堆叠圆圈在边界半径上产生黑条

Question

我在这里有一个令人费解的事业.

我正在构建一个用作"火炬/探照灯"的鼠标.如果发生悬停,所有文本(内联元素,按钮,你得到的点)都会从通常的白色反转为黑色,正常的背景是黄色的氛围.

我目前有以下设置:

const _$shadow = $('.b-cursor__shadow');
const _$front = $('.b-cursor__front');
const _$back = $('.b-cursor__back');

$(document).on('mousemove', (e) => {
  _$back.css({
    left: e.pageX,
    top: e.pageY
  });
  _$front.css({
    left: e.pageX,
    top: e.pageY
  });
  _$shadow.css({
    left: e.pageX,
    top: e.pageY
  });
});

html,
body {
  padding: 0;
  margin: 0;
  cursor: none;
  background: red;
}

.test {
  background: darkblue;
}

p {
  color: white;
  font-family: sans-serif;
  font-size: 20px;
  max-width: 30rem;
  padding: 1rem;
  margin: 1rem;
  border: 1px solid white;
}

p,
span,
a {
  position: relative;
  z-index: 105;
}

.b-cursor__back,
.b-cursor__front,
.b-cursor__shadow {
  position: fixed;
  width: 8rem;
  height: 8rem;
  margin-left: -4rem;
  margin-top: -4rem;
  border-radius: 50%;
}

.b-cursor__shadow {
  box-shadow: 0px 0px 10px 10px rgba(231, 232, 192, 1);
}

/* background changes */
.b-cursor__back {
  z-index: 104;
  background: #18173e;
  clip-path: circle(50% at 50% 50%);
}

.b-cursor__front {
  z-index: 106;
  background: white;
  clip-path: circle(50% at 50% 50%);
  mix-blend-mode: difference;
}

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>

<p>Lorem ipsum dolor sit amet, consectetur adipiscing elit. Duis pretium pharetra ipsum, at placerat ante maximus vitae. Duis lacus urna, posuere id dapibus in, semper vitae massa. Quisque at egestas nisl. In ex elit, imperdiet eu interdum a, auctor vitae ante. Pellentesque efficitur imperdiet elementum. Integer at nibh gravida nisl sodales ornare ut quis est. Suspendisse sem odio, congue vitae felis at, tincidunt interdum purus. Morbi vitae efficitur est, non congue ante. Proin vel odio et metus sodales lobortis quis ut justo. Phasellus rhoncus eu urna vitae tristique. Suspendisse potenti. Curabitur quis quam lobortis mi laoreet lacinia. Cras non ultrices eros. Nam sed leo et tortor vestibulum cursus nec eu massa. Suspendisse potenti.</p>

<section class="b-cursor">
  <div class="b-cursor__shadow"></div>
  <div class="b-cursor__back"></div>
  <div class="b-cursor__front"></div>
</section>
<div class="test">
  <p>ja uh misschien werkt dit wel niet
    <p>
</div>

(codepen)

这几乎产生了期望的结果,除了border-radius: 50%没有正确处理半好的堆叠div.像素戏剧!图片澄清:

问题:如何在保留当前文本效果的同时删除通过堆叠这两个相同大小的元素而创建的黑色边框？

Answer 1

我只需使用伪元素添加上面的另一个元素来隐藏那个小边框,并通过移动容器而不是每个元素来简化代码.也没必要了clip-path

const _$cursor = $('.b-cursor');

$(document).on('mousemove', (e) => {
  _$cursor.css({
    left: e.pageX,
    top: e.pageY
  });
});

html,
body {
  padding: 0;
  margin: 0;
  cursor: none;
  background: red;
}

.test {
  background: darkblue;
}

p {
  color: white;
  font-family: sans-serif;
  font-size: 20px;
  max-width: 30rem;
  padding: 1rem;
  margin: 1rem;
  border: 1px solid white;
}

p,
span,
a {
  position: relative;
  z-index: 105;
}

.b-cursor { /*no z-index here !!!*/
  position: absolute;
  width: 8rem;
  height: 8rem;
  margin-left: -4rem;
  margin-top: -4rem;
}
/*the magic element*/
.b-cursor:before {
  content:"";
  position:absolute;
  top:-1px;
  left:-1px;
  right:-1px;
  bottom:-1px;
  border:2px solid rgba(231, 232, 192, 1);
  border-radius:50%;
  z-index:999;
}
/**/

.b-cursor__back,
.b-cursor__front,
.b-cursor__shadow {
  position:absolute;
  top:0;
  left:0;
  width:100%;
  height:100%;
  border-radius: 50%;
}

.b-cursor__shadow {
  box-shadow: 0px 0px 10px 10px rgba(231, 232, 192, 1);
}

/* background changes */
.b-cursor__back {
  z-index: 104;
  background: #18173e;
}

.b-cursor__front {
  z-index: 106;
  background: white;
  mix-blend-mode: difference;
}

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>

<p>Lorem ipsum dolor sit amet, consectetur adipiscing elit. Duis pretium pharetra ipsum, at placerat ante maximus vitae. Duis lacus urna, posuere id dapibus in, semper vitae massa. Quisque at egestas nisl. In ex elit, imperdiet eu interdum a, auctor vitae ante. Pellentesque efficitur imperdiet elementum. Integer at nibh gravida nisl sodales ornare ut quis est. Suspendisse sem odio, congue vitae felis at, tincidunt interdum purus. Morbi vitae efficitur est, non congue ante. Proin vel odio et metus sodales lobortis quis ut justo. Phasellus rhoncus eu urna vitae tristique. Suspendisse potenti. Curabitur quis quam lobortis mi laoreet lacinia. Cras non ultrices eros. Nam sed leo et tortor vestibulum cursus nec eu massa. Suspendisse potenti.</p>

<section class="b-cursor">
  <div class="b-cursor__back"></div>
  <div class="b-cursor__front"></div>
  <div class="b-cursor__shadow"></div>
</section>
<div class="test">
  <p>ja uh misschien werkt dit wel niet</p>
</div>

这里有更少的代码和没有jQuery的纯JS的另一个想法:

document.onmousemove = function(e) {
  document.body.style.setProperty('--mx',(e.pageX)+'px');
  document.body.style.setProperty('--my',(e.pageY)+'px');
  
  document.body.style.setProperty('--x',(e.clientX)+'px');
  document.body.style.setProperty('--y',(e.clientY)+'px');
  

}

html {
  background:red;
}
body{
  padding: 1px;
  margin: 0;
  min-height:100vh;
  cursor: none;
  background:
    radial-gradient(circle at var(--x) var(--y),#18173e 4rem,transparent 4rem) fixed;
}

.test {
  background:
    radial-gradient(circle at var(--x) var(--y),#18173e 4rem,transparent 4rem) fixed,
    darkblue;
}

p {
  color: white;
  font-family: sans-serif;
  font-size: 20px;
  max-width: 30rem;
  padding: 1rem;
  margin: 1rem;
  border: 1px solid white;
}

.b-cursor { /*no z-index here !!!*/
  position: absolute;
  width: 8rem;
  height: 8rem;
  top:var(--my);
  left:var(--mx);
  margin-left: -4rem;
  margin-top: -4rem;
}
/*the magic element*/
.b-cursor:before{
  content:"";
  position:absolute;
  top:-1px;
  left:-1px;
  right:-1px;
  bottom:-1px;
  border:2px solid rgba(231, 232, 192, 1);
  border-radius:50%;
  z-index:999;
}
.b-cursor:after {
  content:"";
  position:absolute;
  top:0;
  left:0;
  right:0;
  bottom:0;
  box-shadow: 0px 0px 10px 10px rgba(231, 232, 192, 1);
  border-radius:50%;
  z-index:998;
}
/**/
.b-cursor > div {
  position:absolute;
  top:0;
  left:0;
  width:100%;
  height:100%;
  border-radius: 50%;
  z-index: 997;
  background: white;
  mix-blend-mode: difference;
}

<p>Lorem ipsum dolor sit amet, consectetur adipiscing elit. Duis pretium pharetra ipsum, at placerat ante maximus vitae. Duis lacus urna, posuere id dapibus in, semper vitae massa. Quisque at egestas nisl. In ex elit, imperdiet eu interdum a, auctor vitae ante. Pellentesque efficitur imperdiet elementum. Integer at nibh gravida nisl sodales ornare ut quis est. Suspendisse sem odio, congue vitae felis at, tincidunt interdum purus. Morbi vitae efficitur est, non congue ante. Proin vel odio et metus sodales lobortis quis ut justo. Phasellus rhoncus eu urna vitae tristique. Suspendisse potenti. Curabitur quis quam lobortis mi laoreet lacinia. Cras non ultrices eros. Nam sed leo et tortor vestibulum cursus nec eu massa. Suspendisse potenti.</p>

<section class="b-cursor">
  <div></div>
</section>
<div class="test">
  <p>ja uh misschien werkt dit wel niet</p>
</div>

如果我们考虑另一个渐变来替换阴影和我们用来修复黑色阴影的边框,你仍然可以优化更多:

document.onmousemove = function(e) {
  document.body.style.setProperty('--mx',(e.pageX)+'px');
  document.body.style.setProperty('--my',(e.pageY)+'px');
  
  document.body.style.setProperty('--x',(e.clientX)+'px');
  document.body.style.setProperty('--y',(e.clientY)+'px');
  

}

html {
  background:red;
}
body{
  padding: 1px;
  margin: 0;
  min-height:100vh;
  cursor: none;
  background:
    radial-gradient(circle at var(--x) var(--y),#18173e 4rem,transparent 4rem) fixed;
}

.test {
  background:
    radial-gradient(circle at var(--x) var(--y),#18173e 4rem,transparent 4rem) fixed,
    darkblue;
}

p {
  color: white;
  font-family: sans-serif;
  font-size: 20px;
  max-width: 30rem;
  padding: 1rem;
  margin: 1rem;
  border: 1px solid white;
}

.b-cursor { /*no z-index here !!!*/
  position: absolute;
  width: 8rem;
  height: 8rem;
  top:var(--my);
  left:var(--mx);
  margin-left: -4rem;
  margin-top: -4rem;
}

.b-cursor:before{
  content:"";
  position:absolute;
  top:-10px;
  left:-10px;
  right:-10px;
  bottom:-10px;
  background:
    radial-gradient(farthest-side, 
      transparent calc(100% - 18px),rgba(231, 232, 192, 1) calc(100% - 15px),
      rgba(231, 232, 192, 1) calc(100% - 10px),transparent 100%);
  border-radius:50%;
  z-index:999;
}

.b-cursor:after {
  content:"";
  position:absolute;
  top:0;
  left:0;
  width:100%;
  height:100%;
  border-radius: 50%;
  z-index: 998;
  background: white;
  mix-blend-mode: difference;
}

<p>Lorem ipsum dolor sit amet, consectetur adipiscing elit. Duis pretium pharetra ipsum, at placerat ante maximus vitae. Duis lacus urna, posuere id dapibus in, semper vitae massa. Quisque at egestas nisl. In ex elit, imperdiet eu interdum a, auctor vitae ante. Pellentesque efficitur imperdiet elementum. Integer at nibh gravida nisl sodales ornare ut quis est. Suspendisse sem odio, congue vitae felis at, tincidunt interdum purus. Morbi vitae efficitur est, non congue ante. Proin vel odio et metus sodales lobortis quis ut justo. Phasellus rhoncus eu urna vitae tristique. Suspendisse potenti. Curabitur quis quam lobortis mi laoreet lacinia. Cras non ultrices eros. Nam sed leo et tortor vestibulum cursus nec eu massa. Suspendisse potenti.</p>

<section class="b-cursor">
</section>
<div class="test">
  <p>ja uh misschien werkt dit wel niet</p>
</div>

Safari不支持此问题中at详述的渐变语法,因此这是另一种选择:

document.onmousemove = function(e) {
  document.body.style.setProperty('--mx',(e.pageX)+'px');
  document.body.style.setProperty('--my',(e.pageY)+'px');
  
  document.body.style.setProperty('--x',(e.clientX)+'px');
  document.body.style.setProperty('--y',(e.clientY)+'px');
  

}

html {
  background:red;
}
body{
  padding: 1px;
  margin: 0;
  min-height:100vh;
  cursor: none;
  background:
    radial-gradient(farthest-side ,#18173e 100%,transparent 100%)
    calc(var(--x) - 4rem) calc(var(--y) - 4rem)/8rem 8rem  fixed no-repeat;
}

.test {
  background:
    radial-gradient(farthest-side ,#18173e 100%,transparent 100%)
    calc(var(--x) - 4rem) calc(var(--y) - 4rem)/8rem 8rem  fixed no-repeat,
    darkblue;
}

p {
  color: white;
  font-family: sans-serif;
  font-size: 20px;
  max-width: 30rem;
  padding: 1rem;
  margin: 1rem;
  border: 1px solid white;
}

.b-cursor { /*no z-index here !!!*/
  position: absolute;
  width: 8rem;
  height: 8rem;
  top:var(--my);
  left:var(--mx);
  margin-left: -4rem;
  margin-top: -4rem;
}

.b-cursor:before{
  content:"";
  position:absolute;
  top:-10px;
  left:-10px;
  right:-10px;
  bottom:-10px;
  background:
    radial-gradient(farthest-side, 
      transparent calc(100% - 18px),rgba(231, 232, 192, 1) calc(100% - 15px),
      rgba(231, 232, 192, 1) calc(100% - 10px),transparent 100%);
  border-radius:50%;
  z-index:999;
}

.b-cursor:after {
  content:"";
  position:absolute;
  top:0;
  left:0;
  width:100%;
  height:100%;
  border-radius: 50%;
  z-index: 998;
  background: white;
  mix-blend-mode: difference;
}

<p>Lorem ipsum dolor sit amet, consectetur adipiscing elit. Duis pretium pharetra ipsum, at placerat ante maximus vitae. Duis lacus urna, posuere id dapibus in, semper vitae massa. Quisque at egestas nisl. In ex elit, imperdiet eu interdum a, auctor vitae ante. Pellentesque efficitur imperdiet elementum. Integer at nibh gravida nisl sodales ornare ut quis est. Suspendisse sem odio, congue vitae felis at, tincidunt interdum purus. Morbi vitae efficitur est, non congue ante. Proin vel odio et metus sodales lobortis quis ut justo. Phasellus rhoncus eu urna vitae tristique. Suspendisse potenti. Curabitur quis quam lobortis mi laoreet lacinia. Cras non ultrices eros. Nam sed leo et tortor vestibulum cursus nec eu massa. Suspendisse potenti.</p>

<section class="b-cursor">
</section>
<div class="test">
  <p>ja uh misschien werkt dit wel niet</p>
</div>

Answer 2

这可能适合您的需求.

const _$shadow = $('.b-cursor__shadow');
const _$front = $('.b-cursor__front');
const _$back = $('.b-cursor__back');

$(document).on('mousemove', (e) => {
  _$back.css({
    left: e.pageX,
    top: e.pageY
  });
  _$front.css({
    left: e.pageX,
    top: e.pageY
  });
  _$shadow.css({
    left: e.pageX,
    top: e.pageY
  });
});

html, body {
    padding: 0;
    margin: 0;
    cursor: none;
    background: red;
}
.test {
    background: darkblue;
}
p {
    color: white;
    font-family: sans-serif;
    font-size: 20px;
    max-width: 30rem;
    padding: 1rem;
    margin: 1rem;
    border: 1px solid white;
}
p, span, a {
    position: relative;
    z-index: 105;
}
.b-cursor__shadow2, .b-cursor__back, .b-cursor__front, .b-cursor__shadow {
    position: fixed;
    width: 8rem;
    height: 8rem;
    margin-left: -4rem;
    margin-top: -4rem;
    border-radius: 50%;
}
.b-cursor__shadow {
    box-shadow: 0px 0px 10px 20px rgba(231, 232, 192, 1);
    z-index: 107;
    height: 8rem;
    width: 8rem;
}
.b-cursor__shadow2 {
    background: radial-gradient(circle at center, #18173e 100%, #18173e 25%);
    z-index: 109;
    height: 8rem;
    width: 8rem;
    background-color: transparent;
}
/* background changes */
.b-cursor__back {
    z-index: 104;
    height: 8rem;
    width: 8rem;
    background: radial-gradient(circle at center, #18173e 100%, #18173e 25%);
    background-size: 100% 100%;
    background-position: 50% 50%;
}
.b-cursor__back:after {
    width: 7rem;
    height: 7rem;
    content: '';
    border-radius: 50%;
    background: transparent;
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    box-shadow: 0px 0px 0px 1rem #18173e;
    transition: all 0.3s linear;
    mix-blend-mode: normal;
}
.b-cursor__front {
    z-index: 106;
    height: 8rem;
    width: 8rem;
    background: white;
    background: radial-gradient(circle at center, #ffffff 100%, #ffffff 25%);
    background-position: 50% 50%;
    mix-blend-mode: difference;
}
.b-cursor__front:after {
    width: 7rem;
    height: 7rem;
    content: '';
    border-radius: 50%;
    background: transparent;
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    box-shadow: 0px 0px 0px 1rem #ffffff;
    transition: all 0.3s linear;
    mix-blend-mode: normal;
}

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>

<p>Lorem ipsum dolor sit amet, consectetur adipiscing elit. Duis pretium pharetra ipsum, at placerat ante maximus vitae. Duis lacus urna, posuere id dapibus in, semper vitae massa. Quisque at egestas nisl. In ex elit, imperdiet eu interdum a, auctor vitae
  ante. Pellentesque efficitur imperdiet elementum. Integer at nibh gravida nisl sodales ornare ut quis est. Suspendisse sem odio, congue vitae felis at, tincidunt interdum purus. Morbi vitae efficitur est, non congue ante. Proin vel odio et metus sodales
  lobortis quis ut justo. Phasellus rhoncus eu urna vitae tristique. Suspendisse potenti. Curabitur quis quam lobortis mi laoreet lacinia. Cras non ultrices eros. Nam sed leo et tortor vestibulum cursus nec eu massa. Suspendisse potenti.</p>

<section class="b-cursor">
  <div class="b-cursor__shadow"></div>
  <div class="b-cursor__back"></div>
  <div class="b-cursor__front"></div>
  <div class="cursor_now"></div>
</section>
<div class="test">
  <p>ja uh misschien werkt dit wel niet
    <p>
</div>