页码显示jquery插件,只需要存在#pageNav,则会在其中显示页码.
调用时可根据需要先重写go方法.(已去除jquery依赖)

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示例(注意：页面中放置id为pageNav的html对象):

//转到页码时触发的自定义方法,p为当前页码,pn为总页数
pageNav.fn = function(p,pn){
alert(p+","+pn);
};
//初始跳到第3页,共33页
pageNav.go(3,33);

*/
var pageNav = pageNav || {};
pageNav.fn = null;
//p为当前页码,pn为总页数
pageNav.nav = function(p, pn) {
//只有一页,直接显示1
if (pn <= 1) {
this.p = 1;
this.pn = 1;
return this.pHtml2(1);
}
if (pn < p) {
p = pn;
};
var re = "";
//第一页
if (p <= 1) {
p = 1;
} else {
//非第一页
re += this.pHtml(p - 1, pn, "上一页");
//总是显示第一页页码
re += this.pHtml(1, pn, "1");
}
//校正页码
this.p = p;
this.pn = pn;

//开始页码
var start = 2;
var end = (pn < 9) ? pn: 9;
//是否显示前置省略号,即大于10的开始页码
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 += "...";
//显示最后一页页码,如不需要则去掉下面这一句
re += this.pHtml(pn, pn);
};
if (p < pn) {
re += this.pHtml(p + 1, pn, "下一页");
};
return re;
};
//显示非当前页
pageNav.pHtml = function(pageNo, pn, showPageNo) {
showPageNo = showPageNo || pageNo;
var H = " <a href='javascript:pageNav.go(" + pageNo + "," + pn + ");' class='pageNum'>" + showPageNo + "</a> ";
return H;

};
//显示当前页
pageNav.pHtml2 = function(pageNo) {
var H = " <span class='cPageNum'>" + pageNo + "</span> ";
return H;
};
//输出页码,可根据需要重写此方法
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);
};
};