返回顶部

//返回顶部js
		(function() {
		    var $backToTopTxt = "返回顶部", $backToTopEle = $('<div class="backToTop"></div>').appendTo($("body"))
		        .text($backToTopTxt).attr("title", $backToTopTxt).click(function() {
		            $("html, body").animate({ scrollTop: 0 }, 120);
		    }), $backToTopFun = function() {
		        var st = $(document).scrollTop(), winh = $(window).height();
		        (st > 0)? $backToTopEle.show(): $backToTopEle.hide();    
		        //IE6下的定位
		        if (!window.XMLHttpRequest) {
		            $backToTopEle.css("top", st + winh - 166);    
		        }
		    };
		    $(window).bind("scroll", $backToTopFun);
		    $(function() { $backToTopFun(); });
		})();

/*返回顶部样式*/
			.backToTop {
  			display: none;
    		width: 18px;
    		line-height: 1.2;
    		padding: 5px 0;
    		background-color: #000;
    		color: #fff;
    		font-size: 12px;
    		text-align: center;
    		position: fixed;
    		_position: absolute;
    		right: 10px;
    		bottom: 100px;
    		_bottom: "auto";
    		cursor: pointer;
    		opacity: .6;
    		filter: Alpha(opacity=60);
			}