<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
<style>
* {
margin: 0px;
padding: 0px;
}
.main {
width: 1200px;
margin: 0px auto;
}
button {
margin: 10px 10px;
}
ul,
li {
list-style-type: none;
}
ul {
position: relative;
}
li {
width: 50px;
height: 50px;
background-color: red;
color: white;
font-size: 26px;
position: absolute;
text-align: center;
line-height: 50px;
}
</style>
</head>
<body>
<div class="main">
<button>自动生成一个V字形</button>
<ul>
</ul>
</div>
<script>
var ul = document.querySelector('ul');
var btn = document.querySelector('button');
btn.onclick = function() {
ul.innerHTML = '';
var num = Number(prompt('请输入您想组成V型的方块数'));
for (var i = 0; i < num; i++) {
var li = document.createElement('li');
ul.appendChild(li);
li.innerText = i;
}
var ulChild = ul.children;
var helfNum = Math.floor(num / 2);
for (var i = 0; i < num; i++) {
if (i < Math.ceil(num / 2)) {
ulChild[i].style.left = i * 50 + 'px';
ulChild[i].style.top = i * 50 + 'px';
} else {
ulChild[i].style.left = i * 50 + 'px';
ulChild[i].style.top = --helfNum * 50 + 'px';
}
}
}
</script>
</body>
</html>
标签：style,li,ul,num,自动,var,ulChild,div,生成 From： https://www.cnblogs.com/zhaofen/p/17115744.html