z-index.uvue

<template>
  <view style="flex-grow: 1;">
    <view style="position:absolute;z-index:0;">
      <view class="common fixed default">
        <text>position: fixed</text>
        <text>z-index: 10</text>
      </view>
      <view class="common fixed specified">
        <text>position: fixed</text>
        <text>z-index: 5</text>
      </view>
      <view class="common fixed floor">
        <text>position: fixed</text>
        <text>z-index: -1</text>
      </view>
    </view>
    <view style="top: 250px;">
      <view class="common" style="background-color: red;z-index: 10;">
        <text>z-index: 10</text>
      </view>
      <view ref="view" class="common" style="background-color: green;z-index: 5;top: -37px;left: 87px;"
        @click="changeZIndex(20)">
        <text>z-index: {{zIndex}}</text>
        <text>点击修改z-index</text>
      </view>
      <view class="common" style="background-color: blue;top: -75px;left: 175px;">
        <text>z-index: 0</text>
      </view>
    </view>
  </view>
</template>

<script>
  export default {
    data() {
      return {
        zIndex: 5
      }
    },
    methods: {
      changeZIndex(zIndex : number) {
        this.zIndex = 20;
        (this.$refs['view'] as UniElement).style.setProperty('z-index', zIndex);
      }
    }
  }
</script>

<style>
.common {
  width: 125px;
  height: 125px;
  justify-content: center;
  align-items: center;
}
.fixed {
  position: fixed;
}
.default {
  background-color: red;
  z-index: 10;
  top: var(--window-top);
}
.specified {
  background-color: green;
  z-index: 5;
  left: 87px;
  /* #ifdef APP */
  top: 87px;
  /* #endif */
  /* #ifdef H5 */
  top: calc(var(--window-top) + 87px);
  /* #endif */
}

.floor {
  background-color: chocolate;
  /* #ifdef APP */
  top: 250px;
  /* #endif */
  /* #ifdef H5 */
  top: calc(var(--window-top) + 250px);
  /* #endif */
  left: 175px;
  z-index: -1;
}
</style>