本文轉載自【微信公眾號：趣談前端，ID:beautifulFront】經微信公眾號授權轉載，如需轉載與原文作者聯繫
我們傳統的前端更多的是用javascript實現各種複雜動畫，自從有了Css3 transition和animation以來,前端開發在動畫這一塊有了更高的自由度和格局,對動畫的開發也越來越容易。這篇文章就讓我們匯總一下使用Css3實現的各種特效。
這篇文章參考《css揭秘》這本書，並作出了自己的總結，希望能讓大家更有收穫，也強烈推薦大家看看這本書，你值得擁有。我們將學到
Css3outlineradial-gradientlinear-gradientbox-shadow
1.實現內部虛線邊框
知識點：outline
核心代碼
.dash-border{
width: 200px;
height: 100px;
line-height: 100px;
outline: 1px dashed #fff;
outline-offset: -10px;
}
2.邊框內圓角的實現
知識點：box-shadow
核心代碼
.radius-border{
margin-top: 20px;
width: 180px;
height: 80px;
box-shadow: 0 0 0 10px gray;
}
3.實現條紋背景與進度條
知識點：linear-gradient,repeating-linear-gradient
核心代碼
/* 上 */
background: linear-gradient(to right,#fb3 50%,#58a 0);
background-size: 40px 100%;
box-shadow: inset 0 0 3px #555;
/* 中 */
background: linear-gradient(45deg,#fb3 25%,#58a 0,#58a 50%,#fb3 0,#fb3 75%,#58a 0);
background-size: 40px 40px;
/* 下 (可以實現任意角度的漸變，45°時顯示效果最好) */
background: repeating-linear-gradient(60deg,#fb3,#fb3 15px,#58a 0,#58a 30px);
4.複雜的背景圖案
知識點：linear-gradient,repeating-linear-gradient,radial-gradient
由於第二個圖會有複雜的隨機動畫，建議大家可以親自嘗試看看效果，核心代碼
<style>
.bg-grid{
margin-top: 20px;
width: 200px;
height: 200px;
background-image: linear-gradient(rgba(255,255,255,1) 2px,transparent 0),
linear-gradient(to right,rgba(255,255,255,1) 2px,transparent 0),
linear-gradient(rgba(255,255,255,.2) 1px,transparent 0),
linear-gradient(to right,rgba(255,255,255,.2) 1px,transparent 0);
background-position: -50px -50px;
background-size: 100px 100px,100px 100px, 100% 10px, 10px 100%;
}
.animate-grid{
animation: move-grid 6s linear infinite;
}
@keyframes move-grid{
0%{
background-position: -50px -50px;
}
30%{
background-position: -100px -100px;
}
60%{
background-position: -100px -150px;
}
100%{
background-position: -50px -50px;
}
}
</style>
<div></div>
<div></div>
紅綠燈以及紅路燈隨機運動動畫
利用css3多背景和position實現紅綠燈和背景色塊移動
核心代碼
<style>
.bg-dot{
margin-top: 20px;
width: 200px;
height: 50px;
background-image: radial-gradient(circle,#0cf 15px,transparent),
radial-gradient(circle,red 15px,transparent),
radial-gradient(circle,yellow 15px,transparent),
radial-gradient(circle,green 15px,transparent);
background-repeat: no-repeat;
background-position: 0 0, 50px 0, 100px 0, 150px 0, 200px 0;
background-size: 50px 50px;
}
.animate-dot{
animation: move-dot 8s linear infinite;
}
.animate-dot2{
animation: move-dot2 6s linear infinite;
}
@keyframes move-dot{
0%{
background-position: 0 0, 50px 0, 100px 0, 150px 0;
}
30%{
background-position: 50px 0, 0 0, 100px 0, 150px 0;
}
60%{
background-position: 50px 0, 100px 0, 0 0, 150px 0;
}
100%{
background-position: 50px 0, 100px 0, 150px 0, 0 0;
}
}
@keyframes move-dot2{
0%{
background-image: radial-gradient(circle,#0cf 15px,transparent),
radial-gradient(circle,gray 15px,transparent),
radial-gradient(circle,gray 15px,transparent),
radial-gradient(circle,gray 15px,transparent);
}
30%{
background-image: radial-gradient(circle,gray 15px,transparent),
radial-gradient(circle,red 15px,transparent),
radial-gradient(circle,gray 15px,transparent),
radial-gradient(circle,gray 15px,transparent);
}
60%{
background-image: radial-gradient(circle,gray 15px,transparent),
radial-gradient(circle,gray 15px,transparent),
radial-gradient(circle,yellow 15px,transparent),
radial-gradient(circle,gray 15px,transparent);
}
100%{
background-image: radial-gradient(circle,gray 15px,transparent),
radial-gradient(circle,gray 15px,transparent),
radial-gradient(circle,gray 15px,transparent),
radial-gradient(circle,green 15px,transparent);
}
}
</style>
<div></div>
<div></div>
棋盤背景以及棋盤背景隨機動畫
利用背景漸變實現棋盤圖案
核心代碼
<style>
.bg-qi{
margin-top: 20px;
width: 200px;
height: 200px;
background-color: #eee;
background-image: linear-gradient(45deg,rgba(0,0,0,.25) 25%,transparent 0,transparent 75%,rgba(0,0,0,.25) 0),
linear-gradient(45deg,rgba(0,0,0,.25) 25%,transparent 0,transparent 75%,rgba(0,0,0,.25) 0);
background-position: 0 0, 20px 20px;
background-size: 40px 40px;
box-shadow: 2px 2px 4px rgba(0,0,0,.4);
}
</style>
<div></div>
偽隨機背景
利用背景漸變，keyframe動畫，實現複雜的偽隨機動畫
核心代碼
<style>
.bg-line-rand{
margin-top: 20px;
width: 480px;
height: 60px;
background-color: #eee;
background-image: linear-gradient(90deg,#fb3 11px, transparent 0),
linear-gradient(90deg,#ab4 23px, transparent 0),
linear-gradient(90deg,#655 41px, transparent 0);
background-size: 41px 100%, 61px 100%, 83px 100%;
box-shadow: 2px 2px 4px rgba(0,0,0,.4);
}
.bg-dot-rand{
margin-top: 20px;
width: 200px;
height: 200px;
background-color: #eee;
background-image: radial-gradient(circle,#fb3 5px, transparent 0),
radial-gradient(circle,#ab4 13px, transparent 0),
radial-gradient(circle,#655 31px, transparent 0);
background-repeat: no-repeat;
background-size: 101px 203px, 147px 60px, 373px 201px;
box-shadow: 2px 2px 4px rgba(0,0,0,.4);
}
.animate1{
animation: move 4s linear infinite;
}
.animate2{
animation: move2 4s linear infinite;
}
@keyframes move{
0%{
background-position: 0 0, 0 0, 0 0;
}
50%{
background-position: -10px 0, 20px 0, 30px 0;
}
100%{
background-position: 0 0, 30px 0, 10px 0;
}
}
@keyframes move2{
0%{
background-position: 0 0, 0 0, 0 0;
}
50%{
background-position: -10px 30px, 20px 0, -40px 80px;
}
100%{
background-position: 0 20px, 60px -20px, 10px 30px;
}
}
</style>
<div></div>
<div></div>
<div></div>
5.折角效果
知識點：linear-gradient
核心代碼
<style>
.fold{
margin-left: auto;
margin-right: auto;
margin-bottom: 20px;
width: 200px;
height: 80px;
color: #fff;
line-height: 80px;
text-align: center;
background: linear-gradient(to left bottom,transparent 50%,rgba(0,0,0,.5) 0) no-repeat 100% 0 / 2em 2em,
linear-gradient(-135deg,transparent 1.4em,#06c 0);
}
.linear{
background: linear-gradient(to left bottom,transparent 50%,rgba(0,0,0,.5)) no-repeat 100% 0 / 2em 2em,
linear-gradient(-135deg,transparent 1.4em,#06c);
}
</style>
<div>折角效果哦</div>
<div>折角效果哦</div>
2.內陰影圓折角效果
核心代碼
<style>
.fold-1{
margin-left: auto;
margin-right: auto;
margin-bottom: 20px;
position: relative;
width: 200px;
height: 80px;
border-radius: .5em;
color: #fff;
line-height: 80px;
text-align: center;
background: linear-gradient(-150deg,transparent 1.5em, #58a 0);
}
.fold-1::before{
content: "";
position: absolute;
top: 0;
right: 0;
background: linear-gradient(to left bottom,transparent 50%,rgba(0,0,0,.2) 0,rgba(0,0,0,.4)) 100% 0 no-repeat;
width: 1.73em;
height: 3em;
transform: translateY(-1.3em) rotate(-30deg);
transform-origin: bottom right;
border-bottom-left-radius: inherit;
box-shadow: -.2em .2em .3em -.1em rgba(0,0,0,.15);
}
</style>
<div>折角效果哦</div>
6.自適應文本的條紋背景
知識點：linear-gradient,line-height,background-origin
核心代碼
<style>
.stripe-bg{
padding: .5em;
line-height: 1.5em;
background: beige;
background-size: auto 3em;
background-origin: content-box;
background-image: linear-gradient(rgba(0,0,0,.2) 50%, transparent 0);
}
.stripe-bg > p{
margin: 0;
}
</style>
<div>
<p>hello you</p>
<p>hello you</p>
<p>hello you</p>
<p>hello you</p>
<p>hello you</p>
</div>
7.自定義的下劃線實現
知識點linear-gridient
小夥伴們注意到了嗎？默認的下劃線會將文字穿過，而上面的不會呦！
核心代碼
<style>
.my-line{
line-height: 1.4em;
background: linear-gradient(gray,gray) no-repeat;
background-size: 100% 1px;
background-position: 0 1.15em;
text-shadow: .05em 0 #fff, -.05em 0 #fff;
}
</style>
<div><span>i have your big apple.you have a too? hi hi hi.</span></div>