<el-button @click="increase">自增</el-button>

import { reactive, toRefs, onMounted, getCurrentInstance, ref } from 'vue'
export default {
    setup() {
      const state = reactive({
          input: '',
          nub: '',
          time: '',
          cont: 1
      })
      const Counter = ref(0)
      const increase = () => {
	      //第一种方法
	      console.log(state.cont ++)
	      //第二种方法
	      console.log(Counter.value++)
      }
      return {...toRefs(state), onMounted, increase, Counter}
    }