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index.html
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index.html
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8" />
<meta
name="viewport"
content="width=device-width, initial-scale=1, maximum-scale=1, user-scalable=no"
/>
<title>Document</title>
<style>
html,
body {
margin: 0;
height: 100%;
}
#wrap {
margin-left: auto;
margin-right: auto;
padding: 10px;
box-sizing: border-box;
}
#container {
width: 100%;
display: grid;
grid-template-columns: repeat(50, 2%);
grid-template-rows: repeat(50, 2%);
background: grey;
}
#handler {
height: 200px;
display: flex;
flex-flow: row nowrap;
justify-content: space-between;
margin: 10px;
}
#handler > div {
width: 200px;
display: flex;
background: yellowgreen;
margin: 10px;
}
#handler > div#horizontal {
flex-flow: row nowrap;
justify-content: space-between;
}
#handler > div#vertical {
flex-flow: column nowrap;
align-content: space-between;
}
#handler > div > button {
flex: 1 0 auto;
margin: 5px;
background: orange;
color: aliceblue;
text-align: center;
}
#handler > div > button#left,
#handler > div > button#up {
item: 0;
}
#handler > div > button#right,
#handler > div > button#down {
item: 1;
}
</style>
</head>
<body>
<div id="wrap">
<div id="container"></div>
<div id="handler">
<div id="horizontal">
<button id="left"> LEFT </button>
<button id="right">RIGHT</button>
</div>
<div id="vertical">
<button id="up">UP</button>
<button id="down">DOWN</button>
</div>
</div>
</div>
<script>
window.onload = function() {
/**
*初始化游戏
*/
//初始化界面大小
function calcuWrap() {
const wrap = document.getElementById("wrap");
const viewportWidth = document.documentElement.clientWidth;
const viewportHeight = document.documentElement.clientHeight;
if (viewportHeight / viewportWidth > 1.331) {
wrap.style.width = "100%";
delete wrap.style.height;
} else {
wrap.style.height = "100%";
wrap.style.width = `${wrap.clientHeight / 1.331}px`;
}
}
calcuWrap();
//初始化面板
const cont = document.getElementById("container");
cont.style.height = cont.offsetWidth + "px";
window.addEventListener(
"resize",
function() {
calcuWrap();
cont.style.height = cont.offsetWidth + "px";
},
false
);
for (let i = 1; i < 50 * 50 + 1; i++) {
const item = document.createElement("div");
item.id = "dot" + i.toString();
cont.appendChild(item);
}
//初始化蛇
const snake = {
init() {
const head = document.getElementById("dot1271");
head.style.backgroundColor = "black";
const b = document.getElementById("dot1270");
b.style.backgroundColor = "black";
const foot = document.getElementById("dot1269");
foot.style.backgroundColor = "black";
this.body.splice(0, 0, head, b, foot);
},
//方向默认向右
direct: "right",
//初始化蛇身
body: [],
//每移动一步
render() {
//寻找蛇头
let newHeadId;
const oldHeadIdNum = parseInt(this.body[0].id.replace(/dot*/, ""));
switch (this.direct) {
case "right":
newHeadId = "dot" + (oldHeadIdNum + 1).toString();
break;
case "left":
newHeadId = "dot" + (oldHeadIdNum - 1).toString();
break;
case "up":
newHeadId = "dot" + (oldHeadIdNum - 50).toString();
break;
case "down":
newHeadId = "dot" + (oldHeadIdNum + 50).toString();
break;
}
//判断是否撞墙
const res = this.nextStepJudge(newHeadId);
if (res === "normal") {
//增加蛇头
const newHead = document.getElementById(newHeadId);
newHead.style.backgroundColor = "black";
this.body.unshift(newHead);
//去掉蛇尾
this.body[this.body.length - 1].style.backgroundColor = "";
this.body.pop(this.body.length - 1);
} else if (res === "eat") {
//增加蛇头
const newHead = document.getElementById(newHeadId);
newHead.style.backgroundColor = "black";
this.body.unshift(newHead);
//不去蛇尾，增加食物
food.create();
} else if (res === "dead") {
//游戏结束
clearInterval(start);
const restart = window.confirm(
`游戏结束，您吃了${snake.body.length - 3}个食物，是否重新开始？`
);
if (restart) {
window.location.reload();
}
}
},
//判断下一步的三种状态（正常normal，吃到eat，撞上dead）
nextStepJudge(dotId) {
//eat
if (dotId === food.dot.id) {
return "eat";
}
//撞着自己
let flagSelf = false;
for (let i = 0; i < this.body.length; i++) {
if (this.body[i].id === dotId) {
flagSelf = true;
break;
}
}
if (flagSelf) {
return "dead";
}
const num = parseInt(dotId.replace(/dot*/, ""));
//撞上下墙
if (this.direct === "up" || this.direct === "down") {
if (num > 2500 || num < 1) {
return "dead";
}
}
//撞左墙
else if (this.direct === "left") {
for (let i = 50; i <= 2500; i += 50) {
if (num === i) {
return "dead";
}
}
}
//撞右墙
else if (this.direct === "right") {
for (let i = 1; i <= 2451; i += 50) {
if (num === i) {
return "dead";
}
}
}
//正常
return "normal";
}
};
//生成食品
const food = {
dot: null,
create() {
const dotId = "dot" + parseInt(Math.random() * 2500).toString();
let flag = false;
for (let i = 0; i < snake.body.length; i++) {
if (snake.body[i].id === dotId) {
flag = true;
break;
}
}
if (flag) {
this.create();
} else {
const dot = document.getElementById(dotId);
dot.style.backgroundColor = "black";
this.dot = dot;
}
}
};
//按键功能
const handler = document.getElementById("handler");
handler.addEventListener(
"click",
function(e) {
const btnId = e.target.id;
switch (btnId) {
case "left":
if (snake.direct === "up" || snake.direct === "down") {
snake.direct = "left";
}
break;
case "right":
if (snake.direct === "up" || snake.direct === "down") {
snake.direct = "right";
}
break;
case "up":
if (snake.direct === "left" || snake.direct === "right") {
snake.direct = "up";
}
break;
case "down":
if (snake.direct === "left" || snake.direct === "right") {
snake.direct = "down";
}
break;
}
},
false
);
snake.init();
food.create();
const start = setInterval(() => {
snake.render();
}, 500);
};
</script>
</body>
</html>