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js实现带积分弹球小游戏

作者：你你你就你　　发布时间：2024-04-10 16:19:15　

标签：js,弹球

本文实例为大家分享了js实现带积分的弹球小游戏的具体代码，供大家参考，具体内容如下

注：如果小球与底部方块的角碰撞，积分可能有些许bug

<style>
#box {
width: 400px;
height: 400px;
border: 1px solid #000000;
margin: 50px auto;
position: relative;
}

#ball {
height: 60px;
width: 60px;
border-radius: 50％;
background-color: red;
position: absolute;
left: 0;
top: 0;
}

#block {
width: 100px;
height: 20px;
position: absolute;
left: 150px;
bottom: 0;
background-color: black;
}

#count {
color: #ff0000;
font-size: 18px;
position: absolute;
width: 20px;
height: 20px;
left: -20px;
top: 0;
}
</style>

<body>
<div id="box">
<div id="count">0</div>
<div id="ball"></div>
<div id="block"></div>
</div>
</body>
<script>
var oBox = document.querySelector('#box');
var oBall = document.querySelector('#ball');
var oBlock = document.querySelector('#block');
var oCount = document.querySelector('#count');

var speedBlock = 5;
var speedX = 5;
var speedY = 4;

var maxLeft = oBox.clientWidth - oBall.offsetWidth;
var maxTop = oBox.clientHeight - oBall.offsetHeight;
var max = oBox.clientWidth - oBlock.offsetWidth;

setInterval(function () {
var left = oBall.offsetLeft;
var top = oBall.offsetTop;

left += speedX;
top += speedY;

if (left < 0 || left > maxLeft) {
speedX = -speedX;
}

if (top < 0) {
speedY *= -1;
}

var r = oBall.offsetWidth / 2;

if (left >= oBlock.offsetLeft - r && // 左边线碰撞条件
left <= oBlock.offsetLeft - r + oBlock.offsetWidth && // 右边线碰撞条件
top >= maxTop - oBlock.offsetHeight // 下边线碰撞条件
) {
// console.log('撞上了');
speedY = -Math.abs(speedY);
// speedY *= -1;
oCount.innerHTML = oCount.innerHTML * 1 + 1;
}

if (top > maxTop) {
left = 0;
top = 0;
}

oBall.style.left = left + 'px';
oBall.style.top = top + 'px';

}, 50);

document.onkeydown = function (e) {
var ev = event || e;
var keyCode = ev.keyCode || ev.which;

var left = oBlock.offsetLeft;

if (keyCode === 37) {
left -= speedBlock;
}
if (keyCode === 39) {
left += speedBlock;
}

if (left <= 0) {
left = 0
}

if (left >= max) {
left = max;
}

oBlock.style.left = left + 'px';
}
</script>

来源：https://blog.csdn.net/Ga_b_c/article/details/107452362

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js实现带积分弹球小游戏

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