怎么新建MySQL数据库

注：本demo在小程序环境中测试，其他h5，pc网页通用，只需将小程序单位和标签名改成通用的即可，并按照自己的需求做适配即可。

大体思路：四个相同的正方形田字形布局，配合旋转属性即可。

html结构

<view class="button-group">
  <view class="outter-circle">
    <view class="inner-parts brown" bindtap="button" data-type="volAdd">
      <text class="rotate">+</text>
    </view>
    <view class="inner-parts silver" bindtap="button" data-type="chaAdd">
      <text class="rotate">+</text>
    </view>
    <view class="inner-parts blue" bindtap="button" data-type="chaDes">
      <text class="rotate">-</text>
    </view>
    <view class="inner-parts gold" bindtap="button" data-type="volDes">
      <text class="rotate">-</text>
    </view>

    <view class="inner-circle" bindtap="button" data-type="ok">
      <text class="ok rotate">ok</text>
    </view>
  </view>
</view>

css样式

.button-group {
  padding-top: 20rpx;
  width: 300rpx;
  height: 300rpx;
  background-color: pink;
}
.outter-circle {
  position: relative;
  margin-left: 10rpx;
  width: 280rpx;
  height: 280rpx;
  background-color: lightcyan;
  border-radius: 100%;
  overflow: hidden;
  transform-origin: center;
  transform: rotate(45deg);
}
.inner-parts {
  float: left;
  width: 140rpx;
  height: 140rpx;
  line-height: 140rpx;
  text-align: center;
}
.silver {
  background-color: silver;
}
.gold {
  background-color: gold;
}
.blue {
  background-color: blue;
}
.brown {
  background-color: brown;
}
.inner-circle {
  position: absolute;
  margin-top: 70rpx;
  margin-left: 70rpx;
  width: 140rpx;
  height: 140rpx;
  line-height: 140rpx;
  text-align: center;
  border-radius: 100%;
  background-color: lightblue;
}
.rotate {
  display: inline-block;
  transform: rotate(-45deg);
}

注：文字区域若不inline-block，旋转属性将不生效！

按钮点击事件

button: function(e) {
    var buttonType = e.currentTarget.dataset.type
    console.log(buttonType)
    switch (buttonType) {
      case 'chaAdd':
        console.log('backward the channel')
      break
      case 'chaDes':
        console.log('forward the channel')
      break
      case 'volAdd':
        console.log('strengthen the volumn')
      break
      case 'volDes':
        console.log('weaken the volumn')
      break
      default:
        console.log('ok')
    }
  }

运行效果
 

总结