如何使用CSS或Javascript创建动画彩虹线？

Question

我想要的效果如下所示 - ＆gt;

我想知道在css / js中是否有更简单的方法可以做到这一点？或者是否有任何库来实现它？

如果形状不是直线而是不规则的曲线怎么办？

Answer 1

不完全喜欢它，但试试这个

.rainbow{
  width:200px;
  height:20px;
  background: -webkit-linear-gradient(left, red,orange,yellow,green,blue,indigo,violet);
  background: -moz-linear-gradient(left, red,orange,yellow,green,blue,indigo,violet,red);
  background: -o-linear-gradient(left, red,orange,yellow,green,blue,indigo,violet,red);
  background: -ms-linear-gradient(left, red,orange,yellow,green,blue,indigo,violet,red);
  background: linear-gradient(to right, red,orange,yellow,green,blue,indigo,violet,red);
  background-repeat:repeat-x;
  
  -webkit-animation:go 1s linear infinite;
  -moz-animation:go 1s linear infinite;
  -o-animation:go 1s linear infinite;
  -ms-animation:go 1s linear infinite;
  animation:go 1s linear infinite;
}

@-webkit-keyframes go{
  0%{background-position:0;}
  100%{background-position:200px 0;}

}
@-moz-keyframes go{
  0%{background-position:0;}
  50%{background-position:100px 0;}
  100%{background-position:200px 0;}

}
@-o-keyframes go{
  0%{background-position:0;}
  100%{background-position:200px 0;}

}
@-ms-keyframes go{
  0%{background-position:0;}
  100%{background-position:200px 0;}

}
@keyframes go{
  0%{background-position:0;}
  100%{background-position:200px 0;}

}

<div class="rainbow"></div>

宽度减小

.rainbow{
  width:200px;
  height:5px;
  background: -webkit-linear-gradient(left, red,orange,yellow,green,blue,indigo,violet);
  background: -moz-linear-gradient(left, red,orange,yellow,green,blue,indigo,violet,red);
  background: -o-linear-gradient(left, red,orange,yellow,green,blue,indigo,violet,red);
  background: -ms-linear-gradient(left, red,orange,yellow,green,blue,indigo,violet,red);
  background: linear-gradient(to right, red,orange,yellow,green,blue,indigo,violet,red);
  background-repeat:repeat-x;
  
  -webkit-animation:go 1s linear infinite;
  -moz-animation:go 1s linear infinite;
  -o-animation:go 1s linear infinite;
  -ms-animation:go 1s linear infinite;
  animation:go 1s linear infinite;
}

@-webkit-keyframes go{
  0%{background-position:0;}
  100%{background-position:200px 0;}

}
@-moz-keyframes go{
  0%{background-position:0;}
  50%{background-position:100px 0;}
  100%{background-position:200px 0;}

}
@-o-keyframes go{
  0%{background-position:0;}
  100%{background-position:200px 0;}

}
@-ms-keyframes go{
  0%{background-position:0;}
  100%{background-position:200px 0;}

}
@keyframes go{
  0%{background-position:0;}
  100%{background-position:200px 0;}

}

<div class="rainbow"></div>

Answer 2

您需要创建一个分隔符并使用CSS为其设置动画。

请参阅已经建立的例子：

https://github.com/codepo8/CSS3-Rainbow-Dividers/blob/master/rainbows.css

源代码（在上面的链接上显示）

/*
 * CSS animated rainbow dividers of awesome 
 * by Chris Heilmann @codepo8 and Lea Verou @leaverou 
**/
@-moz-keyframes charlieeee {
  from { background-position:top left; } 
  to {background-position:top right; }
}
@-webkit-keyframes charlieeee { 
  from { background-position:top left; }  
  to { background-position:top right; }  
}
@-o-keyframes charlieeee { 
  from { background-position:top left; }  
  to { background-position:top right; }  
}
@-ms-keyframes charlieeee { 
  from { background-position:top left; }  
  to { background-position:top right; }  
}
@-khtml-keyframes charlieeee { 
  from { background-position:top left; }  
  to { background-position:top right; }  
}
@keyframes charlieeee { 
  from { background-position:top left; }  
  to { background-position:top right; }  
}
.catchadream{
  background-image:-webkit-linear-gradient( left, red, orange, yellow, green,
                                          blue, indigo, violet, indigo, blue,
                                          green, yellow, orange, red );
  background-image:-moz-linear-gradient( left, red, orange, yellow, green,
                                         blue,indigo, violet, indigo, blue,
                                         green, yellow, orange,red );
  background-image:-o-linear-gradient( left, red, orange, yellow, green,
                                         blue,indigo, violet, indigo, blue,
                                         green, yellow, orange,red );
  background-image:-ms-linear-gradient( left, red, orange, yellow, green,
                                         blue,indigo, violet, indigo, blue,
                                         green, yellow, orange,red );
  background-image:-khtml-linear-gradient( left, red, orange, yellow, green,
                                         blue,indigo, violet, indigo, blue,
                                         green, yellow, orange,red );
  background-image:linear-gradient( left, red, orange, yellow, green,
                                         blue,indigo, violet, indigo, blue,
                                         green, yellow, orange,red );
  -moz-animation:charlieeee 2.5s forwards linear infinite;
  -webkit-animation:charlieeee 2.5s forwards linear infinite;
  -o-animation:charlieeee 2.5s forwards linear infinite;
  -khtml-animation:charlieeee 2.5s forwards linear infinite;
  -ms-animation:charlieeee 2.5s forwards linear infinite;
  -lynx-animation:charlieeee 2.5s forwards linear infinite;
  animation:charlieeee 2.5s forwards linear infinite;
  background-size:50% auto;
}
#tongue{position:cheek;}
/* ^ OMG! An ID! That kills performance! */

/*
  .catchadream:after{content:'廌'}

*/
/* ^ uncomment to add unicorn */ 

以及开发者页面：

http://codepo8.github.io/CSS3-Rainbow-Dividers/

我没有创造这些，只是建议你去哪里。