.com