如何增加预加载器的淡出时间？

Question

我想增加淡出效果的 duration/time。这是预加载器的代码（请参阅下面的更多详细信息）：

 // Preloader
 $(window).on('DOMContentLoaded', function() {
    if ($('#preloader').length) {
      $('#preloader').delay(2000).fadeOut('slow');
    }
});

* {
    padding: 0;
    margin: 0;
    box-sizing: border-box;
}

@import url('https://fonts.googleapis.com/css2?family=Montserrat+Alternates:wght@500;700&family=Montserrat:wght@400;600&family=Oswald:wght@500&family=Pacifico&family=Roboto:ital,wght@0,400;0,900;1,500&display=swap');



.svg-file path {
    fill: transparent;
    stroke-width: 3;
    stroke: rgb(1, 36, 133);
}

.svg-file.z-logo path {
    stroke-dasharray: 550;
    stroke-dashoffset: 0;
}

.svg-file.z-logo path {
    animation: animate-zlogo 2s linear infinite;
}

.svg-file.z-logo svg {
    filter: drop-shadow(2px 2px 3px rgba(0, 0, 0, 1));
    transform: scale(2);
}

.svg-file h2 {
    font-family: "Roboto", cursive;
    transform: translate(0, 50px) skewX(-210deg) rotate(-6deg);
    font-size: 3em;
    color: #044d77;
}

.svg-file span {
    animation: dots 2.5s steps(6, end) infinite;
    font-size: 5em;
    display: block;
    transform: translate(0, 65px) skewX(-210deg) rotate(-6deg);
    background-color: rgb(5, 46, 80);
    width: 8px;
    height: 5px;
}

@keyframes fadein-fadeout {
    0% {
        opacity: 0;
    }

    50% {
        opacity: 1;
    }

    100% {
        opacity: 0;
    }
}

@keyframes animate-zlogo {
    0% {
        stroke-dashoffset: -50;
    }

    20% {
        stroke-dashoffset: 550;
        fill: transparent;
    }

    40% {
        fill: transparent;
        stroke-dashoffset: 1100;
    }

    60% {
        stroke-dashoffset: 1100;
        fill: #05f7f9;    
        }

    80% {
        stroke-width: 0;
       fill: #05f7f9;
    }

    100% {
        /* stroke-dashoffset: 0; */
        stroke-width: 3;
        fill: transparent;
    }
}
#preloader {
  position: fixed;
  z-index: 9999;
  overflow: hidden;
  background: white;
  display: flex;
  justify-content: center;
  align-items: center;
  align-content: center;
  top: 0px;
  left: 0px;
  bottom: 0px;
  right: 0px;
}

.z-logo svg {
  top: 0px;
  left: 0px;
  bottom: 0px;
  right: 0px;
  margin: auto;
  justify-content: center;
  align-items: center;
  align-content: center;
  position: relative;
  display: flex;
  width: 50%;
}

.z-logo::before {
  content: "";
    top: 0px;
  left: 0px;
  bottom: 0px;
  right: 0px;
  margin: auto;
  background: black;
  position: absolute;
  display: inline-flex;
  border: 1px solid black;
  width: 200px;
  height: 200px;
}

 <script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<div id="preloader">
  <div class="svg-file z-logo">
    <svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 133 133" width="133" height="133">
      <g id="H">
        <path d="M45.33 78.22L87.67 78.22L87.67 133L121.05 133L121.05 0L87.67 0L87.67 49.33L45.33 49.33L45.33 0L11.95 0L11.95 133L45.33 133L45.33 78.22Z" fill="#47AF9A" />
      </g>
    </svg>
  </div>
</div>

这里好像淡出很顺利，我这边没有，请问有什么办法可以增加淡出时间吗？

这里还有这一行：我的 js 中的 $('#preloader').delay(2000).fadeOut('slow'); 也控制淡出动画，但有什么办法可以增加淡出时间，使其更平滑比它已经是？现在看起来似乎没有错误，因为我只包含了我的预加载器代码，但我的网站有很多 CSS 文件，所以它使处理成为一个那边有点慢有什么建议吗？

Answer 1

我不可能在没有看到它的情况下猜出是什么影响了你的真实代码中的动画，但是，为了增加持续时间，你可以简单地以毫秒而不是 slow 为单位传递你需要的时间，例如:

 // Preloader
 $(window).on('DOMContentLoaded', function() {
    if ($('#preloader').length) {
      $('#preloader').delay(2000).fadeOut(6000);
    }
});

* {
    padding: 0;
    margin: 0;
    box-sizing: border-box;
}

@import url('https://fonts.googleapis.com/css2?family=Montserrat+Alternates:wght@500;700&family=Montserrat:wght@400;600&family=Oswald:wght@500&family=Pacifico&family=Roboto:ital,wght@0,400;0,900;1,500&display=swap');



.svg-file path {
    fill: transparent;
    stroke-width: 3;
    stroke: rgb(1, 36, 133);
}

.svg-file.z-logo path {
    stroke-dasharray: 550;
    stroke-dashoffset: 0;
}

.svg-file.z-logo path {
    animation: animate-zlogo 2s linear infinite;
}

.svg-file.z-logo svg {
    filter: drop-shadow(2px 2px 3px rgba(0, 0, 0, 1));
    transform: scale(2);
}

.svg-file h2 {
    font-family: "Roboto", cursive;
    transform: translate(0, 50px) skewX(-210deg) rotate(-6deg);
    font-size: 3em;
    color: #044d77;
}

.svg-file span {
    animation: dots 2.5s steps(6, end) infinite;
    font-size: 5em;
    display: block;
    transform: translate(0, 65px) skewX(-210deg) rotate(-6deg);
    background-color: rgb(5, 46, 80);
    width: 8px;
    height: 5px;
}

@keyframes fadein-fadeout {
    0% {
        opacity: 0;
    }

    50% {
        opacity: 1;
    }

    100% {
        opacity: 0;
    }
}

@keyframes animate-zlogo {
    0% {
        stroke-dashoffset: -50;
    }

    20% {
        stroke-dashoffset: 550;
        fill: transparent;
    }

    40% {
        fill: transparent;
        stroke-dashoffset: 1100;
    }

    60% {
        stroke-dashoffset: 1100;
        fill: #05f7f9;    
        }

    80% {
        stroke-width: 0;
       fill: #05f7f9;
    }

    100% {
        /* stroke-dashoffset: 0; */
        stroke-width: 3;
        fill: transparent;
    }
}
#preloader {
  position: fixed;
  z-index: 9999;
  overflow: hidden;
  background: white;
  display: flex;
  justify-content: center;
  align-items: center;
  align-content: center;
  top: 0px;
  left: 0px;
  bottom: 0px;
  right: 0px;
}

.z-logo svg {
  top: 0px;
  left: 0px;
  bottom: 0px;
  right: 0px;
  margin: auto;
  justify-content: center;
  align-items: center;
  align-content: center;
  position: relative;
  display: flex;
  width: 50%;
}

.z-logo::before {
  content: "";
    top: 0px;
  left: 0px;
  bottom: 0px;
  right: 0px;
  margin: auto;
  background: black;
  position: absolute;
  display: inline-flex;
  border: 1px solid black;
  width: 200px;
  height: 200px;
}

 <script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<div id="preloader">
  <div class="svg-file z-logo">
    <svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 133 133" width="133" height="133">
      <g id="H">
        <path d="M45.33 78.22L87.67 78.22L87.67 133L121.05 133L121.05 0L87.67 0L87.67 49.33L45.33 49.33L45.33 0L11.95 0L11.95 133L45.33 133L45.33 78.22Z" fill="#47AF9A" />
      </g>
    </svg>
  </div>
</div>

如何增加预加载器的淡出时间？

How to increase the fade out time of a Preloader?

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animation

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