jquery实现锚点链接平滑效果

在html页面加上锚点链接后写上以下js代码：

   $(function(){
        $('a[href*=#],area[href*=#]').click(function() {
            if (location.pathname.replace(/^\//, '') == this.pathname.replace(/^\//, '') && location.hostname == this.hostname) {
                var $target = $(this.hash);
                $target = $target.length && $target || $('[name=' + this.hash.slice(1) + ']');
                if ($target.length) {
                    var targetOffset = $target.offset().top;
                    $('html,body').animate({
                            scrollTop: targetOffset
                        },
                        1000);
                    return false;
                }
            }
        });
    })