建议输入框el-autocomplete点击回车下拉框不消失问题

参考：

https://element.eleme.io/?cate_type=all&wd=&eqid=dc610962008b5d910000000565c42296#/zh-CN/component/input#dai-shu-ru-jian-yi

https://blog.csdn.net/honeymoon_/article/details/118158906

解决
当建议框的内容为空的时候建议框会自己收起

<el-autocomplete
		//	加一个ref
        ref="autocomplete"
        class="my-input"
        v-model="sub"
        :fetch-suggestions="querySearch"
        placeholder="输入内容"
        :trigger-on-focus="false"
        @keyup.enter.native="search"
        @select="handleSelect">
        <i slot="suffix" class="el-icon-search" @click="search"></i>
</el-autocomplete>

search() {
	//把suggestions置空
    this.$refs.autocomplete.suggestions = [];
}