$(function () {
				//瓒呰繃涓€瀹氶珮搴﹀鑸坊鍔犵被鍚
				var navs = $("#w_grid-1557388580790"); //寰楀埌瀵艰埅瀵硅薄  
     
				var win = $(window); //寰楀埌绐楀彛瀵硅薄  
				var scs = $(document); //寰楀埌document鏂囨。瀵硅薄銆  
				win.scroll(function () {
					if (scs.scrollTop() >= 100) {
						navs.addClass("on");
                
                      
					} else {
						navs.removeClass("on");
					}
				})