本文实例讲述了JavaScript分页功能的实现方法。分享给大家供大家参考。具体实现方法如下：
<script>//定义page为全局变量，以便下面使用var page;window.onload = function() {var table = document.getElementById("table");var btnAdd = document.getElementById("btnAdd");var btnModify = document.getElementById("btnModify");var btnDel = document.getElementById("btnDel");var btnRefresh = document.getElementById("btnRefresh");var headCheck = document.getElementById("headCheck");//定义每页的页数及初始化table和tbody的idpage = new Page(5, 'table', 'sTBodyId');//初始加载init方法page.__init__();//初始更新表格page.__updateTableRows__();}//下面的所有方法，均写到window.onload之外，否则运行有问题function Page(iAbsolute, sTableId, sTBodyId) {//每页显示数据的条数this.absolute = iAbsolute; this.tableId = sTableId;this.tBodyId = sTBodyId;this.rowCount = 0;//记录数this.pageCount = 0;//页数this.pageIndex = 0;//页索引this.__oTable__ = null;//表格引用this.__oTBody__ = null;//要分页内容this.__dataRows__ = 0;//记录行引用this.__oldTBody__ = null;}//初始化Page.prototype.__init__ = function() {//获取table引用this.__oTable__ = document.getElementById(this.tableId);//获取tBody引用this.__oTBody__ = this.__oTable__.tBodies[this.tBodyId];//获取tbody的行this.__dataRows__ = this.__oTBody__.rows;//获取tbody的总行数this.rowCount = this.__dataRows__.length;try {//判断初始化时每页显示的数据条数，如果定义的值<0或者定义的值>本来就有的行数，那么初始化时显示本来的行数，否则为当前定义的行数this.absolute = (this.absolute <= 0)|| (this.absolute > this.rowCount) ? this.rowCount: this.absolute;//定义初始化时该显示几页数据，也就是总页数this.pageCount = parseInt(this.rowCount % this.absolute == 0 ? this.rowCount/ this.absolute: this.rowCount / this.absolute + 1);} catch (exception) {}}//下一页Page.prototype.nextPage = function() {if (this.pageIndex + 1 < this.pageCount) {this.pageIndex += 1;this.__updateTableRows__();}}//上一页Page.prototype.prePage = function() {if (this.pageIndex >= 1) {this.pageIndex -= 1;this.__updateTableRows__();}}//首页Page.prototype.firstPage = function() {if (this.pageIndex != 0) {this.pageIndex = 0;this.__updateTableRows__();}}//尾页Page.prototype.lastPage = function() {if (this.pageIndex + 1 != this.pageCount) {this.pageIndex = this.pageCount - 1;this.__updateTableRows__();}}//页定位方法Page.prototype.aimPage = function(iPageIndex) {if (iPageIndex > this.pageCount - 1) {this.pageIndex = this.pageCount - 1;} else if (iPageIndex < 0) {this.pageIndex = 0;} else {this.pageIndex = iPageIndex;}this.__updateTableRows__();}//执行分页时，更新显示表格内容Page.prototype.__updateTableRows__ = function() {//pageIndex初始化时为0//每页显示的数据*当前页的索引var iCurrentRowCount = this.absolute * this.pageIndex;//如果截止到当前页的所有数据+每页显示的数据>总数据条数，则还需要显示this.absolute+ iCurrentRowCount - this.rowCount这些数据，否则，显示0条数据var iMoreRow = this.absolute + iCurrentRowCount > this.rowCount ? this.absolute+ iCurrentRowCount - this.rowCount: 0;var tempRows = this.__cloneRows__();//alert(tempRows === this.dataRows);//alert(this.dataRows.length);//将tbody从table中移除var removedTBody = this.__oTable__.removeChild(this.__oTBody__);//重新创建tbodyvar newTBody = document.createElement("TBODY");//给他赋一个id值，为原来的id值newTBody.setAttribute("id", this.tBodyId);for (var i = iCurrentRowCount; i < this.absolute + iCurrentRowCount- iMoreRow; i++) {//重新给body添加节点newTBody.appendChild(tempRows[i]);}//将新创建的tbody加到table中this.__oTable__.appendChild(newTBody);/* this.dataRows为this.oTBody的一个引用，移除this.oTBody那么this.dataRows引用将销失, code:this.dataRows = tempRows;恢复原始操作行集合.*/this.__dataRows__ = tempRows;this.__oTBody__ = newTBody;}//克隆原始操作行集合Page.prototype.__cloneRows__ = function() {var tempRows = [];//将当前body中的所有节点及其子节点都克隆一遍for (var i = 0; i < this.__dataRows__.length; i++) {tempRows[i] = this.__dataRows__[i].cloneNode(1);}return tempRows;}</script></head><body><!-- 这里有一个表格，内容随意，供分页使用 --><table width="100%" cellpadding="0" cellspacing="0" border="1"style="padding: 2"><tr><td colspan="3" align="center">总共：<%=connDataList.size()%>条记录 每页显示5条 <a href="javascript:void(0);"onclick="page.firstPage();return false;">首页</a> <ahref="javascript:void(0);" onclick="page.prePage();return false;">上一页</a><a href="javascript:void(0);"onclick="page.nextPage();return false;">下一页</a> <ahref="javascript:void(0);" onclick="page.lastPage();return false;">尾页</a><span id="pageindex"></span></td></tr></table></body></html>希望本文所述对大家的javascript程序设计有所帮助。
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