jquery - 菜单指针通过滚动动画

Question

我制作了一个顶部菜单，按钮下方有一个小箭头。我希望此箭头相应地移动到我的一页设计中滚动条所在的位置。

我想我已经掌握了基础知识...但是不知何故，当我尝试为箭头设置动画时(而不是让它在按钮之间跳转)，它就会不停地翻转。我想这与多个 >=... 有关，但我想不出替代方案。谁能给我一些建议？

效果可以看这里:http://www.lightwavedesign.nl/

我使用的JS如下:

    function goToByScroll(id){
        $('html,body').animate({scrollTop: $("#"+id).offset().top-78},'1000');
    };

    window.onload = function() {
      var link1 = $("#Welkom"); var positionLink1 = link1.position();
      var link2 = $("#OverMij"); var positionLink2 = link2.position();
      var link3 = $("#Portfolio"); var positionLink3 = link3.position();
      var link4 = $("#Contact"); var positionLink4 = link4.position();

      function getScrollTop() {
        if (typeof window.pageYOffset !== 'undefined' ) {return window.pageYOffset;}
        var d = document.documentElement;
        if (d.clientHeight) {return d.scrollTop;}
        return document.body.scrollTop;
      }

      window.onscroll = function() {
        var box = document.getElementById('menuAanwijzer'),
        scroll = getScrollTop();
        if (scroll <= positionLink2.top) {$('#menuAanwijzer').animate({left: '665px'}, 100)}
        if (scroll >= positionLink2.top-80) {$('#menuAanwijzer').animate({left: '760px'}, 100)}
        if (scroll >= positionLink3.top-80) {$('#menuAanwijzer').animate({left: '860px'}, 100)}
        if (scroll >= positionLink4.top-80) {$('#menuAanwijzer').animate({left: '960px'}, 100)}
        if (scroll >= positionLink2.top-80) {$('#menuTitel').fadeIn('500');}
        if (scroll <= positionLink2.top-80) {$('#menuTitel').fadeOut('500');}

      };
    };

Answer 1

很简单，使用 .stop() 清除动画队列
.stop().animate()

    if (scroll <= positionLink2.top) {$('#menuAanwijzer').stop().animate({left: '665px'}, 100)}
    if (scroll >= positionLink2.top-80) {$('#menuAanwijzer').stop().animate({left: '760px'}, 100)}
    if (scroll >= positionLink3.top-80) {$('#menuAanwijzer').stop().animate({left: '860px'}, 100)}
    if (scroll >= positionLink4.top-80) {$('#menuAanwijzer').stop().animate({left: '960px'}, 100)}
    if (scroll >= positionLink2.top-80) {$('#menuTitel').stop().fadeIn('500');}
    if (scroll <= positionLink2.top-80) {$('#menuTitel').stop().fadeOut('500');}