液体选项卡栏动画

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html

css

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html

css

.tabbar {
  --primary: #275EFE;
  --background: #fff;
  --inactive: #99A3BA;
  --shadow: rgba(18, 22, 33, .24);
  --line: #CDD9ED;
  background: var(--background);
  box-shadow: 0 1px 4px -1px var(--shadow);
  border-radius: 5px 5px 21px 21px;
  width: 360px;
  -webkit-tap-highlight-color: transparent;
  overflow: hidden;
}
.tabbar ul {
  --x: 54px;
  margin: 0;
  padding: 0 12px;
  list-style: none;
  display: grid;
  position: relative;
  overflow: hidden;
  text-align: center;
  grid-template-columns: repeat(4, minmax(0, 1fr));
}
.tabbar ul:before {
  content: '';
  position: absolute;
  top: 0;
  left: var(--x);
  background: var(--primary);
  width: 60px;
  margin-left: -30px;
  height: 40px;
}
.tabbar ul li {
  position: relative;
}
.tabbar ul li:before, .tabbar ul li:after {
  content: '';
  background: var(--background);
  height: 44px;
  width: 84px;
  position: absolute;
  top: 0;
  left: 50%;
  margin-left: -42px;
}
.tabbar ul li:before {
  border-radius: 0 48% 0 0;
}
.tabbar ul li:after {
  border-radius: 48% 0 0 0;
}
.tabbar ul li a {
  padding: 20px 0;
  display: block;
  text-decoration: none;
  position: relative;
  z-index: 1;
  color: var(--primary);
  transition: -webkit-transform .2s ease;
  transition: transform .2s ease;
  transition: transform .2s ease, -webkit-transform .2s ease;
}
.tabbar ul li a:active {
  -webkit-transform: scale(0.9);
          transform: scale(0.9);
}
.tabbar ul li a:before, .tabbar ul li a:after {
  content: '';
  top: 0;
  left: 50%;
  position: absolute;
  background: var(--primary);
  border-radius: 1px;
  width: 2px;
  margin-left: -1px;
  -webkit-transform-origin: 50% 0;
          transform-origin: 50% 0;
  -webkit-transform: translateY(-14px) scaleX(0.6);
          transform: translateY(-14px) scaleX(0.6);
}
.tabbar ul li a:before {
  height: 8px;
}
.tabbar ul li a:after {
  height: 4px;
}
.tabbar ul li a div {
  background: var(--inactive);
  width: 24px;
  height: 24px;
  margin: 0 auto 4px auto;
}
.tabbar ul li a div:before {
  --y: -100%;
  content: '';
  display: block;
  width: 100%;
  height: 100%;
  top: 0;
  left: 0;
  -webkit-transform: translateY(var(--y));
          transform: translateY(var(--y));
  position: absolute;
  transition: -webkit-transform .4s linear;
  transition: transform .4s linear;
  transition: transform .4s linear, -webkit-transform .4s linear;
  background: var(--primary);
}
.tabbar ul li a span {
  display: block;
  font-weight: 500;
  font-size: 14px;
  opacity: 0;
  transition: opacity .36s linear;
}
.tabbar ul li.active:before {
  -webkit-animation: before 1.1s ease;
          animation: before 1.1s ease;
}
.tabbar ul li.active:after {
  -webkit-animation: after 1.1s ease;
          animation: after 1.1s ease;
}
.tabbar ul li.active a {
  -webkit-animation: bounce .9s linear .3s;
          animation: bounce .9s linear .3s;
}
.tabbar ul li.active a:before {
  -webkit-animation: drop .4s linear .1s forwards;
          animation: drop .4s linear .1s forwards;
}
.tabbar ul li.active a:after {
  -webkit-animation: drop .5s linear .13s forwards;
          animation: drop .5s linear .13s forwards;
}
.tabbar ul li.active a div:before {
  --y: 0;
  transition-delay: .3s;
}
.tabbar ul li.active a span {
  opacity: 1;
  transition-delay: .38s;
}
.tabbar ul li.calendar a div {
  -webkit-mask-box-image: url("http://www.jq22.com/jswj/calendar.svg");
  -webkit-mask: url("http://www.jq22.com/jswj/calendar.svg");
          mask: url("http://www.jq22.com/jswj/calendar.svg");
}
.tabbar ul li.files a div {
  -webkit-mask-box-image: url("http://www.jq22.com/jswj/file.svg");
  -webkit-mask: url("http://www.jq22.com/jswj/file.svg");
          mask: url("http://www.jq22.com/jswj/file.svg");
}
.tabbar ul li.notification a div {
  -webkit-mask-box-image: url("http://www.jq22.com/jswj/bell.svg");
  -webkit-mask: url("http://www.jq22.com/jswj/bell.svg");
          mask: url("http://www.jq22.com/jswj/bell.svg");
}
.tabbar ul li.settings a div {
  -webkit-mask-box-image: url("http://www.jq22.com/jswj/settings.svg");
  -webkit-mask: url("http://www.jq22.com/jswj/settings.svg");
          mask: url("http://www.jq22.com/jswj/settings.svg");
}

@-webkit-keyframes bounce {
  40% {
    -webkit-transform: translateY(9px);
            transform: translateY(9px);
  }
  55% {
    -webkit-transform: translateY(-1px);
            transform: translateY(-1px);
  }
  70% {
    -webkit-transform: translateY(4px);
            transform: translateY(4px);
  }
}

@keyframes bounce {
  40% {
    -webkit-transform: translateY(9px);
            transform: translateY(9px);
  }
  55% {
    -webkit-transform: translateY(-1px);
            transform: translateY(-1px);
  }
  70% {
    -webkit-transform: translateY(4px);
            transform: translateY(4px);
  }
}
@-webkit-keyframes drop {
  50% {
    -webkit-transform: translateY(10px) scaleY(1.2) scaleX(0.5);
            transform: translateY(10px) scaleY(1.2) scaleX(0.5);
  }
  100% {
    -webkit-transform: translateY(20px) scaleY(0) scaleX(0.5);
            transform: translateY(20px) scaleY(0) scaleX(0.5);
  }
}
@keyframes drop {
  50% {
    -webkit-transform: translateY(10px) scaleY(1.2) scaleX(0.5);
            transform: translateY(10px) scaleY(1.2) scaleX(0.5);
  }
  100% {
    -webkit-transform: translateY(20px) scaleY(0) scaleX(0.5);
            transform: translateY(20px) scaleY(0) scaleX(0.5);
  }
}
@-webkit-keyframes before {
  45%,
    55% {
    -webkit-transform: translateX(-41px);
            transform: translateX(-41px);
  }
}
@keyframes before {
  45%,
    55% {
    -webkit-transform: translateX(-41px);
            transform: translateX(-41px);
  }
}
@-webkit-keyframes after {
  45%,
    55% {
    -webkit-transform: translateX(41px);
            transform: translateX(41px);
  }
}
@keyframes after {
  45%,
    55% {
    -webkit-transform: translateX(41px);
            transform: translateX(41px);
  }
}
html {
  box-sizing: border-box;
  -webkit-font-smoothing: antialiased;
}

* {
  box-sizing: inherit;
}
*:before, *:after {
  box-sizing: inherit;
}

body {
  font-family: 'Roboto', Arial;
  min-height: 100vh;
  display: flex;
  justify-content: center;
  align-items: center;
  background: #EEF4FF;
}

JavaScript

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