vue 修改 element-ui select组件样式坑

<el-select 
	v-if="options.length > 0" 
	@change="handleSelectKeyChange" 
	:value="searchKey" 
	slot="prepend" 
	style="width:110px" 
	placeholder="请选择" 
	:popper-append-to-body="false" 
	popper-class="select-popper">
	<el-option 
		v-for="item in options" 
		:label="item.label" 
		:value="item.value" 
		:disabled="item.disabled" 
		:key="item.value">
	</el-option>
</el-select>

 :popper-append-to-body="false" // options  默认不在#app元素中显示
 popper-class="select-popper"   // 必须 提供当前类名，否则---无法修改

/deep/.select-popper {
	.el-select-dropdown__item.selected {
		font-weight: normal;
	}
}