reactive

• 示例

<template>
  <div>
    <button @click="increase">被点击了{{obj.count}}次</button>
  </div>
</template>
  import { createComponent, reactive } from '@vue/composition-api'
  export default createComponent({
    setup() {
      const obj = reactive({ count: 0 })
      const increase = () => {
        obj.count++
      return {
        obj,
        increase
      }
    }
  })
</script>