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css - 如何在不使用幻数的情况下将这些 :before 元素居中？

问题描述

我正在制作一个四人连线游戏。现在每个 div.slot 上都有一个 :before 元素。这表示每个插槽中的切出圆。我将 top: 和 bottom: 属性设置为 7px 以使其居中。如果没有这些随机数，我该怎么办？我尝试将左、右、上、下设置为 0。但这无济于事。任何帮助都会很甜蜜。谢谢：）

const board = document.querySelectorAll(".slot");

for(let i = 0; i < board.length; i++) {
	board[i].addEventListener('click', selectColumn);
}

function selectColumn(evt) {
	let column = evt.target.id;
	let columnArray = [];

	for(let i=0; i < board.length; i++) {
		if(column === board[i].id) columnArray.push(board[i]);
	}
	dropChip(columnArray);
}

function dropChip(col) {
	for(let i = col.length-1; i >= 0; i--) {
		if(!col[i].classList.contains('filled')) {
			col[i].classList.add('filled');
			break;
		}
	}
	console.log(col);
}
/** {
	border: 1px solid red;
}*/

*, *:before, *:after {
	box-sizing: inherit;
}

html {
	box-sizing: border-box;
}

html, body {
	margin: 0;
	padding: 0;
}

body {
	display: flex;
	justify-content: flex-end;
	min-height: 100vh;
	background-color: #e6e9ef;
	flex-direction: column;
}

.board-wrapper {
	/*display: flex;*/
	margin: 0 auto;
	padding-top: 100px;
	position: relative;
	overflow: hidden;
}

.board {
	display: flex;
	background-color: #00c;
	/*background: #0000cc;*/
	flex-wrap: wrap;
	max-width: 706px;
	padding: 3px;
	/*margin: auto;*/
}

.board > div {
	width: 100px;
	height: 100px;
	background-color: blue;
	border: 3px solid #00c;
	cursor: pointer;
	position: relative;
}

.board > div:before {
	content: "";
	position: absolute;
	top: 7px;
	left: 7px;
	background-color: #00c;
	width: 80px;
	height: 80px;
	border-radius: 50%;
	box-shadow: inset 0px 0px 13px #0606aa;

}

.board > div.counter {
	/*display: block;
	padding: 0;*/
	position: absolute;
	top: 0;
	left: 0;
	right: 0;
	width: auto;
	height: 100px;
	border: none;
	background-color: #e6e9ef;
	/*z-index: 100;*/
}

.board > div.counter:after {
	content: "";
	display: block;
	/*padding: 0;*/
	height: 80px;
	width: 80px;
	background-color: red;
	top: 0;
	/*left: 0;
	right: auto;*/
	border-radius: 50%;
	transition: transform .5s ease, opacity .2s ease;
	/*transform: translateX(0);*/
	z-index: 100;
	opacity: 0;
}

.board > div.counter:before {
	/*content: "";
	display: block;
	padding: 0;*/
	position: absolute;
	top: 15px;
	left: 15px;
	/*right: auto;*/
	height: 50px;
	width: 50px;
	border-radius: 50%;
	background-color: red;
	box-shadow: inset 0px 0px 20px #cc0000;
	z-index: 101;
	transition: transform .5s ease, opacity .2s ease;
	/*transform: translateX(0);*/
	opacity: 0;
}

.board > div:nth-of-type(7n+1):hover ~ .counter:after{transform:translateX(14px);opacity: 1;}
.board > div:nth-of-type(7n+2):hover ~ .counter:after{transform:translateX(114px);opacity: 1;}
.board > div:nth-of-type(7n+3):hover ~ .counter:after{transform:translateX(214px);opacity: 1;}
.board > div:nth-of-type(7n+4):hover ~ .counter:after{transform:translateX(314px);opacity: 1;}
.board > div:nth-of-type(7n+5):hover ~ .counter:after{transform:translateX(414px);opacity: 1;}
.board > div:nth-of-type(7n+6):hover ~ .counter:after{transform:translateX(514px);opacity: 1;}
.board > div:nth-of-type(7n+7):hover ~ .counter:after{transform:translateX(614px);opacity: 1;}

.board > div:nth-of-type(7n+1):hover ~ .counter:before{transform:translateX(14px);opacity: 1;}
.board > div:nth-of-type(7n+2):hover ~ .counter:before{transform:translateX(114px);opacity: 1;}
.board > div:nth-of-type(7n+3):hover ~ .counter:before{transform:translateX(214px);opacity: 1;}
.board > div:nth-of-type(7n+4):hover ~ .counter:before{transform:translateX(314px);opacity: 1;}
.board > div:nth-of-type(7n+5):hover ~ .counter:before{transform:translateX(414px);opacity: 1;}
.board > div:nth-of-type(7n+6):hover ~ .counter:before{transform:translateX(514px);opacity: 1;}
.board > div:nth-of-type(7n+7):hover ~ .counter:before{transform:translateX(614px);opacity: 1;}
<!DOCTYPE html>
<html lang="en">
<head>
	<meta charset="UTF-8">
	<title>Connect Four</title>
	<link rel="stylesheet" href="style.css">
</head>
<body>
	<div class="board-wrapper">
		<div class="board">
			<div class="slot" id="col-1"></div>
			<div class="slot" id="col-2"></div>
			<div class="slot" id="col-3"></div>
			<div class="slot" id="col-4"></div>
			<div class="slot" id="col-5"></div>
			<div class="slot" id="col-6"></div>
			<div class="slot" id="col-7"></div>
			<div class="slot" id="col-1"></div>
			<div class="slot" id="col-2"></div>
			<div class="slot" id="col-3"></div>
			<div class="slot" id="col-4"></div>
			<div class="slot" id="col-5"></div>
			<div class="slot" id="col-6"></div>
			<div class="slot" id="col-7"></div>
			<div class="slot" id="col-1"></div>
			<div class="slot" id="col-2"></div>
			<div class="slot" id="col-3"></div>
			<div class="slot" id="col-4"></div>
			<div class="slot" id="col-5"></div>
			<div class="slot" id="col-6"></div>
			<div class="slot" id="col-7"></div>
			<div class="slot" id="col-1"></div>
			<div class="slot" id="col-2"></div>
			<div class="slot" id="col-3"></div>
			<div class="slot" id="col-4"></div>
			<div class="slot" id="col-5"></div>
			<div class="slot" id="col-6"></div>
			<div class="slot" id="col-7"></div>
			<div class="slot" id="col-1"></div>
			<div class="slot" id="col-2"></div>
			<div class="slot" id="col-3"></div>
			<div class="slot" id="col-4"></div>
			<div class="slot" id="col-5"></div>
			<div class="slot" id="col-6"></div>
			<div class="slot" id="col-7"></div>
			<div class="slot" id="col-1"></div>
			<div class="slot" id="col-2"></div>
			<div class="slot" id="col-3"></div>
			<div class="slot" id="col-4"></div>
			<div class="slot" id="col-5"></div>
			<div class="slot" id="col-6"></div>
			<div class="slot" id="col-7"></div>
			<div class="counter"></div>
		</div>
	</div>
	<script src="script.js"></script>
</body>
</html>

标签： css

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