源代碼下載

https://github.com/comehope/front-end-daily-challenges

代碼解讀

定義dom，容器中包含文本，并且包含4個用于特效，的data-text屬性值為與文本相同：

web

居中顯示：

html,body{

height:100%;

display:flex;

align-items:center;

justify-content:center;

background:black;

}

定義文本樣式：

.rainbow{

color:white;

font-size:300px;

text-transform:uppercase;

font-family:sans-serif;

font-weight:bold;

line-height:1em;

position:relative;

}

用偽元素增加圖層，形成彩虹效果：

.rainbowspan::before,

.rainbowspan::after{

content:attr(data-text);

position:absolute;

top:0;

left:0;

overflow:hidden;

}

.rainbowspan:nth-child(1)::before{

color:orchid;

z-index:1;

height:calc(100%-10%*1);

}

.rainbowspan:nth-child(1)::after{

color:mediumpurple;

z-index:2;

height:calc(100%-10%*2);

}

.rainbowspan:nth-child(2)::before{

color:deepskyblue;

z-index:3;

height:calc(100%-10%*3);

}

.rainbowspan:nth-child(2)::after{

color:cyan;

z-index:4;

height:calc(100%-10%*4);

}

.rainbowspan:nth-child(3)::before{

color:mediumspringgreen;

z-index:5;

height:calc(100%-10%*5);

}

.rainbowspan:nth-child(3)::after{

color:yellow;

z-index:6;

height:calc(100%-10%*6);

}

.rainbowspan:nth-child(4)::before{

color:gold;

z-index:7;

height:calc(100%-10%*7);

}

.rainbowspan:nth-child(4)::after{

color:tomato;

z-index:8;

height:calc(100%-10%*8);

}

增加動畫效果：

.rainbowspan::before,

.rainbowspan::after{

animation:animate0.8sinfinitealternate;

filter:opacity(0);

}

@keyframesanimate{

from{

filter:opacity(0);

}

to{

filter:opacity(1);

}

}

為圖層設置延時，增強動感：

.rainbowspan:nth-child(1)::before{

animation-delay:calc(0.8s-0.1s*1);

}

.rainbowspan:nth-child(1)::after{

animation-delay:calc(0.8s-0.1s*2);

}

.rainbowspan:nth-child(2)::before{

animation-delay:calc(0.8s-0.1s*3);

}

.rainbowspan:nth-child(2)::after{

animation-delay:calc(0.8s-0.1s*4);

}

.rainbowspan:nth-child(3)::before{

animation-delay:calc(0.8s-0.1s*5);

}

.rainbowspan:nth-child(3)::after{

animation-delay:calc(0.8s-0.1s*6);

}

.rainbowspan:nth-child(4)::before{

animation-delay:calc(0.8s-0.1s*7);

}

.rainbowspan:nth-child(4)::after{

animation-delay:calc(0.8s-0.1s*8);

}

最后，把原始文本設置為透明色：

.rainbow{

color:transparent;

}

大功告成！

本文轉載自中文網

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