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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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