使用<el-col>控制输入框的长度

 <el-form-item label="姓名" label-width="80px">
     <el-col :span="15">
         <el-input v-model="form.name" autocomplete="off"></el-input>
     </el-col>
 </el-form-item>

而<el-cascader/>自带居中效果，默认情况下无法与输入框对齐。可设置width:100%

<el-form-item label="省市" label-width="80px">
  <el-col :span="15">
      <el-cascader size="large" :options="pcTextArr" v-model="Options" style="width:100%;">
      </el-cascader>
  </el-col>
 </el-form-item>