上一页，下一页渲染页面

##上一页，下一页渲染页面
首先是html：

<div id="pageNum"><button>1button><button>1button>  div><button onclick="first()">首页button><button onclick="perv()">上一页button><button onclick="next()">下一页button><button onclick="last()">末页button><ul id="ul">ul><p>共:<span id="pageSum">span>页当前:<span id="page">span>页p><button>下一页button>

下面是js：

 <script>var arr=["a","b","c","d","e","f","g","h",];var page=1;//页数var limit=2//每页显示条数function perv(){if(page>1){page-=1;var nowArr=arr.slice((page-1)*limit,page*limit)console.log(nowArr)}else{alert("这是首页")}}//这是下一页function next(){if(page<Math.ceil(arr.length/limit)){//页数page+=1;var nowArr=arr.slice((page-1)*limit,page*limit);console.log(nowArr)}else{alert("这是最后一页")}}//这是第一页function first(){page=1;var nowArr=arr.slice((page-1)*limit,page*limit);console.log(nowArr)}//这是最后一页function last(){page=Math.ceil(arr.length/limit);var nowArr=arr.slice((page-1)*limit,page*limit);console.log(nowArr)}window.onload=function(){var nowArr=arr.slice((page-1)*limit,page*limit);console.log(nowArr);var sum=Math.ceil(arr.length/limit);var str=""for(var i=1;i<=sum;i++){str+=`${i})">${i}`}document.getElementById("pageNum").innerHTML=str;}//点数字 1 2 3 页function numPage(i){page=i;var nowArr=arr.slice((page-1)*limit,page*limit);console.log(nowArr);}function showli(arr){var str="";for(let i=0;i<arr.length;i++){str+=`
${arr[i]}
`}document.getElementById("ul").innerHTML=str;}function pageSum(){return Math.ceil(arr.length/limit);}//当前第几页function nowPage(page){document.getElementById("page").innerText=page;}document.getElementById("pageSum").innerText=pageSum();</script>

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