针对el-form的数据源是对象嵌套对象，在进行数据绑定和校验时和单层的对象有一点区别，
具体是下面两部分：

数据源：

fromData: {name: '',health: {height: ''}
}

1、 给 el-form-item 的 prop设为：prop="health.height" 。
v-model 设为: v-model="fromData.health.height"

  <el-form-item label="身高" prop="health.height"><el-input v-model="fromData.health.height" clearable /></el-form-item>

2、校验规则rules对象对应的key设置为数据源内部的值: 'health.height'

rules: {'health.height': [{ required: true, message: '请输入身高', trigger: 'blur' }]
}

具体代码

<template><div><el-form ref="fromRef" :model="fromData" :rules="rules"><el-form-item label="姓名" prop="name"><el-input v-model="fromData.name" clearable /></el-form-item><el-form-item label="身高" prop="health.height"><el-input v-model="fromData.health.height" clearable /></el-form-item></el-form><el-button @click="onSubmit()">提交</el-button></div>
</template><script>
export default {data() {return {fromData: {name: '',health: {height: ''}},rules: {name: [{ required: true, message: '请输入姓名', trigger: 'blur' }],'health.height': [{ required: true, message: '请输入身高', trigger: 'blur' }]}}},methods: {onSubmit() {this.$refs['fromRef'].validate((valid) => {if (valid) {console.log('校验通过')console.log('fromData', JSON.stringify(this.fromData))}})}}
}
</script><style scoped></style>