23 - 自定义ref

[webfanrc]

<script setup>
import { watch, customRef } from "vue"

/**
 * Implement the function
*/
function useDebouncedRef(value, delay = 200) {
  let timeout;
  return customRef((track, trigger) => ({
    get() {
      track() // 用于依赖追踪
      return value
    },
    set(newValue) {
      clearTimeout(timeout);
      timeout = setTimeout(function(){
        value = newValue;
        trigger(); // 用于出发更新
      }, delay)
    }
  }))
}
const text = useDebouncedRef("hello")

/**
 * Make sure the callback only gets triggered once when entered multiple times in a certain timeout
*/
watch(text, (value) => {
  console.log(value)
})
</script>

<template>
  <input v-model="text" />
</template>