/* ************************** author:Keel (keel.sike@gmail.com) ************************** 頁碼顯示jquery插件,只需要存在#pageNav,則會在其中顯示頁碼. 調用時可根據需要先重寫go方法.(已去除jquery依賴) ************************** 示例(注意：頁面中放置id為pageNav的html對象): //轉到頁碼時觸發的自定義方法,p為當前頁碼,pn為總頁數 pageNav.fn = function(p,pn){ alert(p+","+pn); }; //初始跳到第3頁,共33頁 pageNav.go(3,33); */var pageNav = pageNav || {};pageNav.fn = null;//p為當前頁碼,pn為總頁數pageNav.nav = function(p, pn) {  //只有一頁,直接顯示1  if (pn <= 1) {    this.p = 1;    this.pn = 1;    return this.pHtml2(1);  }  if (pn < p) {    p = pn;  };  var re = "";  //第一頁  if (p <= 1) {    p = 1;  } else {    //非第一頁    re += this.pHtml(p - 1, pn, "上一頁");    //總是顯示第一頁頁碼    re += this.pHtml(1, pn, "1");  }  //校正頁碼  this.p = p;  this.pn = pn;  //開始頁碼  var start = 2;  var end = (pn < 9) ? pn: 9;  //是否顯示前置省略號,即大于10的開始頁碼  if (p >= 7) {    re += "...";    start = p - 4;    var e = p + 4;    end = (pn < e) ? pn: e;  }  for (var i = start; i < p; i++) {    re += this.pHtml(i, pn);  };  re += this.pHtml2(p);  for (var i = p + 1; i <= end; i++) {    re += this.pHtml(i, pn);  };  if (end < pn) {    re += "...";    //顯示最后一頁頁碼,如不需要則去掉下面這一句    re += this.pHtml(pn, pn);  };  if (p < pn) {    re += this.pHtml(p + 1, pn, "下一頁");  };  return re;};//顯示非當前頁pageNav.pHtml = function(pageNo, pn, showPageNo) {  showPageNo = showPageNo || pageNo;  var H = " <a href='javascript:pageNav.go(" + pageNo + "," + pn + ");' class='pageNum'>" + showPageNo + "</a> ";  return H;};//顯示當前頁pageNav.pHtml2 = function(pageNo) {  var H = " <span class='cPageNum'>" + pageNo + "</span> ";  return H;};//輸出頁碼,可根據需要重寫此方法pageNav.go = function(p, pn) {  //$("#pageNav").html(this.nav(p,pn)); //如果使用jQuery可用此句  document.getElementById("pageNav").innerHTML = this.nav(p, pn);  if (this.fn != null) {    this.fn(this.p, this.pn);  };};