堆叠圆会在边界半径上产生黑条

时间：2019-02-13 16:08:25

标签： html css css3

我这里的企业相当令人困惑。

我正在构建一个用作“火炬/探照灯”的鼠标。如果发生悬停，则所有文本（内联元素，按钮，您明白了）会从通常的白色反转为黑色，正常背景是淡黄色的氛围。

我目前具有以下设置：

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）

这几乎产生了预期的结果，除了border-radius: 50%不能正确处理准精巧的div堆叠。像素剧！图片说明：

Screenshot

问题：如何在保留当前对文本的影响的同时删除通过堆叠两个相同大小的元素而创建的黑色边框？

3 个答案:

答案 0 :(得分：10)

我将在上面使用伪元素简单地添加另一个元素，以隐藏该小边框，并通过移动容器而不是每个元素来简化代码。也不需要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>

这是另一种想法，更少的代码和不带jQuery的纯JS：

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>

如果我们考虑使用另一种渐变来替代用于修复黑色阴影和边框的渐变，您仍然可以进行更多优化：

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this question中详细介绍的at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>

答案 1 :(得分：5)

这可能满足您的需求。

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>

答案 2 :(得分：0)

尝试添加

filter:blur(1.4px); /* or anywhere between 0.7px to 1.9px */

到外圈或内圈。在您的CSS

中
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