m站设置锚点跳转到指定位置

        gotoAnchor:function(options){
            var anchor = options.el;
            var $body = window.document.documentElement;
            var ua = navigator.userAgent.toLowerCase();
            if (ua.indexOf("webkit") > -1) {
                $body = window.document.body;
            }
            var pos = anchor.offset();
            $body.scrollTop = pos.top - 50;
        }

调用：

$(".link1").click(function(){
                that.gotoAnchor({el:$('#top1')});
            })