JavaScript实现列表分页功能特效

//总页数，当前页数，跳转地址，第一页和最后一页之间显示的页码数量function pageBar(tp,cp,url,pn){    var str = ‘<ul class=”page”>';    if(tp>1 && cp>1){      var prev = cp-1;      str += ‘<li><a class=”prev” title=”上一页” href=”javascript:goPage(‘+prev+‘,/”+url+‘/');”><span>上一页</span></a></li> ‘;    }else{      str += ‘<li><a class=”prev” title=”上一页” href=”javascript:void(0);”><span>上一页</span></a></li> ‘;    }    if(tp>1){      //第一页      if(cp==1){        str +=‘<li class=”current”><a href=”javascript:goPage(1,/”+url+‘/');”><span>1</span></a></li> ‘;      }else{        str +=‘<li><a href=”javascript:goPage(1,/”+url+‘/');”><span>1</span></a></li> ‘;      }      if(tp>2){        var pnh = Math.floor(pn/2);        //循环开始页码        var s = cp-pnh;        if(s<=1){          s = 2;        }        //循环结束页码        var e = cp+pnh;        if(e>=tp){          e = tp-1;        }        if(s<=(1+pnh)){          if(tp>(pn+2)){            e = s+(pn-1);            if(e>=tp){              e = tp-1;            }          }else{            s = 2;          }        }        if(e>=(tp-pnh)){          if(tp>(pn+2)){            s = e-(pn-1);            if(s<=1){              s = 2;            }          }else{            e = tp-1;          }        }        if(e<s){          e = s;        }        //第一页后的多页跳转        if(s>2){          var sp = cp-pn;          if(sp<1){            sp=1;          }          str += ‘<li><a name=”break” href=”javascript:goPage(‘+sp+‘,/”+url+‘/');”><span>…</span></a></li> ‘;        }        for(var i=s;i<=e;i++){          if(i==cp){            str += ‘<li class=”current”><a href=”javascript:goPage(‘+i+‘,/”+url+‘/');”><span>'+i+‘</span></a></li> ‘;          }else{            str += ‘<li><a href=”javascript:goPage(‘+i+‘,/”+url+‘/');”><span>'+i+‘</span></a></li> ‘;          }        }        //最后一页前的多页跳转        if(e < (tp-1)){          var ep = cp+pn;          if(ep>tp){            ep=tp;          }          str += ‘<li><a name=”break” href=”javascript:goPage(‘+ep+‘,/”+url+‘/');”><span>…</span></a></li> ‘;        }      }      //最后一页      if(cp==tp){        str +=‘<li class=”current”><a href=”javascript:goPage(‘+tp+‘,/”+url+‘/');”><span>'+tp+‘</span></a></li> ‘;      }else{        str +=‘<li><a href=”javascript:goPage(‘+tp+‘,/”+url+‘/');”><span>'+tp+‘</span></a></li> ‘;      }    }else{      str +=‘ <li class=”current”><a href=”javascript:void(0);”><span>1</span></a></li> ‘;    }    if(tp>1 && cp<tp){      var next = cp+1;      str += ‘<li><a class=”next” title=”下一页” href=”javascript:goPage(‘+next+‘,/”+url+‘/');”><span>下一页</span></a></li>';    }else{      str += ‘<li><a class=”next” title=”下一页” href=”javascript:void(0);”><span>下一页</span></a></li>';    }    str += ‘</ul>';    return str;  }  //跳转页码，跳转地址  function goPage(cp,url){    window.location.href = url+cp;  }