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>