vue3 emit binds the parameters passed by the parent component

When we use components, we may need to bind the value of the subcomponent to the parent component.

The parent component passes parameters to the child component through v-model

	  <myEditor
        class="m-top-10"
        :key="editorForm"
        v-model="visitRecordInfo.visit_comment"
      />

The subcomponent gets the passed parameters through props modelValue

	 props: {
	    modelValue: {
	      type: String,
	      default: () => {
	        return "";
	      },
	    },
	  }, // 接收传过来的数据
	  setup(props, context) {
	    // 赋值
	    const valueHtml = ref(props.modelValue);
	    // 监听子组件数据变动 修改父级 modelValue
	    watch(valueHtml,(newValue,oldValue)=>{ 
	      // newValue 新值, oldValue 旧值
	      context.emit('update:modelValue', newValue)
	    })
	   }