带有关键帧的简单线条动画

Question

我试着制作一个平滑的动画，但动画在中间有一种“剪切错误”。

我怎么才能修复它？

​

div,
div:after {
  width: 0vw;
  height: 3px;
  position: fixed;
  top: 1vw; bottom: 0;
  left: 40vw; right: 40vw;
  margin: auto;
/*  margin-top: -16px;*/

  z-index: 600;
  background-color: rgba(0, 0, 0, 1);
}

div {
  /*background-color: transparent;*/
/*  border-top: 3px solid rgba(0, 0, 0, 0.1);
  border-right: 3px solid rgba(0, 0, 0, 0.1);
  border-bottom: 3px solid rgba(0, 0, 0, 0.1);
  border-left: 3px solid black;
  -webkit-transform: translateZ(0);
          transform: translateZ(0);*/
  -webkit-animation-iteration-count:infinite;
          animation-iteration-count:infinite;
  -webkit-animation-timing-function: ease-in-out;
          animation-timing-function: ease-in-out;
  -webkit-animation-direction: alternate;
          animation-direction: alternate;
  -webkit-animation-duration: 1s;
          animation-duration: 1s;
  -webkit-animation-name: animsition-loading;
          animation-name: animsition-loading;
}

@-webkit-keyframes animsition-loading {
  0% {
    /*width: 0vw;*/
    transform:translate(0vw);
    width :0vw;
      margin-left: 0;
  }

  50% {
    /*width: 0vw;*/
    /*transform:translate(5vw);*/
    width :10vw;
    
  }

  100% {
    /*width: 0vw;*/
    transform:translate(1vw);
    width :0vw;
    margin-right: 0;
  }
}

<div> </div>

​

Answer 1

下面是用更少的代码实现相同功能的另一种方法：

​

.loading {
  height: 3px;
  position: fixed;
  top: 2vw;
  left: 40vw;
  right: 40vw;
  height: 3px;
  background: linear-gradient(#000, #000) left/0% 100% no-repeat;
  animation: anime 2s ease-in-out infinite alternate;
}

@keyframes anime {
  0% {
    background-size: 0% 100%;
    background-position: left;
  }
  50% {
    background-size: 70% 100%;
  }
  100% {
    background-size: 0% 100%;
    background-position: right;
  }
}

<div class="loading"></div>

​

Answer 2

尝试以这种方式设置动画：

@-webkit-keyframes animsition-loading {
  0% {

    width :0;
    left: 0;
  }

  50% {   
    width :10vw;

  }

  100% {    
    width :0;
    right: 0;
  }

这就是你想要的效果吗？

Answer 3

试试这个，你就完成了..。不要使用transform translate，只使用宽度。

​

div,
div:after {
  width: 0vw;
  height: 3px;
  position: fixed;
  top: 1vw; bottom: 0;
  left: 40vw; right: 40vw;
  margin: auto;
/*  margin-top: -16px;*/

  z-index: 600;
  background-color: rgba(0, 0, 0, 1);
}

div {
  /*background-color: transparent;*/
/*  border-top: 3px solid rgba(0, 0, 0, 0.1);
  border-right: 3px solid rgba(0, 0, 0, 0.1);
  border-bottom: 3px solid rgba(0, 0, 0, 0.1);
  border-left: 3px solid black;
  -webkit-transform: translateZ(0);
          transform: translateZ(0);*/
  -webkit-animation-iteration-count:infinite;
          animation-iteration-count:infinite;
  -webkit-animation-timing-function: ease-in-out;
          animation-timing-function: ease-in-out;
  -webkit-animation-direction: alternate;
          animation-direction: alternate;
  -webkit-animation-duration: 1s;
          animation-duration: 1s;
  -webkit-animation-name: animsition-loading;
          animation-name: animsition-loading;
}

@-webkit-keyframes animsition-loading {
  

0% {

    width :0;
    left: 0;
  }

  50% {   
    width :10vw;

  }

  100% {    
    width :0;
    right: 0;
  }
}

<div> </div>

​