/*
 
    author:  小鑫
    date:    2019/4/19
    qq:      857525554

 */
var xroll = function(el, fn) {
	xroll.prototype.init(el, fn)
};
xroll.prototype = {
	init: function(_el, fn) {
		_el.attr("data-state", false);
		this.start(_el, fn);
		$(window).on("scroll", function() {
			xroll.prototype.start(_el, fn)
		})
	},
	start: function(_el, fn) {
		var _this = this;
		$(_el).each(function() {
			var _self = $(this);
			var xrolltop = $(window).scrolltop();
			var iswindowheiget = $(window).height();
			if (_self.data().state) {
				return
			}
			if (xrolltop + iswindowheiget > $(this).offset().top) {
				fn();
				settimeout(function() {
					_self.attr("data-state", true);
					_self.data().state = true
				})
			}
		})
	}
};