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原生javascript制作贪吃蛇小游戏

2018-12-22 17:35 471 查看

HTML部分

[code]<!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 id="box">
<li></li>
<li></li>
<li></li>
</ul>

</body>

//js开始

[code]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

[code]// 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

[code]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

[code]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

[code]
// 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();

}

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