vue composition api 访问 原vue2中 this.$refs

 1 <el-form class="user-form" ref="ruleFormRef" :model="userForm" status-icon :rules="rules">
 2     <el-form-item label="原密码" prop="oldPass">
 3       <el-input type="password" v-model="userForm.oldPass" auto-complete="off"></el-input>
 4     </el-form-item>
 5     <el-form-item label="新密码" prop="pass">
 6       <el-input type="password" v-model="userForm.pass" auto-complete="off"></el-input>
 7     </el-form-item>
 8     <el-form-item label="确认密码" prop="checkPass">
 9       <el-input type="password" v-model="userForm.checkPass" auto-complete="off"></el-input>
10     </el-form-item>
11     <el-form-item>
12       <el-button type="primary" @click="changePassword('userForm')">修改密码</el-button>
13     </el-form-item>
14   </el-form>

由于composition api采用函数组合方式编程，无法使用 this 访问vue实例，故无法使用 this.$refs.ruleFormRef 访问form表单。

可在 setup 中声明一个具有相同 ruleFormRef 名称的 ref ，初始化为 null ：

 1 export default {
 2   setup(props) {
 3     // Refs
 4     const ruleFormRef= ref(null);
 5
 6     // Hooks
 7     onMounted(() => {
 8       console.log("ruleFormRef: ", ruleFormRef.value);
 9     });
10
11     return {
12       ruleFormRef
13     };
14   }
15 };

现在你可以通过 ruleFormRef.value 访问form表单。