<!--1、 创建场景 -->
<!-- 2、定义初始数据 以及随机食物 -->
<!-- 3、控制贪吃蛇方向 -->
<!-- 4、判断位置以及和随机食物的位置 增加贪吃蛇长度 -->
HTML部分
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title></title> <style> html,body{ width: 100%; height: 100%; overflow: hidden; } * { margin: 0; padding: 0; } li{ width: 20px; height: 20px; border-radius: 50%; background: chocolate; position: absolute; left: 240px; top: 60px; z-index: 1; list-style: none; } #box{ position: absolute; left:240px; top: 50px; width:800px; height:600px; } </style> </head> <body> <span> 游戏玩法：上下左右控制小蛇的方向。 撞到边缘游戏结束。 长按方向键即可加速。 </span> <ul> <li></li> <li></li> <li></li> </ul> </body>
js开始
function $(id){ return document.getElementById(id); } window.onload = function () { // 创建背景 js_background(); // 随机食物 js_food(); // 创建贪吃蛇 create_snake(); document.onkeydown = function(event){ let evt = event || window.event; switch (evt.keyCode) { case 37:direction="left";break; case 38:direction="up";break; case 39:direction="right";break; case 40:direction="down";break; default:; // console.log(evt.keyCode); } start_snake() } }
//贪吃蛇方向// 创建背景
// 贪吃蛇方向// 创建背景 var direction = "right"; // 创建背景 function js_background(){ let bg = document.createElement("div"); bg.id = "js_bg"; bg.style.cssText = "position:relative;margin :50px auto; background:skyblue; width:800px; height:600px;"; document.body.appendChild(bg); }
//随机食物
var food_left = 0; var food_top = 0; function js_food(){ food_left = parseInt(Math.random()*800/20)*20; food_top = parseInt(Math.random()*600/20)*20; let foodDiv = document.createElement("div"); foodDiv.style.cssText = "position:absolute;width:20px; height: 20px; border-radius:50%; background:yellow;"; foodDiv.style.left = food_left+"px"; foodDiv.style.top = food_top+"px"; foodDiv.id = "foodDiv"; $("js_bg").appendChild(foodDiv); }
//创建贪吃蛇
function create_snake(){ let lis = document.getElementsByTagName("li"); lis[0].style.backgroundColor = "black"; lis[0].style.zIndex = 1; for(let i = 0; i < lis.length; i++){ lis[i].style.left = 280-(i*20)+"px"; lis[i].style.top = 60+"px"; } }
//定时器
// 定时器 let timre = setInterval(start_snake,200); let lis = document.getElementsByTagName("li"); function start_snake(){ let left=parseFloat(lis[0].style.left); let top= parseFloat(lis[0].style.top); // console.log(top) switch (direction) { case "left":left = (left-20);break; case "up":top = (top-20);break; case "right":left = (left+20);break; case "down":top = (top+20);break; default:; } if(left<0 || left>800-20 || top<0 || top>600-20){ window.clearInterval(timre); alert("亲，您Game Over"); return; } // for(let i = 1; i <= lis.length-1; i++){ // lis[i].style.left = lis[i-1].style.left; // lis[i].style.top = lis[i-1].style.top; // } for(var i=lis.length-1;i>0;i--){ lis[i].style.left = lis[i-1].style.left; lis[i].style.top = lis[i-1].style.top; } // 改变第一节 lis[0].style.left = left+"px"; lis[0].style.top = top+"px"; // console.log(food_top+"----------"); // console.log(top); if(left == food_left && top == food_top){ eat(); } } function eat() { $("js_bg").removeChild($("foodDiv")); js_food(); // alert("ll"); let li = document.createElement("li"); $("js_bg").appendChild(li); // create_snake(); }
更多关于JavaScript相关内容感兴趣的读者可查看本站专题：《JavaScript数学运算用法总结》、《JavaScript数据结构与算法技巧总结》、《JavaScript数组操作技巧总结》、《JavaScript时间与日期操作技巧总结》及《JavaScript错误与调试技巧总结》