/*!
* hscroll.js
* author: mr. huang
*
*/;
(function() {
	function hscroll(options) {
		var self = this;
		//$.extend(defaults, options);
		self = object.assign(self, {
			nav1: '', //导航栏
			nav2: '', //需要监听的内容
			check: ''
		}, options);
		self.init();
	}

	hscroll.prototype = {
		init: function() {
			var self = this,
				arr = [],
				kdiv = $(self.nav2);
			for(var i = 0; i < kdiv.length; i++) {
				arr.push($(kdiv[i]).offset().top);
			}
			self.sctopfun(arr);
			$(window).scroll(function(e) {
				self.sctopfun(arr);
			});
			$(self.nav1).click(function(e) {
				$('body,html').animate({
					scrolltop: arr[$(this).index()] + 'px'
				});
			});
		},
		sctopfun: function(arr) {
			var self = this;
			var scrolltop = document.body.scrolltop || document.documentelement.scrolltop || window.pageyoffset;
			var keys = 0,
				flag = true;
			for(var i = 0; i < arr.length; i++) {
				keys++;
				if(flag) {
					if(scrolltop >= arr[arr.length - keys] - 100) {
						$(self.nav1).eq(arr.length - keys).addclass(self.checkclass).siblings().removeclass(self.checkclass);
						flag = false;
					} else {
						flag = true;
					}
				}
			}
		}
	};
	window.hscroll = hscroll;
}());