JS实现前端动态分页码代码实例

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思路分析：有3种情况

第一种情况，当前页面curPage < 4

第二种情况，当前页面curPage == 4

第三种情况，当前页面curPage>4

此外，还要考虑，当前页码 curPage < pageTotal（总页码）-2，才显示 ...

首先，先是前端的布局样式

<body>
   /*首先，在body中添加div id="pagination" */
   <div id="pagination">
<!-- 后面会在JS中动态追加 ，此处为了，实现前端效果，所以注册
<a id="prevBtn"><</a>
<a id="first">1</a>
<a href="#" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >2</a>
<a href="#" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >3</a>
<a href="#" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >4</a>
<span>...</span>
<a href="#" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" id="last">10</a>
<a href="#" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" id="nextBtn">></a>
-->

   </div>
</body>

其次，是css代码

*{
      margin: 0;
      padding: 0;
    }
    #pagination{
      width: 500px;
      height: 100px;
      border: 2px solid crimson;
      
      margin: 50px auto ;
      padding-top: 50px ;
      padding-left: 50px;
    }
    
    .over,.pageItem{
      float: left;
      display: block;
      width: 35px;
      height: 35px;
      line-height: 35px;
      text-align: center;
    }
    
    .pageItem{
      border: 1px solid orangered;
      text-decoration: none;
      color: dimgrey;
      margin-right: -1px;/*解决边框加粗问题*/
    }
    .pageItem:hover{
      background-color: #f98e4594;
      color:orangered ;
    }
    .clearfix{
      clear: both;
    }
    .active{
      background-color: #f98e4594;
      color:orangered ;
    }
    .banBtn{
      border:1px solid #ff980069;
      color: #ff980069;
    }
    #prevBtn{
      margin-right: 10px;
    }
    #nextBtn{
      margin-left: 10px;
    }

JavaScript代码

<script type="text/javascript">
  
  var pageOptions = {pageTotal:10,curPage:7,paginationId:''};
  dynamicPagingFunc(pageOptions);
  
  function dynamicPagingFunc(pageOptions){
    var pageTotal = pageOptions.pageTotal || 1;
    var curPage = pageOptions.curPage||1;
    var doc = document;
    var paginationId = doc.getElementById(''+pageOptions.paginationId+'') || doc.getElementById('pagination');
    var html = '';
    if(curPage>pageTotal){
      curPage =1;
    }
    /*总页数小于5，全部显示*/
    if(pageTotal<=5){
      html = appendItem(pageTotal,curPage,html);
      paginationId.innerHTML = html;
    }
    /*总页数大于5时，要分析当前页*/
    if(pageTotal>5){
      if(curPage<=4){
        html = appendItem(pageTotal,curPage,html);
        paginationId.innerHTML = html;
      }else if(curPage>4){
        html = appendItem(pageTotal,curPage,html);
        paginationId.innerHTML = html;
      }
    }
  }
  
  function appendItem(pageTotal,curPage,html){
    var starPage = 0;
    var endPage = 0;
    
    html+='<a id="prevBtn">&lt;</a>';
    
    if(pageTotal<=5){
      starPage = 1;
      endPage = pageTotal;  
    }else if(pageTotal>5 && curPage<=4){
      starPage = 1;
      endPage = 4;
      if(curPage==4){
        endPage = 5;
      }
    }else{
      if(pageTotal==curPage){
        starPage = curPage-3;
        endPage = curPage;
      }else{
        starPage = curPage-2;
        endPage = curPage+1;
      }
      html += '<a id="first">1</a><span>...</span>';
    }
    
    for(let i = starPage;i <= endPage;i++){
      if(i==curPage){
        html += '<a id="first">'+i+'</a>';
      }else{
        html += '<a href="#" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >'+i+'</a>';
      }
    }
    
    if(pageTotal<=5){
      html+='<a href="#" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" id="nextBtn">&gt;</a>';
    }else{
      if(curPage<pageTotal-2){ 
        html += '<span>...</span>';
      }
      if(curPage<=pageTotal-2){
        html += '<a href="#" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >'+pageTotal+'</a>';
      }
      html+='<a href="#" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" id="nextBtn">&gt;</a>';
    }
    return html;
  }
  
</script>

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