圆弧和扇形的加载动画该怎么写？

0.静态效果图

1.画弧度的代码

width: 3em;
height: 3em;
border: 7px transparent solid;
border-left: 7px #4DB6AC solid;
border-radius: 50%;

* 这里还有另一个方式

border-left:7px #4DB6AC solid;	
border-radius: 50%;
border-top:7px transparent solid;
border-bottom:7px transparent solid;

　　后者做成旋转动画效果不如前者,肉眼能感到差异,在chrome49.

2.画扇形的代码

border: 7px transparent solid;
border-left: 7px #4DB6AC solid;
border-radius: 50%;

* 画扇形不可以定义宽度和长度,其余与画圆弧相同

3.less 封装画圆弧和扇形的代码

.arc(@direction,@style){
@color:~`"@{style}".split(/,\s+/)[1]`;
@width:~`"@{style}".split(/,\s+/)[0].replace("[","")`;
@shape:~`"@{style}".split(/,\s+/)[2].replace("]","")`;
border: @width transparent @shape;
@length:length(@direction);
.setStyle(@length,@style,@direction);
border-radius: 50%;

.setStyle(@length,@style,@direction) when (@length>0){
@index:@length - 1;
@pos:extract(@direction,@length);
border-@{pos}:@style ;
.setStyle(@index,@style,@direction);

}
}
//使用方式:
@driection 可以是top、left、right、bottom中的一个或多个
@style 需要严格按照 7px solid red 这样的顺序
.arc(left,7px solid red);
.arc(left top,7px solid red);

View Code

4.加载动画的完整代码

<!DOCTYPE html><html lang="en"><head><meta charset="UTF-8"><title>Document</title><style> html,body {  overflow: hidden;  width: 100%;  height: 100%;}.container {  display: -webkit-box;  display: -ms-flexbox;  display: flex;  -ms-flex-wrap: wrap;  flex-wrap: wrap;  -webkit-box-pack: space-around;  -ms-flex-pack: space-around;  justify-content: space-around;  margin: 0 auto;  max-width: 650px;  min-width: 200px;}.container .canvas {  -webkit-box-align: center;  -ms-flex-align: center;  align-items: center;  display: -webkit-box;  display: -ms-flexbox;  display: flex;  -webkit-box-pack: center;  -ms-flex-pack: center;  justify-content: center;  background: #eee;  border-radius: 50%;  -webkit-box-shadow: 0 5px 20px rgba(0, 0, 0, 0.2);  box-shadow: 0 5px 20px rgba(0, 0, 0, 0.2);  height: 10em;  width: 10em;  margin: 1em 1em 2em 1em;}.container .canvas .spinner4 {  width: 3em;  height: 3em;  border: 7px transparent solid;  border-left: 7px #4DB6AC solid;  border-radius: 50%;  -webkit-animation: spinner4 1s linear infinite;  animation: spinner4 1s linear infinite;}@-webkit-keyframes spinner4 {  100% {
            -webkit-transform: rotate(360deg);-ms-transform: rotate(360deg);-o-transform: rotate(360deg);transform: rotate(360deg);  }}
        @keyframes spinner4 {  100% {
            -webkit-transform: rotate(360deg);-ms-transform: rotate(360deg);-o-transform: rotate(360deg);transform: rotate(360deg);  }}
        .container .canvas .spinner5 {  border: 1.5em transparent solid;  border-right: 1.5em #4DB6AC solid;  border-left: 1.5em #4DB6AC solid;  border-radius: 50%;  -webkit-animation: spinner5 1s linear infinite;  animation: spinner5 1s linear infinite;}@-webkit-keyframes spinner5 {  0% {
            transform: rotate(0deg);  }  50% {transform: rotate(60deg);  }  100% {transform: rotate(360deg);  }}
        @keyframes spinner5 {  0% {
            transform: rotate(0deg);  }  50% {transform: rotate(60deg);  }  100% {transform: rotate(360deg);  }}
        .container .canvas .spinner6 {  width: 1em;  height: 1em;  border-radius: 50%;  background-color: #4db6ac;  margin: 0.1em;  -webkit-animation: fall 1s linear infinite;  animation: fall 1s linear infinite;}
        </style></head><body><div class="container"><div class="canvas"><div class="spinner4"></div></div><div class="canvas"><div class="spinner5"></div></div></div></body></html>

View Code

5.声明

案例代码是我从网上看到的，我自己模仿了一下但无论效果和方法上都不如前者。

欣慰的是能够知道原理，只是细节之处还需练习。

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