微信小程序-实现Loading预加载动态效果

 需求：实现点击登入按钮有一个预加载效果，如下图

实例参考一：

实例参考二：

 

 实例一：

 <view class="body">
    <view class="onLoad" wx:if="{{flag2}}">
      <view class="loading">
        <view class="login" style="color: #5F5F5F">登录中</view>
        <view class="dot" animation="{{alpha[0]}}"></view>
        <view class="dot" animation="{{alpha[1]}}"></view>
        <view class="dot" animation="{{alpha[2]}}"></view>
      </view>
    </view>
  </view>

Page({
    data: {
    alpha: [ 1, 1, 1],
},
  onLoad: function(options) {
    //加载动画
    var self = this;
    var _index = 0;
    var _alpha = self.data.alpha;
    var _speed = 500;
    var timer = setInterval(function () {
      var an_show = wx.createAnimation({});
      var an_hide = wx.createAnimation({});
      an_show.opacity(1).step({ duration: _speed });
      an_hide.opacity(0).step({ duration: _speed });
      _alpha[_index] = an_show;
      _alpha[_index == 0 ? 2 : _index - 1] = an_hide;
      self.setData({
        alpha: _alpha
      })
      _index = _index == 2 ? 0 : _index + 1;
    }, _speed);
  },

})

实例二：

<view class="tui-loading-row">
  <view class="tui-loading-cell">
    <view class="circle-line">
      <text></text>
      <text></text>
      <text></text>
      <text></text>
      <text></text>
      <text></text>
      <text></text>
      <text></text>
    </view>
  </view>
</view>

//js不需要

/*css*/
.tui-loading-row{
    width: 100%;
    display: table;
    table-layout: fixed;
}
.tui-loading-cell{
  width: 100%;
  display: table-cell;
  text-align: center;
}
.circle-line{
    width: 100px;
    height: 100px;
    display: inline-block;
    position: relative;
}
.circle-line text{
    display: block;
    width: 50%;
    height: 5px;
    opacity: .7;
    position: absolute;
    top: calc(50% - 2.5px);
    left: 0px;
    transform-origin: center right; 
    animation: circle 1.5s linear infinite; 
}
.circle-line text::before{
    content: '';
    display: block;
    width: 15px;
    height: 5px;
    position: absolute;
    top: 0;
    right: 10px;
    background-color: red;
}
.circle-line text:nth-child(1){
    transform: rotate(0deg);
    animation-delay: 0.2s;
}
.circle-line text:nth-child(2){
    transform: rotate(45deg);
    animation-delay: 0.4s;
}
.circle-line text:nth-child(3){
    transform: rotate(90deg);
    animation-delay: 0.6s;
}
.circle-line text:nth-child(4){
    transform: rotate(135deg);
    animation-delay: 0.8s;
}
.circle-line text:nth-child(5){
    transform: rotate(180deg);
    animation-delay: 1s;
}
.circle-line text:nth-child(6){
    transform: rotate(225deg);
    animation-delay: 1.2s;
}
.circle-line text:nth-child(7){
    transform: rotate(270deg);
    animation-delay: 1.4s;
}
.circle-line text:nth-child(8){
    transform: rotate(315deg);
    animation-delay: 1.6s;
}
@keyframes circle {
    0%{
        opacity: 0.05;
    }
    100%{
        opacity: 0.9;
    }
}

参考：

https://blog.csdn.net/findhappy117/article/details/83104690?depth_1-utm_source=distribute.pc_relevant.none-task&utm_source=distribute.pc_relevant.none-task

https://blog.csdn.net/ruixue0117/article/details/83508362

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