根据背景颜色更改汉堡菜单的颜色

时间：2019-09-02 09:17:47

标签： javascript html css

有一个白色汉堡菜单。问题在于，在我的项目中，该网站的某些位置由于背景不透明而无法看到。任务是编写一个脚本，该脚本应根据背景颜色将颜色更改为对比色。在下面的代码中，例如，在黑色背景上，菜单应变为白色。最初的计划是为每个块分配一个不同的ID，并且当菜单图标打到新部分时，它将更改颜色。但是由于知识不足，js无法正常工作。还链接到codepen：

@import url(https://fonts.googleapis.com/css?family=Quicksand);
html,
body {
   height: 100%;
   background-color: red;
   font-family: 'Quicksand', sans-serif;
   color: white;
}

#menuToggle {
  display: block;
  position: fixed;
  top: 50px;
  left: 50px;
  
  z-index: 1;
  
  -webkit-user-select: none;
  user-select: none;
}

#menuToggle input {
  display: block;
  width: 40px;
  height: 32px;
  position: absolute;
  top: -7px;
  left: -5px;
  
  cursor: pointer;
  
  opacity: 0; /* hide this */
  z-index: 2; /* and place it over the hamburger */
  
  -webkit-touch-callout: none;
}

/*
 * Just a quick hamburger
 */
#menuToggle span {
  display: block;
  width: 33px;
  height: 4px;
  margin-bottom: 5px;
  position: relative;
  
  background: #000;
  border-radius: 3px;
  
  z-index: 1;
  
  transform-origin: 4px 0px;
  
  transition: transform 0.5s cubic-bezier(0.77,0.2,0.05,1.0),
              background 0.5s cubic-bezier(0.77,0.2,0.05,1.0),
              opacity 0.55s ease;
}

#menuToggle span:first-child {
  transform-origin: 0% 0%;
}

#menuToggle span:nth-last-child(2) {
  transform-origin: 0% 100%;
}

/* 
 * Transform all the slices of hamburger
 * into a crossmark.
 */
#menuToggle input:checked ~ span {
  opacity: 1;
  transform: rotate(45deg) translate(-2px, -1px);
  background: #232323;
}

/*
 * But let's hide the middle one.
 */
#menuToggle input:checked ~ span:nth-last-child(3) {
  opacity: 0;
  transform: rotate(0deg) scale(0.2, 0.2);
}

/*
 * Ohyeah and the last one should go the other direction
 */
#menuToggle input:checked ~ span:nth-last-child(2) {
  transform: rotate(-45deg) translate(0, -1px);
}

/*
 * Make this absolute positioned
 * at the top left of the screen
 */
#menu {
  position: absolute;
  width: 300px;
  margin: -100px 0 0 -50px;
  padding: 50px;
  padding-top: 125px;
  
  background: #ededed;
  list-style-type: none;
  -webkit-font-smoothing: antialiased;
  /* to stop flickering of text in safari */
  
  transform-origin: 0% 0%;
  transform: translate(-100%, 0);
  
  transition: transform 0.5s cubic-bezier(0.77,0.2,0.05,1.0);
}

#menu li {
  padding: 10px 0;
  font-size: 22px;
}

/*
 * And let's slide it in from the left
 */
#menuToggle input:checked ~ ul {
  transform: none;
}
<!--    Made by Erik Terwan    -->
<!--   24th of November 2015   -->
<!--        MIT License        -->
<nav role="navigation">
  <div id="menuToggle">
    <!--
    A fake / hidden checkbox is used as click reciever,
    so you can use the :checked selector on it.
    -->
    <input type="checkbox" />
    
    <!--
    Some spans to act as a hamburger.
    
    They are acting like a real hamburger,
    not that McDonalds stuff.
    -->
    <span></span>
    <span></span>
    <span></span>
    
    <!--
    Too bad the menu has to be inside of the button
    but hey, it's pure CSS magic.
    -->
    <ul id="menu">
      <a href="#"><li>Home</li></a>
      <a href="#"><li>About</li></a>
      <a href="#"><li>Info</li></a>
      <a href="#"><li>Contact</li></a>
      <a href="https://erikterwan.com/" target="_blank"><li>Show me more</li></a>
    </ul>
  </div>
</nav>


<div class="container" #slide-1>
   <div class="row">
      <div class="col-sm-10 col-sm-push-1 col-md-8 col-md-push-2">
         <h1>Full Screen Burger Menu</h1>
         <h3>Click the burger.</h3>
         <p>Lucas ipsum dolor sit amet darth lando qui-gonn mara droid jade qui-gonn skywalker wedge lars. Ben antilles chewbacca palpatine mothma fisto binks mara. Wicket greedo c-3p0 han lars mara darth. Darth binks wookiee mara luuke amidala. Lando kessel jango wicket. Moff jango dantooine luuke skywalker obi-wan. Darth mandalore binks leia solo moff yoda. Darth c-3p0 maul ben jar lando. Jabba ahsoka grievous mandalorians kenobi wookiee chewbacca. Binks calrissian tatooine baba jango k-3po darth calamari yavin.</p>
         <p>Wicket sidious organa skywalker mandalore mon qui-gonn fisto. Leia grievous biggs bespin calamari. Alderaan luuke darth hutt. Vader leia boba kashyyyk dagobah jade kashyyyk. Lars amidala gonk lobot organa. Twi'lek darth gamorrean obi-wan boba moff. Yavin c-3p0 darth darth luke chewbacca han. Skywalker dooku c-3po owen. Leia jade alderaan jar dooku utapau tusken raider dantooine jawa. Anakin leia kessel jango bespin lando organa tatooine tusken raider. Mara ackbar mara calamari hutt qui-gonn dantooine.</p>
         <p>Yoda sidious lando padmé chewbacca fett. Maul calrissian boba lobot jade darth obi-wan. Wookiee darth ahsoka dagobah darth sidious naboo lars. Dooku skywalker skywalker ben luke windu. Wicket darth coruscant darth coruscant organa palpatine yoda padmé. Darth leia organa gonk lando mon mara hutt. Wookiee darth padmé windu hutt. Darth cade maul padmé grievous greedo moff dooku solo. Coruscant twi'lek dooku moff skywalker.</p>
      </div>
   </div>
</div>

<div class="container" style="background-color:#000;width:100%;">
   <div class="row">
      <div class="col-sm-10 col-sm-push-1 col-md-8 col-md-push-2">
         <h1>Full Screen Burger Menu</h1>
         <h3>Click the burger.</h3>
         <p>Lucas ipsum dolor sit amet darth lando qui-gonn mara droid jade qui-gonn skywalker wedge lars. Ben antilles chewbacca palpatine mothma fisto binks mara. Wicket greedo c-3p0 han lars mara darth. Darth binks wookiee mara luuke amidala. Lando kessel jango wicket. Moff jango dantooine luuke skywalker obi-wan. Darth mandalore binks leia solo moff yoda. Darth c-3p0 maul ben jar lando. Jabba ahsoka grievous mandalorians kenobi wookiee chewbacca. Binks calrissian tatooine baba jango k-3po darth calamari yavin.</p>
         <p>Wicket sidious organa skywalker mandalore mon qui-gonn fisto. Leia grievous biggs bespin calamari. Alderaan luuke darth hutt. Vader leia boba kashyyyk dagobah jade kashyyyk. Lars amidala gonk lobot organa. Twi'lek darth gamorrean obi-wan boba moff. Yavin c-3p0 darth darth luke chewbacca han. Skywalker dooku c-3po owen. Leia jade alderaan jar dooku utapau tusken raider dantooine jawa. Anakin leia kessel jango bespin lando organa tatooine tusken raider. Mara ackbar mara calamari hutt qui-gonn dantooine.</p>
         <p>Yoda sidious lando padmé chewbacca fett. Maul calrissian boba lobot jade darth obi-wan. Wookiee darth ahsoka dagobah darth sidious naboo lars. Dooku skywalker skywalker ben luke windu. Wicket darth coruscant darth coruscant organa palpatine yoda padmé. Darth leia organa gonk lando mon mara hutt. Wookiee darth padmé windu hutt. Darth cade maul padmé grievous greedo moff dooku solo. Coruscant twi'lek dooku moff skywalker.</p>
      </div>
   </div>
</div>

2 个答案:

答案 0 :(得分：1)

您可能会发现使用mix-blend-mode的基于CSS的解决方案是更健壮和灵活的替代方法，而不是使用JavaScript来解决。

通过mix-blend-mode属性，您可以控制元素在背景下的混合行为。在您的情况下，可以通过"difference" blend mode获得对比的外观，以确保在大多数情况下都可以看到汉堡包。

差异混合模式可以被认为是“颜色反转”-当应用于汉堡菜单时，这将确保菜单在大多数背景下可见。这种方法的另一个好处是，它可以在大多数纯色，图像或渐变背景下使用。

您可以通过添加以下CSS来为菜单使用混合功能：

#menuToggle {
    mix-blend-mode: difference; /* Invert color of menu from background */
}

#menuToggle span {
    background:white; /* Ensure full blend contrast with background */
}

以下也是有效的代码段：

@import url(https://fonts.googleapis.com/css?family=Quicksand);
html,
body {
  height: 100%;
  background-color: red;
  font-family: 'Quicksand', sans-serif;
  color: white;
}

#menuToggle {
  display: block;
  position: fixed;
  top: 50px;
  left: 50px;
  z-index: 1;
  -webkit-user-select: none;
  user-select: none;
  
    mix-blend-mode: difference;
}

#menuToggle input {
  display: block;
  width: 40px;
  height: 32px;
  position: absolute;
  top: -7px;
  left: -5px;
  cursor: pointer;
  opacity: 0;
  /* hide this */
  z-index: 2;
  /* and place it over the hamburger */
  -webkit-touch-callout: none;
}


/*
 * Just a quick hamburger
 */

#menuToggle span {
  display: block;
  width: 33px;
  height: 4px;
  margin-bottom: 5px;
  position: relative; 
  border-radius: 3px;
  z-index: 1;
  transform-origin: 4px 0px;
  transition: transform 0.5s cubic-bezier(0.77, 0.2, 0.05, 1.0), background 0.5s cubic-bezier(0.77, 0.2, 0.05, 1.0), opacity 0.55s ease;
  
  background:white;
}

#menuToggle span:first-child {
  transform-origin: 0% 0%;
}

#menuToggle span:nth-last-child(2) {
  transform-origin: 0% 100%;
}


/* 
 * Transform all the slices of hamburger
 * into a crossmark.
 */

#menuToggle input:checked~span {
  opacity: 1;
  transform: rotate(45deg) translate(-2px, -1px);
  background: #232323;
}


/*
 * But let's hide the middle one.
 */

#menuToggle input:checked~span:nth-last-child(3) {
  opacity: 0;
  transform: rotate(0deg) scale(0.2, 0.2);
}


/*
 * Ohyeah and the last one should go the other direction
 */

#menuToggle input:checked~span:nth-last-child(2) {
  transform: rotate(-45deg) translate(0, -1px);
}


/*
 * Make this absolute positioned
 * at the top left of the screen
 */

#menu {
  position: absolute;
  width: 300px;
  margin: -100px 0 0 -50px;
  padding: 50px;
  padding-top: 125px;
  background: #ededed;
  list-style-type: none;
  -webkit-font-smoothing: antialiased;
  /* to stop flickering of text in safari */
  transform-origin: 0% 0%;
  transform: translate(-100%, 0);
  transition: transform 0.5s cubic-bezier(0.77, 0.2, 0.05, 1.0);
}

#menu li {
  padding: 10px 0;
  font-size: 22px;
}


/*
 * And let's slide it in from the left
 */

#menuToggle input:checked~ul {
  transform: none;
}
<!--    Made by Erik Terwan    -->
<!--   24th of November 2015   -->
<!--        MIT License        -->
<nav role="navigation">
  <div id="menuToggle">
    <!--
    A fake / hidden checkbox is used as click reciever,
    so you can use the :checked selector on it.
    -->
    <input type="checkbox" />

    <!--
    Some spans to act as a hamburger.
    
    They are acting like a real hamburger,
    not that McDonalds stuff.
    -->
    <span></span>
    <span></span>
    <span></span>

    <!--
    Too bad the menu has to be inside of the button
    but hey, it's pure CSS magic.
    -->
    <ul id="menu">
      <a href="#">
        <li>Home</li>
      </a>
      <a href="#">
        <li>About</li>
      </a>
      <a href="#">
        <li>Info</li>
      </a>
      <a href="#">
        <li>Contact</li>
      </a>
      <a href="https://erikterwan.com/" target="_blank">
        <li>Show me more</li>
      </a>
    </ul>
  </div>
</nav>


<div class="container" #slide-1>
  <div class="row">
    <div class="col-sm-10 col-sm-push-1 col-md-8 col-md-push-2">
      <h1>Full Screen Burger Menu</h1>
      <h3>Click the burger.</h3>
      <p>Lucas ipsum dolor sit amet darth lando qui-gonn mara droid jade qui-gonn skywalker wedge lars. Ben antilles chewbacca palpatine mothma fisto binks mara. Wicket greedo c-3p0 han lars mara darth. Darth binks wookiee mara luuke amidala. Lando kessel
        jango wicket. Moff jango dantooine luuke skywalker obi-wan. Darth mandalore binks leia solo moff yoda. Darth c-3p0 maul ben jar lando. Jabba ahsoka grievous mandalorians kenobi wookiee chewbacca. Binks calrissian tatooine baba jango k-3po darth
        calamari yavin.</p>
      <p>
        Wicket sidious organa skywalker mandalore mon qui-gonn fisto. Leia grievous biggs bespin calamari. Alderaan luuke darth hutt. Vader leia boba kashyyyk dagobah jade kashyyyk. Lars amidala gonk lobot organa. Twi'lek darth gamorrean obi-wan boba moff. Yavin
        c-3p0 darth darth luke chewbacca han. Skywalker dooku c-3po owen. Leia jade alderaan jar dooku utapau tusken raider dantooine jawa. Anakin leia kessel jango bespin lando organa tatooine tusken raider. Mara ackbar mara calamari hutt qui-gonn dantooine.
      </p>
      <p>
        Yoda sidious lando padmé chewbacca fett. Maul calrissian boba lobot jade darth obi-wan. Wookiee darth ahsoka dagobah darth sidious naboo lars. Dooku skywalker skywalker ben luke windu. Wicket darth coruscant darth coruscant organa palpatine yoda padmé.
        Darth leia organa gonk lando mon mara hutt. Wookiee darth padmé windu hutt. Darth cade maul padmé grievous greedo moff dooku solo. Coruscant twi'lek dooku moff skywalker.
      </p>
    </div>
  </div>
</div>

<div class="container" style="background-color:#000;width:100%;">
  <div class="row">
    <div class="col-sm-10 col-sm-push-1 col-md-8 col-md-push-2">
      <h1>Full Screen Burger Menu</h1>
      <h3>Click the burger.</h3>
      <p>Lucas ipsum dolor sit amet darth lando qui-gonn mara droid jade qui-gonn skywalker wedge lars. Ben antilles chewbacca palpatine mothma fisto binks mara. Wicket greedo c-3p0 han lars mara darth. Darth binks wookiee mara luuke amidala. Lando kessel
        jango wicket. Moff jango dantooine luuke skywalker obi-wan. Darth mandalore binks leia solo moff yoda. Darth c-3p0 maul ben jar lando. Jabba ahsoka grievous mandalorians kenobi wookiee chewbacca. Binks calrissian tatooine baba jango k-3po darth
        calamari yavin.</p>
      <p>
        Wicket sidious organa skywalker mandalore mon qui-gonn fisto. Leia grievous biggs bespin calamari. Alderaan luuke darth hutt. Vader leia boba kashyyyk dagobah jade kashyyyk. Lars amidala gonk lobot organa. Twi'lek darth gamorrean obi-wan boba moff. Yavin
        c-3p0 darth darth luke chewbacca han. Skywalker dooku c-3po owen. Leia jade alderaan jar dooku utapau tusken raider dantooine jawa. Anakin leia kessel jango bespin lando organa tatooine tusken raider. Mara ackbar mara calamari hutt qui-gonn dantooine.
      </p>
      <p>
        Yoda sidious lando padmé chewbacca fett. Maul calrissian boba lobot jade darth obi-wan. Wookiee darth ahsoka dagobah darth sidious naboo lars. Dooku skywalker skywalker ben luke windu. Wicket darth coruscant darth coruscant organa palpatine yoda padmé.
        Darth leia organa gonk lando mon mara hutt. Wookiee darth padmé windu hutt. Darth cade maul padmé grievous greedo moff dooku solo. Coruscant twi'lek dooku moff skywalker.
      </p>
    </div>
  </div>
</div>

答案 1 :(得分：1)

您也可以尝试遵循，scrolling添加类然后通过CSS控制颜色。

$(window).scroll(function() {
  var height = $('#scroll-to').offset().top - 70;
  var sticky = $('#scroll-to'),
    scroll = $(window).scrollTop();

  if (scroll >= height) sticky.parent('body').addClass('change');
  else sticky.parent('body').removeClass('change');
});
@import url(https://fonts.googleapis.com/css?family=Quicksand);
html,
body {
  height: 100%;
  background-color: red;
  font-family: 'Quicksand', sans-serif;
  color: white;
}

#menuToggle {
  display: block;
  position: fixed;
  top: 50px;
  left: 50px;
  z-index: 1;
  -webkit-user-select: none;
  user-select: none;
}

#menuToggle input {
  display: block;
  width: 40px;
  height: 32px;
  position: absolute;
  top: -7px;
  left: -5px;
  cursor: pointer;
  opacity: 0;
  /* hide this */
  z-index: 2;
  /* and place it over the hamburger */
  -webkit-touch-callout: none;
}


/*
 * Just a quick hamburger
 */

#menuToggle span {
  display: block;
  width: 33px;
  height: 4px;
  margin-bottom: 5px;
  position: relative;
  background: #000;
  border-radius: 3px;
  z-index: 1;
  transform-origin: 4px 0px;
  transition: transform 0.5s cubic-bezier(0.77, 0.2, 0.05, 1.0), background 0.5s cubic-bezier(0.77, 0.2, 0.05, 1.0), opacity 0.55s ease;
}

#menuToggle span:first-child {
  transform-origin: 0% 0%;
}

#menuToggle span:nth-last-child(2) {
  transform-origin: 0% 100%;
}


/* 
 * Transform all the slices of hamburger
 * into a crossmark.
 */

#menuToggle input:checked~span {
  opacity: 1;
  transform: rotate(45deg) translate(-2px, -1px);
  background: #232323;
}


/*
 * But let's hide the middle one.
 */

#menuToggle input:checked~span:nth-last-child(3) {
  opacity: 0;
  transform: rotate(0deg) scale(0.2, 0.2);
}


/*
 * Ohyeah and the last one should go the other direction
 */

#menuToggle input:checked~span:nth-last-child(2) {
  transform: rotate(-45deg) translate(0, -1px);
}


/*
 * Make this absolute positioned
 * at the top left of the screen
 */

#menu {
  position: absolute;
  width: 300px;
  margin: -100px 0 0 -50px;
  padding: 50px;
  padding-top: 125px;
  background: #ededed;
  list-style-type: none;
  -webkit-font-smoothing: antialiased;
  /* to stop flickering of text in safari */
  transform-origin: 0% 0%;
  transform: translate(-100%, 0);
  transition: transform 0.5s cubic-bezier(0.77, 0.2, 0.05, 1.0);
}

#menu li {
  padding: 10px 0;
  font-size: 22px;
}


/*
 * And let's slide it in from the left
 */

#menuToggle input:checked~ul {
  transform: none;
}

.change #menuToggle span {
  background: #fff;
}
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<!--    Made by Erik Terwan    -->
<!--   24th of November 2015   -->
<!--        MIT License        -->
<nav role="navigation">
  <div id="menuToggle">
    <!--
    A fake / hidden checkbox is used as click reciever,
    so you can use the :checked selector on it.
    -->
    <input type="checkbox" />

    <!--
    Some spans to act as a hamburger.
    
    They are acting like a real hamburger,
    not that McDonalds stuff.
    -->
    <span></span>
    <span></span>
    <span></span>

    <!--
    Too bad the menu has to be inside of the button
    but hey, it's pure CSS magic.
    -->
    <ul id="menu">
      <a href="#">
        <li>Home</li>
      </a>
      <a href="#">
        <li>About</li>
      </a>
      <a href="#">
        <li>Info</li>
      </a>
      <a href="#">
        <li>Contact</li>
      </a>
      <a href="https://erikterwan.com/" target="_blank">
        <li>Show me more</li>
      </a>
    </ul>
  </div>
</nav>


<div class="container" #slide-1>
  <div class="row">
    <div class="col-sm-10 col-sm-push-1 col-md-8 col-md-push-2">
      <h1>Full Screen Burger Menu</h1>
      <h3>Click the burger.</h3>
      <p>Lucas ipsum dolor sit amet darth lando qui-gonn mara droid jade qui-gonn skywalker wedge lars. Ben antilles chewbacca palpatine mothma fisto binks mara. Wicket greedo c-3p0 han lars mara darth. Darth binks wookiee mara luuke amidala. Lando kessel
        jango wicket. Moff jango dantooine luuke skywalker obi-wan. Darth mandalore binks leia solo moff yoda. Darth c-3p0 maul ben jar lando. Jabba ahsoka grievous mandalorians kenobi wookiee chewbacca. Binks calrissian tatooine baba jango k-3po darth
        calamari yavin.</p>
      <p>
        Wicket sidious organa skywalker mandalore mon qui-gonn fisto. Leia grievous biggs bespin calamari. Alderaan luuke darth hutt. Vader leia boba kashyyyk dagobah jade kashyyyk. Lars amidala gonk lobot organa. Twi'lek darth gamorrean obi-wan boba moff. Yavin
        c-3p0 darth darth luke chewbacca han. Skywalker dooku c-3po owen. Leia jade alderaan jar dooku utapau tusken raider dantooine jawa. Anakin leia kessel jango bespin lando organa tatooine tusken raider. Mara ackbar mara calamari hutt qui-gonn dantooine.
      </p>
      <p>
        Yoda sidious lando padmé chewbacca fett. Maul calrissian boba lobot jade darth obi-wan. Wookiee darth ahsoka dagobah darth sidious naboo lars. Dooku skywalker skywalker ben luke windu. Wicket darth coruscant darth coruscant organa palpatine yoda padmé.
        Darth leia organa gonk lando mon mara hutt. Wookiee darth padmé windu hutt. Darth cade maul padmé grievous greedo moff dooku solo. Coruscant twi'lek dooku moff skywalker.
      </p>
    </div>
  </div>
</div>

<div class="container" id="scroll-to" style="background-color:#000;width:100%;">
  <div class="row">
    <div class="col-sm-10 col-sm-push-1 col-md-8 col-md-push-2">
      <h1>Full Screen Burger Menu</h1>
      <h3>Click the burger.</h3>
      <p>Lucas ipsum dolor sit amet darth lando qui-gonn mara droid jade qui-gonn skywalker wedge lars. Ben antilles chewbacca palpatine mothma fisto binks mara. Wicket greedo c-3p0 han lars mara darth. Darth binks wookiee mara luuke amidala. Lando kessel
        jango wicket. Moff jango dantooine luuke skywalker obi-wan. Darth mandalore binks leia solo moff yoda. Darth c-3p0 maul ben jar lando. Jabba ahsoka grievous mandalorians kenobi wookiee chewbacca. Binks calrissian tatooine baba jango k-3po darth
        calamari yavin.</p>
      <p>
        Wicket sidious organa skywalker mandalore mon qui-gonn fisto. Leia grievous biggs bespin calamari. Alderaan luuke darth hutt. Vader leia boba kashyyyk dagobah jade kashyyyk. Lars amidala gonk lobot organa. Twi'lek darth gamorrean obi-wan boba moff. Yavin
        c-3p0 darth darth luke chewbacca han. Skywalker dooku c-3po owen. Leia jade alderaan jar dooku utapau tusken raider dantooine jawa. Anakin leia kessel jango bespin lando organa tatooine tusken raider. Mara ackbar mara calamari hutt qui-gonn dantooine.
      </p>
      <p>
        Yoda sidious lando padmé chewbacca fett. Maul calrissian boba lobot jade darth obi-wan. Wookiee darth ahsoka dagobah darth sidious naboo lars. Dooku skywalker skywalker ben luke windu. Wicket darth coruscant darth coruscant organa palpatine yoda padmé.
        Darth leia organa gonk lando mon mara hutt. Wookiee darth padmé windu hutt. Darth cade maul padmé grievous greedo moff dooku solo. Coruscant twi'lek dooku moff skywalker.
      </p>
    </div>
  </div>
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