基于jquery实现简单的分页控件

/*分页控件v1.0 date:2015.08.26*/(function(window,$){  $.fn.pagination = function(options){    var _dftOpts = {      count:0,//总数      size:10,//每页数量      index:1,//当前页      lrCount:5,//当前页左右最多显示的数量      lCount:0,//最开始预留的数量      rCount:0,//最后预留的数量      first:"首页",      last:"尾页",      before:"上一页",      next:"下一页",           callback:null,//点击事件      beforeRender:null//项呈现前    };    $.extend(_dftOpts,options);    var count = _dftOpts.count;    if(count <= 0) return;    var _ellipsis = "...";    var _size = _dftOpts.size > 0 ? (_dftOpts.size > count ? count : _dftOpts.size) : 1;    var _page = Math.ceil(count / _size);    var _index = _dftOpts.index > 0 ? (_dftOpts.index > _page ? _page : _dftOpts.index) : 1;    var _lrcount = _dftOpts.lrCount * 2 + 1 > _page ? parseInt((_page - 1) / 2) : _dftOpts.lrCount;        var _continueCount = _lrcount * 2 + 1;    var _lCount = _dftOpts.lCount <= 0 ? 0 : (_dftOpts.lCount > _page ? _page - 1 : _dftOpts.lCount);    var _rCount = _dftOpts.rCount <= 0 ? 0 : (_dftOpts.rCount > _page ? _page - 1 : _dftOpts.rCount);    var _first = _dftOpts.first;    var _before = _dftOpts.before;    var _last = _dftOpts.last;    var _next = _dftOpts.next;    var _FromTo;    var _url = location.pathname + location.search + "#p";    var jthis = this;    var jPager = $("<div>",{"class":"pager"});        initJPager();        jthis.append(jPager);    regisiterEvent();    return jthis;         /*function*/        function initJPager(){      _FromTo = GetFromTo();      var from = _FromTo.from;      var to = _FromTo.to;      var before = _index <= 1 ? 1 : _index - 1;      var next = _index >= _page ? _page : _index + 1;      var beforeLast = _page - 1;      var jPrevs,jNexts;      var i;                //前         if(from === 2 && _lCount > 0){        appendLink(1);      }else if(from > _lCount + 1){        for(i = 0;i < _lCount;i++){          appendLink(i + 1);                  }        if(_lCount > 0){          appendEllipsis();        }      }else{                for(i = 1;i < from;i++){          appendLink(i);        }      }             //连续部分      for(i = from;i <= to;i++){        if(i === _index){                        appendLink(i,true);        }else{          appendLink(i);        }      }             //后      if(to === beforeLast && _rCount > 0){              appendLink(_page);      }else if(to < _page - _rCount){        if(_rCount > 0){          appendEllipsis();        }        for(i = _page - _rCount;i < _page;i++){          appendLink(i + 1);        }      }else{        for(i = to;i < _page;i++){          appendLink(i + 1);        }      }             appendFirstAndLast();    }    function GetFromTo(){      var from,to;      from = _index - _lrcount;      if(from <= 1){        return {from:1,to:_continueCount};      }      if(_page - _index < _lrcount){        from = _page - _continueCount + 1;                return {from:from,to:_page};      }      to = _index + _lrcount;      to = to > _page ? _page : to;          return {from:from,to:to};          }        function appendLink(index,active){      var jA = $("<a>",{text:index,href:_url+index});      if(active){        jA.addClass("active");      }      if(_dftOpts.beforeRender){        _dftOpts.beforeRender(jA);      }      jPager.append(jA);    }    function appendFirstAndLast(){      var jFirst = $("<a>",{text:_first});      var jBefore = $("<a>",{text:_before});      var jLast = $("<a>",{text:_last});      var jNext = $("<a>",{text:_next});      jPager.append(jNext).append(jLast);      jBefore.insertBefore(jPager.find("a").first());      jFirst.insertBefore(jBefore);      if(_index === 1){        jFirst.addClass("disabled");        jBefore.addClass("disabled");      }else{        jFirst.attr("href",_url+1);        jBefore.attr("href",_url+(_index-1));      }      if(_index === _page){        jLast.addClass("disabled");        jNext.addClass("disabled");      }else{        jLast.attr("href",_url+_page);                  jNext.attr("href",_url+(_index+1));      }         }    function appendEllipsis(){      jPager.append(_ellipsis);    }    //event    function regisiterEvent(){      jPager.on("mouseenter","a",function(){        var jthis = $(this);        if(!jthis.hasClass("active") && !jthis.hasClass("disabled")){          jthis.addClass("hover");        }      }).on("mouseout","a",function(){        var jthis = $(this);        if(!jthis.hasClass("active")){          jthis.removeClass("hover");        }      }).on("click","a",function(){        var jItem = $(this);        if(jItem.hasClass("disabled")){          return;        }        var text = jItem.text();        var index = 0;        switch(text){          case _first:            index = 1;            break;          case _before:            index = _index - 1;            break;          case _last:            index = _page;            break;          case _next:            index = _index + 1;            break;          default:            index = parseInt(text);            break;        }                var callback = _dftOpts.callback;        var newOpts;        _dftOpts.index = index;        jPager.remove();        if(callback){          newOpts = callback(_dftOpts);        }        if(newOpts){          _dftOpts = newOpts;        }        jthis.pagination(_dftOpts);              });               }  }})(window,$);

.pager{height:30px;line-height:30px;font-size: 12px;margin: 25px 0px;text-align: center;color: #2E6AB1;overflow: hidden;}.pager a{border:1px solid #9AAFE5;color:#2E6AB1;margin:0px 5px;padding:5px 8px;text-decoration: none;}.pager a.hover,.pager a.active{background-color:#2E6AB1;border-color:#000080;color:#FFF;}.pager a.disabled{color:#C8CDD2;cursor:auto;}

$(".div1").pagination({   count:200,   size:10,   index:1,   lrCount:3,   lCount:1,   rCount:1,        callback:function(options){     //alert(options.index);          //options.count = 300;     //return options;   },   beforeRender:function(jA){     //jA.attr("href","default.aspx?index="+jA.text());   }   });