[Vue]el-radio想要传入全部类型时，label绑定空字符串

记录一下，原本以为不可以这样绑的。这样就可以空查了。

 

<el-form-item label="类型" prop="type">
  <el-radio label="" v-model='query.type' @change="handleQuery">全部</el-radio>
  <el-radio label="1" v-model='query.type' @change="handleQuery">类型1</el-radio>
  <el-radio label="2" v-model='query.type' @change="handleQuery">类型2</el-radio>
  <el-radio label="3" v-model='query.type' @change="handleQuery">类型3</el-radio>
  <el-radio label="4" v-model='query.type' @change="handleQuery">类型4</el-radio>
</el-form-item>