用css和jquery在圆圈中填充颜色的关键帧

Question

当我们向下滚动页面时，我想按顺时针方向填充圆圈中的颜色。我找到了一种方法来填充链接上的颜色https://codepen.io/HugoGiraudel/pen/BHEwo

<div class="wrapper">
  <div class="pie spinner"></div>
  <div class="pie filler"></div>
  <div class="mask"></div>
</div>

.wrapper {
  position: relative;
  margin: 40px auto;
  background: white;
}

@mixin timer($item, $duration, $size, $color, $border, $hover: running) {

  #{$item} { 
    width: $size;
    height: $size;
  }

  #{$item} .pie {
    width: 50%;
    height: 100%;
    transform-origin: 100% 50%;
    position: absolute;
    background: $color;
  }

  #{$item} .spinner {
    border-radius: 100% 0 0 100% / 50% 0 0 50%;
    z-index: 200;
    border-right: none;
    animation: rota $duration + s linear infinite;
  }

  #{$item}:hover .spinner,
  #{$item}:hover .filler, 
  #{$item}:hover .mask {
    animation-play-state: $hover;    
  }

  #{$item} .filler {
    border-radius: 0 100% 100% 0 / 0 50% 50% 0; 
    left: 50%;
    opacity: 0;
    z-index: 100;
    animation: opa $duration + s steps(1,end) infinite reverse;
    border-left: none;
  }

  #{$item} .mask {
    width: 50%;
    height: 100%;
    position: absolute;
    background: inherit;
    opacity: 1;
    z-index: 300;
    animation: opa $duration + s steps(1,end) infinite;
  }

  @keyframes rota {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
  }

  @keyframes opa {
    0% { opacity: 1; }
    50%, 100% { opacity: 0; }
  }
}

@include timer('.wrapper', 5, 250px, #08C, '5px solid rgba(0,0,0,0.5)');

如果 $(document).scrollTop() 在 100 之间，它从 9 点开始填充，因为 $(document).scrollTop() 越来越大，然后顺时针填充，直到达到 1000。

有什么方法可以实现吗？

Answer 1

如果你在下载 Sass 时遇到问题，下面是没有罗盘组件的代码，只是纯 css。

这将在您的 apache 服务器中运行。

var timer=document.getElementsByClassName('timer')[0];
var timer_1=document.getElementsByClassName('timer_1')[0];
timer_1.style.transform="rotate(360deg)";
timer_1.style.background="#ddd";

window.addEventListener('scroll',function(){

     var scrolled=window.scrollY;
     var diff=scrolled-180;
   
    if(scrolled>=0 && scrolled<=180 ){
        
        timer_1.style.background="#ddd";
        timer_1.style.transform="rotate("+(360-scrolled)+"deg)";
        if(scrolled==180){
        timer_1.style.transform="rotate(180deg)";   
        }
    }
    else{
    if(scrolled>=180.0001){
timer_1.style.background="#6c6";
timer_1.style.transform="rotate("+(360-diff)+"deg)";
if(scrolled>=360){
timer_1.style.transform="rotate(180deg)";   
    }
}
    }

  
})

body{
            min-height: 3000px;
        }
        .timer {  margin-top:100px;background: linear-gradient(90deg, #6c6 50%, #ddd 50%); border-radius: 50%; height: 6em; position: fixed; width: 6em; }
         .timer_1 {  border-radius: 100% 0 0 100% / 50% 0 0 50%; content: ''; height: 100%; left: 0; position: absolute; top: 0; transform-origin: 100% 50%; width: 50%;}
         p{
            font-size: 20px;
            font-family:'arial';
            margin-left: 500px;
            width: 60%;
         }

<div class="timer">
    <div class="timer_1"></div>
</div>
<p>Lorem Ipsum is simply dummy text of the printing and typesetting industry. Lorem Ipsum has been the industry's standard dummy text ever since the 1500s, when an unknown printer took a galley of type and scrambled it to make a type specimen book. It has survived not only five centuries, but also the leap into electronic typesetting, remaining essentially unchanged. It was popularised in the 1960s with the release of Letraset sheets containing Lorem Ipsum passages, and more recently with desktop publishing software like Aldus PageMaker including versions of Lorem Ipsum.</p>
</p>
<p>Lorem Ipsum is simply dummy text of the printing and typesetting industry. Lorem Ipsum has been the industry's standard dummy text ever since the 1500s, when an unknown printer took a galley of type and scrambled it to make a type specimen book. It has survived not only five centuries, but also the leap into electronic typesetting, remaining essentially unchanged. It was popularised in the 1960s with the release of Letraset sheets containing Lorem Ipsum passages, and more recently with desktop publishing software like Aldus PageMaker including versions of Lorem Ipsum.</p>
</p>
<p>Lorem Ipsum is simply dummy text of the printing and typesetting industry. Lorem Ipsum has been the industry's standard dummy text ever since the 1500s, when an unknown printer took a galley of type and scrambled it to make a type specimen book. It has survived not only five centuries, but also the leap into electronic typesetting, remaining essentially unchanged. It was popularised in the 1960s with the release of Letraset sheets containing Lorem Ipsum passages, and more recently with desktop publishing software like Aldus PageMaker including versions of Lorem Ipsum.</p>
</p>
<p>Lorem Ipsum is simply dummy text of the printing and typesetting industry. Lorem Ipsum has been the industry's standard dummy text ever since the 1500s, when an unknown printer took a galley of type and scrambled it to make a type specimen book. It has survived not only five centuries, but also the leap into electronic typesetting, remaining essentially unchanged. It was popularised in the 1960s with the release of Letraset sheets containing Lorem Ipsum passages, and more recently with desktop publishing software like Aldus PageMaker including versions of Lorem Ipsum.</p>
</p>
<p>Lorem Ipsum is simply dummy text of the printing and typesetting industry. Lorem Ipsum has been the industry's standard dummy text ever since the 1500s, when an unknown printer took a galley of type and scrambled it to make a type specimen book. It has survived not only five centuries, but also the leap into electronic typesetting, remaining essentially unchanged. It was popularised in the 1960s with the release of Letraset sheets containing Lorem Ipsum passages, and more recently with desktop publishing software like Aldus PageMaker including versions of Lorem Ipsum.</p>
</p>
<p>Lorem Ipsum is simply dummy text of the printing and typesetting industry. Lorem Ipsum has been the industry's standard dummy text ever since the 1500s, when an unknown printer took a galley of type and scrambled it to make a type specimen book. It has survived not only five centuries, but also the leap into electronic typesetting, remaining essentially unchanged. It was popularised in the 1960s with the release of Letraset sheets containing Lorem Ipsum passages, and more recently with desktop publishing software like Aldus PageMaker including versions of Lorem Ipsum.</p>
</p>
<p>Lorem Ipsum is simply dummy text of the printing and typesetting industry. Lorem Ipsum has been the industry's standard dummy text ever since the 1500s, when an unknown printer took a galley of type and scrambled it to make a type specimen book. It has survived not only five centuries, but also the leap into electronic typesetting, remaining essentially unchanged. It was popularised in the 1960s with the release of Letraset sheets containing Lorem Ipsum passages, and more recently with desktop publishing software like Aldus PageMaker including versions of Lorem Ipsum.</p>
</p>
<p>Lorem Ipsum is simply dummy text of the printing and typesetting industry. Lorem Ipsum has been the industry's standard dummy text ever since the 1500s, when an unknown printer took a galley of type and scrambled it to make a type specimen book. It has survived not only five centuries, but also the leap into electronic typesetting, remaining essentially unchanged. It was popularised in the 1960s with the release of Letraset sheets containing Lorem Ipsum passages, and more recently with desktop publishing software like Aldus PageMaker including versions of Lorem Ipsum.</p>
</p>

Answer 2

添加这段 JS 代码并用下面给出的更改 css，你会得到你需要的。

JS

var wrapper=document.getElementsByClassName('wrapper')[0];
var spinner=document.getElementsByClassName('spinner')[0];
var filler=document.getElementsByClassName('filler')[0];
var mask=document.getElementsByClassName('mask')[0];
var count=0;
window.addEventListener('scroll',function(){
        
     var scrolled=window.scrollY;
     spinner.style.transform="rotate(" + scrolled+ "deg)";
    if(count%2==0)
    {
    if(scrolled>=180){
      filler.style.opacity=1;
    mask.style.opacity=0;  
    count++;  
    }
    }
  else{
    if(scrolled<=180){
      filler.style.opacity=0;
    mask.style.opacity=1;  
    count++;  
    }
  }
  
  
  if(scrolled>=360)
  {
    if(scrolled==360)
    {
    mask.style.opacity=0;
    }
    spinner.style.transform="rotate(360deg)";
  }
    
})

CSS

@import "compass/css3";
body{
  min-height:2400px;
}
.wrapper {
  position: fixed;
  margin: 40px auto;
  background: white;
}

@mixin timer($item, $duration, $size, $color, $border, $hover: running) {
  #{$item}, #{$item} * { @include box-sizing(border-box); }

  #{$item} { 
    width: $size;
    height: $size;
  }

  #{$item} .pie {
    width: 50%;
    height: 100%;
    transform-origin: 100% 50%;
    position: absolute;
    background: $color;
    border: #{$border};
  }

  #{$item} .spinner {
    border-radius: 100% 0 0 100% / 50% 0 0 50%;
    z-index: 200;
    border-right: none;
  }

  #{$item}:hover .spinner,
  #{$item}:hover .filler, 
  #{$item}:hover .mask {
    animation-play-state: $hover;    
  }

  #{$item} .filler {
    border-radius: 0 100% 100% 0 / 0 50% 50% 0; 
    left: 50%;
    opacity: 0;
    z-index: 100;
    border-left: none;
  }

  #{$item} .mask {
    width: 50%;
    height: 100%;
    position: absolute;
    background: inherit;
    opacity: 1;
    z-index: 300;
  }

  @keyframes rota {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
  }

  @keyframes opa {
    0% { opacity: 1; }
    50%, 100% { opacity: 0; }
  }
}

@include timer('.wrapper', 5, 250px, #08C, '5px solid rgba(0,0,0,0.5)');

这会起作用