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//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;
}
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