JavaScript实现前端分页控件

function pagination(obj){    /*pageIndex: index,pageSize: size,count:   count,  container: container,fn  :   fn     */    if(!obj||typeof obj!="object"){        return false;    }    var pageIndex= obj.pageIndex||1,      pageSize=obj.pageSize||10,      count= obj.count||0,      container= obj.container,      callback=obj.fn||function(){};    var pageCount =Math.ceil(count/pageSize);     if(pageCount==0){        return false ;    }      if(pageCount<pageIndex){        return false;    }    /*事件绑定*/    function bindEvent(){        //上一页事件        $(container).find(">ul>.pg-prev").unbind("click").bind("click",function(){                if(pageIndex <=1){                return false ;                }                if(typeof callback=="function"){                pageIndex--;                pageIndex = pageIndex<1?1:pageIndex;                obj.pageIndex= pageIndex;                callback(pageIndex);                pagination(obj);                }                });        //下一页事件        $(container).find(">ul>.pg-next").unbind("click").bind("click",function(){                if(pageIndex ==pageCount){                return false ;                }                if(typeof callback=="function"){                pageIndex++;                pageIndex =pageIndex >pageCount?pageCount:pageIndex;                obj.pageIndex= pageIndex;                callback(pageIndex);                pagination(obj);                }                });        $(container).find(">ul>li:not(.pg-more):not(.pg-prev):not(.pg-next)").unbind("click").bind("click",function(){                pageIndex= +$(this).html();                pageIndex = isNaN(pageIndex)?1:pageIndex;                obj.pageIndex= pageIndex;                if(typeof callback=="function"){                callback(pageIndex);                pagination(obj);                }                });    };    /*画样式*/    function printHead(){        var html=[];        html.push('<li class="pg-prev '+(pageIndex==1?"pg-disabled":"")+'">上一页</li>');        return html.join("");    }    function printBody(){        var html=[];        var render=function(num,start){            start=start||1;            for(var i=start;i<=num;i++){                html.push('<li class="'+(pageIndex==i?"pg-on":"")+'">'+i+'</li>');            }        }        if(pageCount<=7){            render(pageCount);        }else{            if(pageIndex <4){                render(4);                html.push('<li class="pg-more">...</li>');                html.push('<li >'+pageCount+'</li>');                }else{                html.push('<li >1</li>');                  html.push('<li class="pg-more">...</li>');                if(pageCount-pageIndex>3){                    render(pageIndex+1,pageIndex-1);                    html.push('<li class="pg-more">...</li>');                    html.push('<li >'+pageCount+'</li>');                }else{                    render(pageCount,pageCount-3);                }            }        }        return html.join("");    }    function printTail(){        var html=[];        html.push('<li class="pg-next '+(pageIndex==pageCount?"pg-disabled":"")+'">下一页</li>');        return html.join("");    }    function show(){        container.innerHTML= '<ul>'+printHead()+printBody()+printTail()+'</ul>';    }    show();    bindEvent();}