javascript实现小游戏贪吃蛇
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2024-03-19 08:16:28
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贪吃蛇
style
<style>
.face{
height: 400px;
width: 600px;
margin-left: auto;
margin-right: auto;
position: relative;
background-color: pink;
}
#playground{
height: 400px;
width: 450px;
float: left;
position: relative;
}
.menu{
height: 400px;
width: 150px;
float: left;
background-color: skyblue;
}
#snack{
height: 20px;
width: 20px;
background-color: red;
position: absolute;
left: 0px;
top:0px;
}
#food{
height: 20px;
width: 20px;
background: blue;
position: absolute;
}
.body{
height: 20px;
width: 20px;
background: green;
position: absolute;
left: 0px;
top:0px;
}
#score{
font-size: 30px;
font-weight: bold;
color: red;
}
.menu div{
font-size: 20px;
font-weight: bold;
}
</style>
html
<body>
<div class="face">
<!-- 小蛇移动的操场 -->
<div id="playground">
<!-- 食物 界面中的蓝色小方块-->
<div id="food"></div>
<!-- 小蛇 界面中的红色小方块-->
<div id="snack"></div>
</div>
<!-- 计算得分 -->
<div class="menu">
<div>得分<span id="score"></span></div>
</div>
</div>
</body>
javascript
<script>
var jsDiv = document.getElementById("playground");
var jsSnack = document.getElementById("snack");
var jsFood = document.getElementById("food");
var jsBody = document.getElementById("playground");
var jsScore = document.getElementById("score");
//设置全局变量
var timer;//创建定时器为全局变量
var timer1 = setInterval(eat,10);//检测位置碰撞，并且吃掉食物；
var srr = [];//记录蛇行动的位置
var num = 0 ;//记录数组的长度
var jsSnackBody ;//么米吃掉一个食物，蛇的身体
//开始游戏
document.onkeydown = function(e){
var evt = e || window.event;
switch(evt.keyCode) {
//向左移动
case 37:
clearInterval(timer);
timer=window.setInterval(runLeft,10)
function runLeft(){
if (jsSnack.offsetLeft > 0) {
jsSnack.style.left = jsSnack.offsetLeft - 1+ "px";
jsSnack.style.top = jsSnack.offsetTop + "px";
//记录小蛇的位置
srr.push([jsSnack.offsetLeft, jsSnack.offsetTop]);
num++;//记录数组的长度
}
}
break;
//向上移动
case 38:
clearInterval(timer);
timer=window.setInterval(runTop,10);
function runTop(){
if (jsSnack.offsetTop > 0) {
jsSnack.style.top = jsSnack.offsetTop - 1 + "px";
jsSnack.style.left = jsSnack.offsetLeft + "px";
//记录小蛇的位置
srr.push([jsSnack.offsetLeft, jsSnack.offsetTop]);
num++;//记录数组的长度
}
}
break;
//向右移动
case 39:
clearInterval(timer);
timer=window.setInterval(runRight,10);
function runRight(){
if (jsSnack.offsetLeft + jsSnack.offsetWidth <= 450) {
jsSnack.style.left = jsSnack.offsetLeft + 1 + "px";
jsSnack.style.top = jsSnack.offsetTop + "px";
//记录小蛇的位置
srr.push([jsSnack.offsetLeft, jsSnack.offsetTop]);
num++;//记录数组的长度
}
}
break;
//向下移动
case 40:
clearInterval(timer);
timer=window.setInterval(runBottom,10);
function runBottom(){
if (jsSnack.offsetTop + jsSnack.offsetHeight <= 400) {
jsSnack.style.top = jsSnack.offsetTop + 1 + "px";
jsSnack.style.left = jsSnack.offsetLeft + "px";
//记录小蛇的位置
srr.push([jsSnack.offsetLeft, jsSnack.offsetTop]);
num++;//记录数组的长度
}
}
break;
}
}
function Pos(){
jsFood.style.left=parseInt(Math.random() * (430 - 20 + 1) + 20) + "px";
jsFood.style.top=parseInt(Math.random() * (380 - 20 + 1) + 20) + "px";
}
Pos();
function eat(){
rectangleCrashExamine(jsSnack,jsFood);
function rectangleCrashExamine(obj1, obj2) {
var obj1Left = obj1.offsetLeft;
var obj1Width = obj1.offsetLeft + obj1.offsetWidth;
var obj1Top = obj1.offsetTop;
var obj1Height = obj1.offsetTop + obj1.offsetHeight;
var obj2Left = obj2.offsetLeft;
var obj2Width = obj2.offsetLeft + obj2.offsetWidth;
var obj2Top = obj2.offsetTop;
var obj2Height = obj2.offsetTop + obj2.offsetHeight;
//检测碰撞
//碰撞检测原理：
//蛇在实物的左边、右边、上边、下边的时候，说明没有发生碰撞，那么我们取反，就说明发生碰撞
if ( !(obj1Left > obj2Width || obj1Width < obj2Left || obj1Top > obj2Height || obj1Height < obj2Top) ) {
//碰撞后身体
jsSnackBody = document.createElement("div");
jsSnackBody.setAttribute("class","body");
jsBody.appendChild(jsSnackBody);
Pos();//怪物的位置随机变换
setInterval(follow,10);//身体跟随的定时器
}
}
}
function follow(){
//检查一共添加了多少身体
var bodyNum = document.getElementsByClassName("body");
//记录得分
jsScore.innerHTML = bodyNum.length;
//蛇每次移动1个像素，那么新的身体应该跟随在当前数组的倒数第20个数组的位置;依次加等;
var place = 0 ;
for( var i = 0 ; i<bodyNum.length ; i++){
place += 20;
bodyNum[i].style.left=srr[num-place][0] + 'px';
bodyNum[i].style.top=srr[num-place][1] + 'px';
}
}
</script>
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