使用JavaScript实现的分页函数

/**
 * 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);
}

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