多个不同高度的固定导航栏的平滑滚动

Smooth scroll for multiple fixed navbar with different height

我有一个固定顶部的导航栏(75 像素高),滚动流畅,非常适合桌面。当我在小屏幕上时,我有一个不同的导航栏(50px 高度),高度更小,所以锚点 dosent 到达正确的位置。

// Smooth Scoll
$('a[href*="#"]')
    .not('[href="#"]')
    .not('[href="#0"]')
.click(function(event) {
       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) {
               event.preventDefault();
               $('html, body').animate({
                   scrollTop: target.offset().top -75
               }, 1200, function() {
                   var $target = $(target);
                   $target.focus();
                   if ($target.is(":focus")) {
                       return false;
                   } else {
                       $target.attr('tabindex','-1');
                       $target.focus();
                   };
               });
           }
       }
});

我希望能够根据单击的导航栏设置 target.offset().top。没有 css 解决方案。

添加屏幕宽度检查并将 75 更改为 50

// Smooth Scoll
$('a[href*="#"]').not('[href="#"]') .not('[href="#0"]').click(function(event) {
       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) {
               event.preventDefault();
               $('html, body').animate({

                // change dependant on screen width
                if ($(window).width() < 960) { // set in px
                    scrollTop: target.offset().top -50
                } else {
                   scrollTop: target.offset().top -75
                }          

               }, 1200, function() {
                   var $target = $(target);
                   $target.focus();
                   if ($target.is(":focus")) {
                       return false;
                   } else {
                       $target.attr('tabindex','-1');
                       $target.focus();
                   };
               });
           }
       }
});

或者你可以,这可能更好地获得点击时的导航高度

//set nav 
var nav = $('.nav-bar'); // update to your nav class

// Smooth Scoll
$('a[href*="#"]').not('[href="#"]').not('[href="#0"]').click(function(event) {

    // get nav height
    var NavHeight = nav.height();

       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) {
               event.preventDefault();
               $('html, body').animate({

                // minus nav height
                scrollTop: target.offset().top - NavHeight

               }, 1200, function() {
                   var $target = $(target);
                   $target.focus();
                   if ($target.is(":focus")) {
                       return false;
                   } else {
                       $target.attr('tabindex','-1');
                       $target.focus();
                   };
               });
           }
       }
});