父组件prop传向子组件的值，被子组件直接v-model绑定功能不生效

隐式修改组件属性会导致功能异常

实际操作中发现，即便是父组件把简单数据通过prop传给了子组件，子组件再使用v-model绑定，也不行，响应式还是对异常

原vue2业务中存在组件定义某个类型为Object的属性，然后将该属性对象的属性值绑定给v-model的用法，在此种场景会导致隐式修改组件属性，vue3中是禁止的，此种方式目前不报错，但是响应式不正确生效，功能会不正常。请修改掉。

例子一：

针对常规将props属性赋值给组件内如 input的v-model，因v-model会双向修改值，形成修改属性，此场景推荐用如下方式,两者均可：

方式1修改：

// vue2 ,vue2中会警告但是能运行正常，vue3中无法正常运行
<el-input v-model="searchValue"/>
props:{searchValue:{type:String,default:""}
}
// vue3可用如下替代方案,
// compoentA.vue
<el-input v-model="searchValueLocal"/>
props:{searchValue:{type:String,default:""}
},
computed:{searchValueLocal:{get(){return this.searchValue;},set(val){this.$emit("update:searchValue",val) // 更新searchValue值}}
}
// compoentB.vue使用 compoentA.vue
<compoent-b v-model:search-value="text"/>
data(){return{text:''}
}

方式2修改
将v-model语法糖拆开

v-model语法糖本质是绑定modelValue,并绑定update:modelValue=val=>this.modelValue=val,导致形成属性修改，只要将语法糖拆开即可避免直接修改属性

// compoentA.vue
<el-input :model-value="modelValue" @update:model-value="handleSelectChange"/>
props:{modelValue:{type:String,default:""}
},
methods:{handleSelectChange(val){this.$emit('update:modelValue', val); // 值更新抛给父组件，由父组件来更新修改modelValue的值}
}

例子二:

如下代码：

1）问题：定义了data组件属性，但是将属性绑定给el-form的model属性，和各表单组件的v-model;此时形成了隐式操作组件属性的问题，对于el-form的model和各表单组件的v-model，无法形成响应式，会产生实际填写内容但是表单校验提示未输入内容，表单输入更新不及时的问题。

2）解决：在组件内部直接修改属性的方式改掉，改成单向数据流或者在data中定义变量中转；同时注意，对于computed的计算属性（理论上是只读），也不能做值修改，会不触发响应式原理

<template><div class="label-form"><el-form :model="data" label-position="top" :rules="rules" ref="labelForm" label-width="10rem" @submit.prevent><el-form-item :label="$t('name')" prop="Name"><el-input @click.stop="focusTag" ref="tag" v-model="data.Name" v-input-permit.name :placeholder="$t('tag_name')"></el-input></el-form-item><el-form-item :label="$t('description')" prop="Describe"><el-inputtype="textarea"@click.stop="focusDesc"ref="desc":count="128":autosize="{ minRows: 2, maxRows: 4, maxWidth: 300 }"v-model="data.Describe"v-input-permit.name:placeholder="$t('description')"></el-input></el-form-item><el-form-item class="form-buttons"><el-button type="primary" @click="onSubmit">{{ $t('btn_save') }}</el-button></el-form-item></el-form></div>
</template><script>
import rules from '@/Common/service/rule/validate-rules';
export default {name: 'LabelForm',props: {data: {type: Object,default() {return {Name: '',Describe: ''};}}},emits: ['onSubmit'],data() {return {rules: {Name: [rules.required, rules.name],Describe: [rules.textareaDescription]}};},methods: {onSubmit() {this.$refs['labelForm'].validate(async (valid) => {if (valid) {this.emit('onSubmit', this.data);} else {this.$refs['labelForm'].focusFirstField();return false;}});},reset() {this.$refs['labelForm'].resetFields();},focusTag() {const inputDom = this.$refs.tag.$el.querySelector('input');inputDom.focus();},focusDesc() {const inputDom = this.$refs.desc.$el.querySelector('textarea');inputDom.focus();}}
};
</script>// ai帮改
<template><div class="label-form"><el-form :model="formData" label-position="top" :rules="rules" ref="labelForm" label-width="10rem" @submit.prevent><el-form-item :label="$t('name')" prop="Name"><el-input @click.stop="focusTag" ref="tagRef" v-model="formData.Name" v-input-permit.name :placeholder="$t('tag_name')"></el-input></el-form-item><el-form-item :label="$t('description')" prop="Describe"><el-inputtype="textarea"@click.stop="focusDesc"ref="descRef":count="128":autosize="{ minRows: 2, maxRows: 4 }"v-model="formData.Describe"v-input-permit.name:placeholder="$t('description')"></el-input></el-form-item><el-form-item class="form-buttons"><el-button type="primary" @click="onSubmit">{{ $t('btn_save') }}</el-button></el-form-item></el-form></div>
</template><script>
import { ref, reactive, onMounted } from 'vue';
import rules from '@/Common/service/rule/validate-rules';export default {name: 'LabelForm',props: {data: {type: Object,default() {return {Name: '',Describe: ''};}}},emits: ['onSubmit'],setup(props, { emit }) {const labelForm = ref(null);const tagRef = ref(null);const descRef = ref(null);const formData = reactive({ ...props.data });const rules = {Name: [rules.required, rules.name],Describe: [rules.textareaDescription]};const onSubmit = () => {labelForm.value.validate((valid) => {if (valid) {emit('onSubmit', formData);} else {labelForm.value.focusFirstField();return false;}});};const reset = () => {labelForm.value.resetFields();};const focusTag = () => {const inputDom = tagRef.value?.$el.querySelector('input');inputDom?.focus();};const focusDesc = () => {const inputDom = descRef.value?.$el.querySelector('textarea');inputDom?.focus();};return {labelForm,tagRef,descRef,formData,rules,onSubmit,reset,focusTag,focusDesc};}
};
</script>