(编辑：jimmy 日期: 2024/11/15 浏览：2)
九宫格算法核心：
公式：
行 row=parseInt(i/cols);
列 col=parseInt(i%cols);
i是当前的盒子，cols是总列数，
代码示例：
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>九宫格</title>
<style>
*{
padding: 0;
margin: 0;
}
#top{
margin-top:30px;
margin-bottom: 20px;
margin-left:20px;
}
#bottom{
position: relative;
}
#bottom .content{
width: 220px;
height: 360px;
background-color: skyblue;
margin: 0 0 15px 15px;
padding: 5px;
}
.content img{
width: 220px;
height: 308px;
}
#bottom .content p:last-child{
font-size: 15px;
color: red;
}
</style>
</head>
<body>
<div id="top">
<button>排成三列</button>
<button>排成四列</button>
<button>排成五列</button>
</div>
<div id="bottom">
<div class="content">
<img src="/UploadFiles/2021-04-02/dianying.jpg">
九宫格（用原生js实现）
1、本文的九宫格是用原生的js实现的；
2、实现的九宫格效果是：可交换1-9的任意方格，且将方格拖拽至大盒子外松开后可自动回到拖拽之前的位置。
3、代码如下：
html代码：
<ul id="box">
<li>1</li>
<li>2</li>
<li>3</li>
<li>4</li>
<li>5</li>
<li>6</li>
<li>7</li>
<li>8</li>
<li>9</li>
</ul>
css代码：
body,div,p,h1,h2,h3,h4,h5,h6,ol,ul,li,dl,dt,dd,th,tr,td,hr,caption,table,form,img,input,legend,fieldset{
margin:0;
padding:0;
}
html {
overflow: hidden;
}
ul {
list-style: none;
}
#box {
position: relative;
margin: 20px auto;
width: 640px;
height: 640px;
border: 1px solid #eee;
}
#box li {
position: absolute;
width: 200px;
height: 200px;
line-height: 200px;
text-align: center;
font-size: 40px;
font-weight: bold;
background: #eee;
}
#box .active {
z-index: 1;
color: #fff;
background: blue;
}
js代码：
window.onload = function () {
var oBox = document.getElementById('box');
var aLi = oBox.children;
for(var i = 0; i < aLi.length; i++) {
// 布局
aLi[i].style.left = 210 * (i % 3) + 10 + 'px';
aLi[i].style.top = 210 * Math.floor(i / 3) + 10 + 'px';
// 添加拖拽功能
aLi[i].index = i;
aLi[i].onmousedown = function (ev) {
var e = ev || window.event;
var iX = e.clientX - this.offsetLeft;
var iY = e.clientY - this.offsetTop;
if(this.setCapture) {
this.setCapture();
}
var oThat = this;
// 添加class名称
this.className = 'active';
document.onmousemove = function (ev) {
var e = ev || window.event;
var iL = e.clientX - iX;
var iT = e.clientY - iY;
oThat.style.left = iL + 'px';
oThat.style.top = iT + 'px';
// 交换位置的条件
for(var j = 0; j < aLi.length; j++) {
if(oThat != aLi[j]
&& oThat.offsetLeft + oThat.offsetWidth > aLi[j].offsetLeft + aLi[j].offsetWidth / 2
&& oThat.offsetTop + oThat.offsetHeight > aLi[j].offsetTop + aLi[j].offsetHeight / 2
&& oThat.offsetLeft < aLi[j].offsetLeft + aLi[j].offsetWidth / 2
&& oThat.offsetTop < aLi[j].offsetTop + aLi[j].offsetHeight / 2) {
var iCurIndex = oThat.index;
// 交换位置
aLi[j].style.left = 210 * (iCurIndex % 3) + 10 + 'px';
aLi[j].style.top = 210 * Math.floor(iCurIndex / 3) + 10 + 'px';
// 交换下标
oThat.index = aLi[j].index;
aLi[j].index = iCurIndex;
break;
}
}
};
document.onmouseup = function () {
document.onmousemove = null;
document.onmouseup = null;
if(oThat.releaseCapture) {
oThat.releaseCapture();
}
// 去掉class名称
oThat.className = '';
// 重置当前拖拽元素的位置
oThat.style.left = 210 * (oThat.index % 3) + 10 + 'px';
oThat.style.top = 210 * Math.floor(oThat.index / 3) + 10 + 'px';
};
return false;
};
}
};
以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持。