javascript - 向下/向上滚动时导航汉堡图标反复闪烁

Question

我想要一个汉堡图标动态改变颜色的代码，以适应网站的黑色部分/部分和白色。它最初是 3 段白色，js 代码几乎是好的和正确的，但是当它在白色部分时它一直闪烁，并在红色和白色之间闪烁。

js

var top2 = $('#section2').offset().top; //white background
var top3 = $('#section3').offset().top;
var top4 = $('#section4').offset().top; //white background
var top5 = $('#section5').offset().top;


$(window).scroll(function() {
  var scrollPos = $(window).scrollTop();
  var $nav = $("#toggle .span");
  if (scrollPos >= top2 && scrollPos <= top3) {
    $nav.toggleClass('scrolled');
  } else if (scrollPos >= top4 && scrollPos <= top5) {
    $nav.toggleClass('scrolled');
  } else {
    $nav.removeClass('scrolled');
  }
});

带有用于插入 js 类的媒体查询的 css #toggle .span.scrolled

 #toggle {
      position: fixed;
      right: 20px;
      top: 14px;
      z-index: 999;
      width: 40px;
      height: 40px;
      cursor: pointer;
      float: right;
      /* transition: all 0.3s ease-out; */
      visibility: hidden;
      opacity: 0;
    }

    #toggle .span {
      height: 3px;
      background: #fff;
      /* transition: all 0.3s ease-out; */
      backface-visibility: hidden;
      margin: 5px auto;
    }

#toggle.on #one {
  transform: rotate(45deg) translateX(2px) translateY(4px);
}

#toggle.on #two {
  opacity: 0;
}

#toggle.on #three {
  transform: rotate(-45deg) translateX(8px) translateY(-10px);
}

#resize {
  z-index: 2;
  top: 0px;
  position: fixed;
  background: #000;
  width: 100%;
  height: 100%;
  visibility: hidden;
  opacity: 0;
  /* transition: all 1s ease-out; */
  display: table;
}

#resize #menu {
  height: 90px;
  display: table-cell;
  vertical-align: center;
  padding-left: 0;
}

#resize #menu li {
  display: block;
  text-align: center;
  padding: 20px 0;
  font-size: 50px;
  min-height: 50px;
  font-weight: bold;
  transition: all 0.3s ease-out;
}

#resize li:nth-child(1) {
  margin-top:110px;
}

#resize #menu li a {
  color: #fff;
  font-size: 35px;
  text-decoration: none;  
  cursor: pointer;
  transition: all 0.4s ease-out;
}

#resize #menu li a:hover {
  text-decoration: none;
  color: rgb(233, 29, 29);
}



#resize.active {
  visibility: visible;
  opacity: 0.97;
}


@media(max-width: 900px) {
  #toggle {
        visibility: visible;
        opacity: 1;
        margin-top: 15px;
  }

  #toggle .span.scrolled {
    background: #be1b22;
  }

  nav #brand {
        margin-left: 18px;
  }

  #menu a {
    font-family: 'Fjalla One', sans-serif;
        font-weight: 200;
        font-size: 20px;
        letter-spacing: 1px;
  }

  nav #menu {
        display: none;
  }

  nav {
    margin-bottom: -71px;
  }
}

html

<nav>
                <span id="brand">
                      <a href="home.html"><img class="logo" src="../logo site/imgs/logo-transparent.png" alt="image"></a>
                </span>


                <ul id="menu">
                      <li><a href="home.html">Home</a></li>
                      <li><a href="Development.html">Development</a></li>
                      <li><a href="fees.html">Fees</a></li>
                      <li><a href="contact.html">Contact</a></li>

                </ul>

                <div id="toggle">
                      <div class="span" id="one"></div>
                      <div class="span" id="two"></div>
                      <div class="span" id="three"></div>
                </div>
          </nav>

我不知道它为什么闪烁，但我知道它必须对我的 if 语句做些什么!!!

Answer 1

只是更改了这些 $nav.toggleClass('scrolled');到这个 $nav.addClass('scrolled');傻我.....