We often use busy waiting situations, such as ajax waiting for a callback, or when loading a page, our usual approach is to put a loading.gif image and rotate it there.
I used to use it on PC, and I didn’t think it was inappropriate. Now that I want to use it on mobile, the problem arises. In the past, making the front end and compatible with various browsers was enough to give people a headache. Now it also needs to be compatible with various screen sizes.
To start, I made N gif pictures of different sizes. Use javascript to determine the screen size, and then select the appropriate gif image. The shortcomings of this are very obvious, and it would make you cry if you talk about it too much. What I have to do now is to replace
with css3 to achieve this effect. See the rendering below:
If you are interested, you can copy the source code below:
<!DOCTYPE html><html><head> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> <meta charset="utf-8"> <meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1"> <meta name="viewport" content="width=device-width, initial-scale=1, user-scalable=0, maximum-scale=3"> <meta name="apple-mobile-web-app-capable" content="yes"> <meta name="apple-mobile-web-app-status-bar-style" content="black"> <style type="text/css"> body { margin: 0; padding: 0; }/* for busy */#busyIcon { z-index:99999; position:absolute; top:0;left:0; width:100%; height:100%; background-color: rgba(0,0,0,0.7);}.container { width:100px; height: 100px; background-color:black; opacity: 0.8; margin-top: -50px; margin-left: -50px; position: absolute; top:50%;left:50%; -webkit-border-radius: 10%;}.top,.base { height: 30%;}.spinner { height: 40%; width: 40%; position: relative; margin: 0 auto;}.spinner div { width: 12%; height: 26%; background-color: white; position: absolute; left: 44.5%; top: 37%; opacity: 0; -webkit-border-radius: 30%; -webkit-animation: fade 1s linear infinite;}.spinner div.bar1 {-webkit-transform:rotate(0deg) translate(0, -142%); -webkit-animation-delay: 0s;} .spinner div.bar2 {-webkit-transform:rotate(30deg) translate(0, -142%); -webkit-animation-delay: -0.9167s;}.spinner div.bar3 {-webkit-transform:rotate(60deg) translate(0, -142%); -webkit-animation-delay: -0.833s;}.spinner div.bar4 {-webkit-transform:rotate(90deg) translate(0, -142%); -webkit-animation-delay: -0.75s;}.spinner div.bar5 {-webkit-transform:rotate(120deg) translate(0, -142%); -webkit-animation-delay: -0.667s;}.spinner div.bar6 {-webkit-transform:rotate(150deg) translate(0, -142%); -webkit-animation-delay: -0.5833s;}.spinner div.bar7 {-webkit-transform:rotate(180deg) translate(0, -142%); -webkit-animation-delay: -0.5s;}.spinner div.bar8 {-webkit-transform:rotate(210deg) translate(0, -142%); -webkit-animation-delay: -0.41667s;}.spinner div.bar9 {-webkit-transform:rotate(240deg) translate(0, -142%); -webkit-animation-delay: -0.333s;}.spinner div.bar10 {-webkit-transform:rotate(270deg) translate(0, -142%); -webkit-animation-delay: -0.25s;}.spinner div.bar11 {-webkit-transform:rotate(300deg) translate(0, -142%); -webkit-animation-delay: -0.1667s;}.spinner div.bar12 {-webkit-transform:rotate(330deg) translate(0, -142%); -webkit-animation-delay: -0.0833s;}@-webkit-keyframes fade { from {opacity: 1;} to {opacity: 0.25;}}/*End busy*/ </style></head><body><div id="busyIcon"> <div class="container"> <div class="top"></div> <div class="spinner"> <div class="bar1"></div> <div class="bar2"></div> <div class="bar3"></div> <div class="bar4"></div> <div class="bar5"></div> <div class="bar6"></div> <div class="bar7"></div> <div class="bar8"></div> <div class="bar9"></div> <div class="bar10"></div> <div class="bar11"></div> <div class="bar12"></div> </div> <div class="base"></div> </div></div></body></html> This is for convenience of demonstration, for browsing The compatibility of the browser is omitted. In the actual project, I used js to encapsulate it to facilitate calling and control.
This example only records the principle, and the encapsulated code will not be posted. Below is a screenshot of the effect in the application.
There is a lot more that css3 can do, and I will share it slowly in the future.
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css与xml的区别是什么Apr 24, 2022 am 11:21 AM区别是：css是层叠样式表单，是将样式信息与网页内容分离的一种标记语言，主要用来设计网页的样式，还可以对网页各元素进行格式化；xml是可扩展标记语言，是一种数据存储语言，用于使用简单的标记描述数据，将文档分成许多部件并对这些部件加以标识。
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css怎么实现英文小写转为大写Apr 25, 2022 pm 06:35 PM转换方法：1、给英文元素添加“text-transform: uppercase;”样式，可将所有的英文字母都变成大写；2、给英文元素添加“text-transform:capitalize;”样式，可将英文文本中每个单词的首字母变为大写。
rtl在css是什么意思Apr 24, 2022 am 11:07 AM在css中，rtl是“right-to-left”的缩写，是从右往左的意思，指的是内联内容从右往左依次排布，是direction属性的一个属性值；该属性规定了文本的方向和书写方向，语法为“元素{direction:rtl}”。
css怎么设置i不是斜体Apr 20, 2022 am 10:36 AM在css中，可以利用“font-style”属性设置i元素不是斜体样式，该属性用于指定文本的字体样式，当属性值设置为“normal”时，会显示元素的标准字体样式，语法为“i元素{font-style:normal}”。
怎么设置rotate在css3的旋转中心点Apr 24, 2022 am 10:50 AM在css3中，可以用“transform-origin”属性设置rotate的旋转中心点，该属性可更改转换元素的位置，第一个参数设置x轴的旋转位置，第二个参数设置y轴旋转位置，语法为“transform-origin:x轴位置 y轴位置”。
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