Javascript实现的分页函数

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我是靠谱客的博主还单身秀发，最近开发中收集的这篇文章主要介绍Javascript实现的分页函数，觉得挺不错的，现在分享给大家，希望可以做个参考。

概述

From: IECN.Net ; Author: 钟钟

/**
* 分页类构造
* 参数 nTotalList: 总条数
* 参数 nPageSize: 每页显示条数
* 参数 nPageNum: 当前页码
* 参数 sPageUrl: 分页链接的URL，页码以[pn]代替，输出时将被替换为实际页码
* 参数 nPageListSize: 页码列表（下拉框）中显示的最多页码条数。该参数可省略，默认100
*/
function Pagination(nTotalList, nPageSize, nPageNum, sPageUrl, nPageListSize) {
  this.totalList = nTotalList;
  this.pageSize = nPageSize;
  this.pageNum = nPageNum;
  if (nTotalList == 0)
    this.totalPages = 1;
  else
    this.totalPages = Math.floor((this.totalList-1)/this.pageSize + 1);
  this.pageUrl = sPageUrl;
  if (arguments[4])
    this.pageListSize = nPageListSize;
  else
    this.pageListSize = 100;
}

/**
* 生成分页，将HTML直接输出
* 无参数
* 无返回值
*/
Pagination.prototype.generate = function() {
  var output = "";
  output += "<table width="98%" cellspacing="1" cellpadding="3" align="center"><tr><td align="right">";
  output += "共 " + this.totalList + " 条每页 " + this.pageSize + " 条当前第 ";
  output += "<select onchange="if(this.value)location.href='" + this.pageUrl + "'.replace(/\[pn\]/,";
  output += "this.value);" align="absMiddle" style="font:normal 9px Verdana,Arial,宋体;">";
  var firstPage = this.pageNum - Math.floor(this.pageListSize/2);
  if (firstPage < 1)
    firstPage = 1;
  var lastPage = firstPage + this.pageListSize - 1;
  if (lastPage > this.totalPages) {
    lastPage = this.totalPages;
    firstPage = lastPage - this.pageListSize + 1;
    if (firstPage < 1)
      firstPage = 1;
  }
  if (firstPage > 1) {
    output += "<option value="1">1</option>";
    if (firstPage > 2)
      output += "<option value="">…</option>";
  }
  for (var p = firstPage; p <= lastPage; p++) {
    output += "<option value="" + p + """;
    if (p == this.pageNum)
      output += " selected="yes"";
    output += ">" + p + "</option>";
  }
  if (lastPage < this.totalPages) {
    if (lastPage < this.totalPages - 1)
      output += "<option value="">…</option>";
    output += "<option value="" + this.totalPages + "">" + this.totalPages + "</option>";
  }
  if (this.pageNum > this.totalPages)
    output += "<option value="" selected="yes">页码超出范围</option>";
  output += "</select>";
  output += "/" + this.totalPages + " 页 ";
  if (this.pageNum == 1) {
    output += "[首页] ";
    output += "[上页] ";
  }
  else {
    output += "<a href="" + this.pageUrl.replace(/[pn]/, "1") + "">[首页]</a> ";
    output += "<a href="" + this.pageUrl.replace(/[pn]/, this.pageNum-1) + "">[上页]</a> ";
  }
  if (this.pageNum == this.totalPages) {
    output += "[下页] ";
    output += "[尾页]";
  }
  else {
    output += "<a href="" + this.pageUrl.replace(/[pn]/, this.pageNum+1) + "">[下页]</a> ";
    output += "<a href="" + this.pageUrl.replace(/[pn]/, this.totalPages) + "">[尾页]</a> ";
  }
  output += "</td></tr></table>";
  document.writeln(output);
}