滚动时更改按钮颜色的剪辑

Question

我正在尝试这样做：CSS change color on scroll / cut text - overflow z-index 当有人滚动时，它使用剪辑来改变按钮的颜色。我希望它在从页眉移动到正文时发生变化，但它对我不起作用。

body { 
 background:#F7FE2E;
 margin: 0;
}

#header{ 
 padding:200px 50px;
 background-color: #6495ED;
}

/*HERE IS THE HEADER AND BODY CLIP*/
#header, 
#content {
 clip: rect(auto, auto, auto, auto);
 box-sizing: border-box;
}

/********** MENU ***********/

.menu{
 top: 15px;
 right: 40px;
 font-size: 16px;
 position:fixed;
}

.black {
   color: #000000;
}

.white {
   color: #FFFFFF;
}

 <div id="wrapper">

    <div id="header">

   <!--HERE IS THE FIXED MENU WHITE-->
      <div class="menu white">MENU</div>

  </div>

  <div id="content"> 

      <!--HERE IS THE FIXED MENU BLACK-->
      <div class="menu black">MENU</div>

      CONTENT<br>CONTENT<br>CONTENT<br>CONTENT<br>CONTENT<br>CONTENT<br>CONTENT<br>CONTENT<br>CONTENT<br>CONTENT<br>CONTENT<br>CONTENT<br>CONTENT<br>CONTENT<br>CONTENT<br>CONTENT<br>CONTENT<br>CONTENT<br>CONTENT<br>CONTENT<br>CONTENT<br>CONTENT<br>CONTENT<br>CONTENT<br>CONTENT<br>CONTENT<br>CONTENT<br>CONTENT<br>CONTENT<br>CONTENT<br>CONTENT<br>CONTENT<br>CONTENT<br>CONTENT<br>CONTENT<br>CONTENT<br>CONTENT<br>CONTENT<br>CONTENT<br>CONTENT<br>CONTENT<br>CONTENT<br>CONTENT<br>CONTENT<br>CONTENT<br>CONTENT<br>CONTENT<br>CONTENT<br>CONTENT<br>CONTENT<br>CONTENT<br>CONTENT<br>CONTENT<br>CONTENT<br>CONTENT<br>CONTENT<br>CONTENT<br>CONTENT<br>CONTENT<br>CONTENT<br>CONTENT<br>CONTENT<br>CONTENT<br>CONTENT<br>CONTENT<br>CONTENT<br>CONTENT<br>CONTENT<br>CONTENT<br>CONTENT<br>

     </div>

 </div>

为什么不起作用？

Answer 1

您应该使用 jquery 来更改滚动时菜单的颜色，如下所示：

$(window).scroll(function() {
  if ($(this).scrollTop() > 380) {
    $(".menu").removeClass("white").addClass("black");
  } else {
    $(".menu").removeClass("black").addClass("white");
  }
});

body {
  background: #F7FE2E;
  margin: 0;
}
#header {
  padding: 200px 50px;
  background-color: #6495ED;
}
/*HERE IS THE HEADER AND BODY CLIP*/

#header,
#content {
  clip: rect(auto, auto, auto, auto);
  box-sizing: border-box;
}
/********** MENU ***********/

.menu {
  top: 15px;
  right: 40px;
  font-size: 16px;
  position: fixed;
}
.black {
  color: #000000;
}
.white {
  color: #FFFFFF;
}

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>

<div id="wrapper">

    <div id="header">

   <!--HERE IS THE FIXED MENU WHITE-->
      <div class="menu white">MENU</div>

  </div>

  <div id="content"> 

      CONTENT<br>CONTENT<br>CONTENT<br>CONTENT<br>CONTENT<br>CONTENT<br>CONTENT<br>CONTENT<br>CONTENT<br>CONTENT<br>CONTENT<br>CONTENT<br>CONTENT<br>CONTENT<br>CONTENT<br>CONTENT<br>CONTENT<br>CONTENT<br>CONTENT<br>CONTENT<br>CONTENT<br>CONTENT<br>CONTENT<br>CONTENT<br>CONTENT<br>CONTENT<br>CONTENT<br>CONTENT<br>CONTENT<br>CONTENT<br>CONTENT<br>CONTENT<br>CONTENT<br>CONTENT<br>CONTENT<br>CONTENT<br>CONTENT<br>CONTENT<br>CONTENT<br>CONTENT<br>CONTENT<br>CONTENT<br>CONTENT<br>CONTENT<br>CONTENT<br>CONTENT<br>CONTENT<br>CONTENT<br>CONTENT<br>CONTENT<br>CONTENT<br>CONTENT<br>CONTENT<br>CONTENT<br>CONTENT<br>CONTENT<br>CONTENT<br>CONTENT<br>CONTENT<br>CONTENT<br>CONTENT<br>CONTENT<br>CONTENT<br>CONTENT<br>CONTENT<br>CONTENT<br>CONTENT<br>CONTENT<br>CONTENT<br>CONTENT<br>

     </div>

 </div>

Answer 2

这是您需要的答案，您只是错过了一些规则。查看下面的代码片段以获取评论...

body {
  background: some-arbitrary-color; /* clipping doesn't use THIS color => */
  margin: 0;
}
#header {
  top: 0; /* [OPTIONAL] add */
  padding: 200px 50px;
  background-color: #6495ED;
}


/* [MANDATORY] add */
#content {
  top: 400px;                /* (2 x 200px) px, vw, %, whatever works best*/
  background-color: #F7FE2E; /* => but NEEDS this bg-color to mix */
}
/*******************/


/*HERE IS THE HEADER AND BODY CLIP*/
#header,
#content {
  position: absolute; /* [MANDATORY] add, clipping needs absolute positioning */
  width: 100%;        /* [MANDATORY] add, and position needs width */
  clip: rect(auto, auto, auto, auto);
  box-sizing: border-box;
}
/********** MENU ***********/
.menu {
  top: 15px;
  right: 40px;
  font-size: 16px;
  position: fixed;
}
.black {
  color: #000000;
}
.white {
  color: #FFFFFF;
}

<div id="header">

  <!--HERE IS THE FIXED MENU WHITE-->
  <div class="menu white">MENU</div>

</div>

<div id="content">

  <!--HERE IS THE FIXED MENU BLACK-->
  <div class="menu black">MENU</div>

  CONTENT
  <br>CONTENT
  <br>CONTENT
  <br>CONTENT
  <br>CONTENT
  <br>CONTENT
  <br>CONTENT
  <br>CONTENT
  <br>CONTENT
  <br>CONTENT
  <br>CONTENT
  <br>CONTENT
  <br>CONTENT
  <br>CONTENT
  <br>CONTENT
  <br>CONTENT
  <br>CONTENT
  <br>CONTENT
  <br>CONTENT
  <br>CONTENT
  <br>CONTENT
  <br>CONTENT
  <br>CONTENT
  <br>CONTENT
  <br>CONTENT
  <br>CONTENT
  <br>CONTENT
  <br>CONTENT
  <br>CONTENT
  <br>CONTENT
  <br>CONTENT
  <br>CONTENT
  <br>CONTENT
  <br>CONTENT
  <br>CONTENT
  <br>CONTENT
  <br>CONTENT
  <br>CONTENT
  <br>CONTENT
  <br>CONTENT
  <br>CONTENT
  <br>CONTENT
  <br>CONTENT
  <br>CONTENT
  <br>CONTENT
  <br>CONTENT
  <br>CONTENT
  <br>CONTENT
  <br>CONTENT
  <br>CONTENT
  <br>CONTENT
  <br>CONTENT
  <br>CONTENT
  <br>CONTENT
  <br>CONTENT
  <br>CONTENT
  <br>CONTENT
  <br>CONTENT
  <br>CONTENT
  <br>CONTENT
  <br>CONTENT
  <br>CONTENT
  <br>CONTENT
  <br>CONTENT
  <br>CONTENT
  <br>CONTENT
  <br>CONTENT
  <br>CONTENT
  <br>CONTENT
  <br>CONTENT
  <br>

</div>

</div>

滚动时更改按钮颜色的剪辑

Clip for change button color when scroll

html

css

scroll

clip