原生JS实现分页效果1.0

不太完整，写的太急，等等加上完整注释，写起来还是有些难度的，写的有点水，后面再改进改进。

<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>原生JS实现分页效果</title>
<style>
body{
margin:100px 200px;
}
#page{
margin:20px 0;
}
#page>#pre,#page>#next{
display:inline-block;
height: 34px;
line-height:34px;
padding: 0 18px;
border: 1px solid #e1e2e3;
text-decoration:none;
}
.list{
display:inline-block;
}
.list a{
text-decoration:none;
padding:0 5px;
}
.list a.current{
color:red;
}
</style>
</head>
<body>
<section id="box"></section>
<div id="page">
<a href="javascript:;" id="pre">上一页</a>
<div class="list"></div>
<a href="javascript:;" id="next">下一页</a>
</div>
</body>
</html>
<script>
'use strict'
// 获取元素
let domBox = document.getElementById("box");
let domPage = document.getElementById("page");
let domPre = document.getElementById("pre");
let domNext = document.getElementById("next");
let domList = document.querySelector(".list");

// 模拟数据
let arrJson = [
'Content_1',
'Content_2',
'Content_3',
'Content_4',
'Content_5',
'Content_6',
'Content_7',
'Content_8',
'Content_9',
'Content_10'
];
let jsonLen = arrJson.length;

// 设置规则
let each = 3;
let page = Math.ceil(jsonLen / each);

// 设置内容
for(let i=0;i<each;i++){
let domP = '<p>'+ arrJson[i] +'</p>';
domBox.innerHTML += domP;
}

// 设置列表页数
for(let i=0;i<page;i++){
let domA = document.createElement('a');
domA.href = 'javascript:;';
domA.innerHTML = i + 1;
domList.insertBefore(domA,null);
}

// 切换页
domList.addEventListener('click',function(e){
let target = e.target;
let targetName = target.nodeName.toLocaleLowerCase();
if(targetName==='a'){
domBox.innerHTML = '';
if(target.innerHTML!=='1'){
if(target.innerHTML==='2'){
for(let i=0;i<each;i++){
let arrJsonCurrent = arrJson[i-1+(target.innerHTML*(each-1))];
if(arrJsonCurrent==null){break;}
let domP = '<p>'+ arrJsonCurrent +'</p>';
domBox.innerHTML += domP;
}
}else if(target.innerHTML==='3'){
for(let i=0;i<each;i++){
let arrJsonCurrent = arrJson[i+(target.innerHTML*(each-1))];
if(arrJsonCurrent==null){break;}
let domP = '<p>'+ arrJsonCurrent +'</p>';
domBox.innerHTML += domP;
}
}else{
for(let i=0;i<each;i++){
let arrJsonCurrent = arrJson[i + (target.innerHTML-each) +(target.innerHTML*(each-1))];
if(arrJsonCurrent==null){break;}
let domP = '<p>'+ arrJsonCurrent +'</p>';
domBox.innerHTML += domP;
}
}
}else{
for(let i=0;i<each;i++){
let arrJsonCurrent = arrJson[i];
if(arrJsonCurrent==null){break;}
let domP = '<p>'+ arrJsonCurrent +'</p>';
domBox.innerHTML += domP;
}
}
}
})
</script>

算法