data.uvue

<template>
  <view class="page">
    <view class="row">初始值: <text>1</text></view>
    <view class="row">data.val: <text class="val">{{val}}</text></view>
    <view class="row">data._val: <text class="_val">{{_val}}</text></view>
    <view class="row">data.$val: <text class="$val">{{$val}}</text></view>
    <view class="buttons">
      <button class="btn plus" @click="click(1)">增加</button>
      <button class="btn minus" @click="click(-1)">减少</button>
    </view>
  </view>
</template>

<script lang="ts">
export default {
  data () {
    return {
      val: 1,
      _val: 1,
      $val: 1
    }
  },
  methods: {
    click (num: number) {
      this.val += num
      this._val += num
      this.$val += num
    }
  }
}
</script>

<style>
  .page {
    font-size: 16px;
  }
  .row {
    display: flex;
    flex-direction: row;
    justify-content: space-between;
    margin-bottom: 10px;
  }
  .buttons {
    display: flex;
    flex-direction: row;
    margin-top: 10px;
  }
  .btn {
    flex: 1;
    margin: 0 5px;
  }
</style>