vue3 子组件props

const props = defineProps({
  height: {
    type   : Number,
    default: 200
  },
  width: {
    type   : Number,
    default: 200
  }
})

  props: {
    message: {
      type: String, // type 类型
      required: true, // required 是否必传, true必传 若不传则警告[Vue warn]: Missing required prop: "message"
    },
    count: {
      type: Number,
      default: 0, // default 默认值
    },
    isActive: {
      type: Boolean,
      default: false,
    },
    list: {
      type: Array,
      default: () => [],
    },
    date: {
      type: Date,
      default: () => new Date(),
    },
    user: {
      type: Object,
      default: () => ({ name: 'John Doe', email: 'johndoe@mail.com' }),
    },
    callback: {
      type: Function,
      default: () => {},
    },

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访问props需要这么写

 cHeight.value = props.height