0.静态效果图
1.画弧度的代码
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]`;
@~`"@{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);
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>
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。