Detailed explanation of js paginator

/**
 * 分页器，依赖于bootstrap,jquery
 */
var pager = {
	init : function(r) {
		this.obj = $(".pj_pager");
		this.total = Number(this.obj.attr("pj_total"));
		this.rows = r != undefined ? r : 10;// Number(this.obj.find(.page-count).html())
		this.page = 1;
		this.initpagecount = 10;
		this.pages = parseInt(this.total / pager.rows)
				+ (pager.total % pager.rows > 0 ? 1 : 0);
		this.maxpages = this.pages > this.initpagecount ? this.initpagecount
				: this.pages;
		this.outnumber = this.pages > this.initpagecount ? true : false;
		this.start = 1;
		this.end = this.start + (this.maxpages - 1);
		this.html();
	},
	next : function() {
		this.obj.find(".pj_next").click(function() {
			if (pager.pages > pager.page) {
				pager.page++;
				pager.html();
			}
		});
	},
	prov : function() {
		this.obj.find(".pj_prov").click(function() {
			if (pager.page > 1) {
				pager.page--;
				pager.html();
			}
		});

	},
	first : function() {
		this.obj.find(".first").click(function() {
			if (pager.page != 1) {
				pager.page = 1;
				pager.html();
			}
		});
	},
	last : function() {
		this.obj.find(".last").click(function() {
			if (pager.page != pager.pages) {
				pager.page = pager.pages;
				pager.html();
			}
		});
	},
	jump : function() {
		this.obj.find(".jump").click(function() {
			var p = $(this).prev("input").val();
			if (p != '' && Number(p) <= pager.pages) {
				pager.page = Number(p);
				pager.html();
			}
		});
	},
	setOutnumber : function() {
		if (this.pages > this.initpagecount) {
			if (this.end < this.page || this.start > this.page) {
				this.start = parseInt((this.page - 1) / this.initpagecount)
						* this.initpagecount + 1;
				this.end = this.start + this.initpagecount - 1;
				if (this.pages - this.start < this.initpagecount) {
					this.outnumber = false;
					this.end = this.start + pager.total % pager.rows - 1;
				} else {
					this.outnumber = true;
				}
			}
		}
	},
	selectRows : function() {
		$(".dropdown-menu li").click(
				function() {
					// pager.rows = Number($(this).find("a").html());
					// pager.page = 1;
					pager.init(Number($(this).find("a").html()));
					$(this).parent("ul").prev("button").children("em").html(
							$(this).find("a").html());
				});
	},
	html : function() {

		this.setOutnumber();

		var html = '';
		html += ''
				+ this.rows + ' ';
		html += '
';
		html += '
10
20
30
40
50
100
';
		html += '
';
		html += '首页';
		html += '<<';
		if (this.pages > 0) {
			for (var i = this.start; i <= this.end; i++) {
				var cls = (i == this.page ? 'btn-success' : 'btn-default');
				html += '' + i
						+ '';
			}
			if (this.outnumber) {
				html += '...';
			}
		}
		html += '>>';
		html += '尾页';
		html += '';
		html += '跳转';
		html += ' ' + this.total
				+ '条';
		html += ' 共' + this.pages
				+ '页';
		this.obj.html(html);
		this.next();
		this.prov();
		this.first();
		this.last();
		this.jump();
		this.selectRows();
	}

}

$(function() {
	pager.init();
})