需要在模塊中添加:popper-append-to-body=“false”：
<el-autocomplete class="inline-input" :popper-append-to-body="false" placeholder="請輸入部門"
v-model="formInline.deptName" :fetch-suggestions="querySearch"
:trigger-on-focus="false" @select="handleSelect">
</el-autocomplete>
然后再修改css樣式：
.el-popper[x-placement^=bottom] {
width:400px !important;
}
