<!DOCTYPE html>
<html lang="zh">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
<style>
* {
margin: 0;
padding: 0;
}
.bd {
width: 500px;
position: absolute;
transform: translateX(-50%) translateY(-50%);
left: 50%;
top: 50%
}
body {
background-color: rgba(0, 0, 0, 0.1);
}
.row {
display: flex;
justify-content: space-around;
}
span {
display: block;
width: 50px;
height: 50px;
background-color: skyblue;
border: 1px solid black;
}
.bdgreen {
background-color: green;
}
.bdblack {
background-color: black;
}
</style>
</head>
<body>
<h1>当前积分</h1>
<br>
<h2></h2>
<br>
<div>使用wasd或者上下左右操作，按下esc可暂停游戏</div>
<div class="bd"></div>
<script>
let arr = new Array(10)
let h = document.querySelector("h1")
const h2 = document.querySelector("h2")
localStorage.getItem("")
h2.innerHTML = `最高分数为：${localStorage.getItem("score") || 0}分`
for (let i = 0; i < arr.length; i++) {
arr[i] = new Array(10)
for (let j = 0; j < arr[i].length; j++) {
arr[i][j] = 0
}
}
for (let i = 0; i < arr.length; i++) {
const div = document.createElement("div")
for (let j = 0; j < arr.length; j++) {
const span = document.createElement("span")
div.appendChild(span)
}
div.className = "row"
div.innerHTML += "<br>"
document.querySelector(".bd").appendChild(div)
}
const spanarr = document.querySelectorAll("span")
function rand() {
const x = parseInt(Math.random() * 10)
const y = parseInt(Math.random() * 10)
return { x, y }
}
function addReward() {
const { x, y } = rand()
spanarr[x * 10 + y].classList.add("bdgreen")
return { x, y }
}
function Location(x, y, lastX, lastY) {
this.x = x;
this.y = y;
this.lastX = lastX;
this.lastY = lastY;
}
let x = 0, y = 0;
let direction = { x: 0, y: 0 }
let hassnake = []
let reward
let score = 0
let sankeLength = 1
// 速度
let speed = 200;
const timer = setInterval(() => {
// 此时x和y保存上一次的位置信息
let lastX = x, lastY = y;
x += direction.x;
y += direction.y;
// console.log("当前蛇头在：", x, y)
if (x >= 10 || x < 0 || y >= 10 || y < 0) {
alert("游戏结束")
localStorage.setItem("score", score)
clearInterval(timer)
init()
location.reload()
}
console.log("snake:")
for (let i = 0; i < sankeLength; i++) {
for (let j = 0; j < sankeLength; j++) {
if (i == j)
continue;
if (hassnake[i].x == hassnake[j].x && hassnake[i].y == hassnake[j].y) {
alert("游戏结束")
localStorage.setItem("score", score)
clearInterval(timer)
init()
location.reload()
}
}
}
//每一个元素都要获取前一个元素信息，
for (let i = sankeLength - 1; i >= 1; i--) {
if (i == sankeLength - 1) {
lastX = hassnake[i].x;
lastY = hassnake[i].y
}
hassnake[i].x = hassnake[i - 1].x;
hassnake[i].y = hassnake[i - 1].y;
}
//头部的信息
hassnake[0].x = x;
hassnake[0].y = y;
hassnake[sankeLength - 1].lastX = lastX
hassnake[sankeLength - 1].lastY = lastY
for (let i = 0; i < 100; i++) {
spanarr[i].classList.remove("bdblack")
}
spanarr[reward.x * 10 + reward.y].classList.add("bdgreen")
for (let i = 0; i < sankeLength; i++) {
spanarr[hassnake[i].x * 10 + hassnake[i].y].classList.add("bdblack")
}
if (x == reward.x && y == reward.y) {
spanarr[x * 10 + y].classList.remove("bdgreen")
reward = addReward()
const Controls = new Location(hassnake[sankeLength - 1].lastX, hassnake[sankeLength - 1].lastY, 0, 0)
hassnake.push(Controls)
score += 1
h.innerHTML = `当前积分：${score}`
sankeLength += 1
}
}, speed)
function init() {
reward = addReward()
spanarr[0].classList.add("bdblack")
direction = { x: 0, y: 0 }
his = []
score = 0
sankeLength = 1
h.innerHTML = `当前积分：${score}分`
hassnake = []
const init = new Location(0, 0, 0, 0)
hassnake.push(init)
}
init()
window.addEventListener("keyup", function (e) {
console.log(e)
if (e.code == "KeyW" || e.code == "ArrowUp") {
direction = { x: -1, y: 0 }
}
if (e.code == "KeyD" || e.code == "ArrowRight") {
direction = { x: 0, y: 1 }
}
if (e.code == "KeyS" || e.code == "ArrowDown") {
direction = { x: 1, y: 0 }
}
if (e.code == "KeyA" || e.code == "ArrowLeft") {
direction = { x: 0, y: -1 }
}
if (e.code == "Escape") {
direction = { x: 0, y: 0 }
}
})
</script>
</body>
</html>学js的时候突然发现贪吃蛇好像就是保存到一个二维数组，然后根据不同的状态渲染页面就行，于是就手写出来了，不过感觉时间复杂度有点高，应该有更好的实现方式
调整移动速度可以修改speed（单位是毫秒），直接用speed做定时器的循环时间
没有写绿色方块不能生成在黑色方块的逻辑（只要循环一下黑色方块，然后判断一下随机数在不在里面，在里面就重新生成一个，直到没有）
看起来应该没有BUG吧......