Vue3.0监听props方法

时间:2022-05-28 LJJ_3 人气:0

Vue3.0如何监听props

学习vue3.0记录下props监听：

第一种

直接监听这个props

export default defineComponent({
  props: {
    isOpen: Boolean,
  },
  emits: {
    "close-modal": null,
  },
  setup(props, context) {
    watch(
      props,
      (newProps) => {
        console.log(newProps.isOpen); //这里看到新值
      }
    );
    const closeModal = () => {
      context.emit("close-modal");
    };
    return {
      closeModal,
    };
  },
});

第二种

监听里边的某一个属性

export default defineComponent({
  props: {
    isOpen: Boolean,
  },
  emits: {
    "close-modal": null,
  },
  setup(props, context) {
    watch(
      () => props.isOpen,
      (newProps) => {
        console.log(newProps);//查看新值
      }
    );
    const closeModal = () => {
      context.emit("close-modal");
    };
    return {
      closeModal,
    };
  },
});

vue3.0监听props做数据回显

<template>
</template>
<script>
import {defineComponent, reactive, watch} from 'vue';
export default defineComponent({
  name: "from",
  props: {
    record: {
      type: Object,
      default: null,
    }
  },
  setup: function (props, context) {
    const formState = reactive({
      headPic: '',
      nickname: '',
      password: '',
      username: '',
      roleDomainList: []
    });
    /*监听props*/
    watch(props, (nweProps, oldProps) => {
      for (let item in formState) {
        formState[item] = nweProps.record[item];
      }
    });
    return {
      formState
    };
  }
})
</script>
<style scoped>
</style>

以上为个人经验，希望能给大家一个参考，也希望大家多多支持。

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