在页面没有响应时，展示加载动画是一种对用户友好的表现，不至于白屏，等响应内容渲染到页面时再移除动画
先放loading效果图
原理：伪类+动画，下面是步骤图，贴上助于理解，加载动画本质是设置一个定宽定高的正方形，border-radius: 50%;使其成为圆形，再给该div3px的边框并设为透明，然后在单独设置上边框为白色，用::before，::after伪类absolute定位并进行同样设置，不同之处是依次增大留出的间隙，以及动画执行时间变长和设置延迟，这样就能形成圆圈不同快慢的旋转
完整代码：
components文件夹下loading.vue
<template>
<div id="loader_wrapper">
<div id="loader"></div>
<div class="load_title">正在加载，请稍等......</div>
</div>
</template>
<script>
export default{
name:"loading",
}
</script>
<style scoped>
#loader_wrapper{
position: fixed;
top: 0;
left: 0;
width: 100%;
height: 100%;
z-index: 99;
background: rgba(0, 0, 0,.8);
background-size: 100% 100%;
}
#loader{
display: block;
position: relative;
left: 50%;
top: 50%;
width: 300px;
height: 300px;
/* background: red; */
margin: -150px 0 0 -150px;
border-radius: 50%;
border: 3px solid transparent;
border-top-color: #fff;
-webkit-animation: spin 5s linear infinite;
-ms-animation: spin 5s linear infinite;
-moz-animation: spin 5s linear infinite;
-o-animation : spin 5s linear infinite;
animation:spin 5s linear infinite;
z-index: 1001;
}
#loader:before{
content:"";
position: absolute;
top: 5px;
left: 5px;
right: 5px;
bottom: 5px;
border-radius: 50%;
/* background: green; */
border: 3px solid transparent;
border-top-color: #fff;
-webkit-animation: spin 8s linear infinite;
-ms-animation: spin 8s linear infinite;
-moz-animation: spin 8s linear infinite;
-o-animation : spin 8s linear infinite;
animation:spin 8s linear infinite;
}
#loader:after{
content:"";
position: absolute;
top: 15px;
left: 15px;
right: 15px;
bottom: 15px;
border-radius: 50%;
/* background: yellow; */
border: 3px solid transparent;
border-top-color: #fff;
-webkit-animation: spin 8s linear 1s infinite;
-ms-animation: spin 8s linear 1s infinite;
-moz-animation: spin 8s linear 1s infinite;
-o-animation : spin 8s linear 1s infinite;
animation:spin 8s linear 1s infinite;
}
@-webkit-keyframes spin {
0%{
-webkit-transform: rotate(0deg);
-ms-transform: rotate(0deg);
transform:rotate(0deg);
}
100%{
-webkit-transform: rotate(360deg);
-ms-transform: rotate(360deg);
transform: rotate(360deg);
}
}
@keyframes spin{
0%{
-webkit-transform: rotate(0deg);
-ms-transform: rotate(0deg);
transform:rotate(0deg);
}
100%{
-webkit-transform: rotate(360deg);
-ms-transform: rotate(360deg);
transform: rotate(360deg);
}
}
#loader_wrapper .load_title{
font-family: "Open Sans";
color:#fff;
font-size: .3rem;
width: 100%;
text-align: center;
z-index: 9999;
position: absolute;
top: 70%;
opacity: 1;
line-height: .3rem;
}
</style>
在cs.vue页面中引入并注册loading
cs.vue
<template>
<div class="main">
<loading v-if="!initFlag"></loading>
111
</div>
</template>
<script>
import loading from "../components/loading"
export default {
name:"tranin",
data () {
return{
initFlag:false,//初始化全局数据的请求 false表示请求失败
}
},
components:{
loading,
}
}
</script>
