组件官方链接
el-dropdown: 下拉菜单组件
el-dropdown-menu 结合 el-dropdown-item： 下拉菜单项
trigger="click" ： 表示显示下拉菜单内容是由点击事件触发
@command： 绑定点击下拉菜单的内容触发的事件
style="float:left" ：向左靠
<div style="float: right;padding-bottom: 10px"><!--按月--><el-dropdown trigger="click" @command="handleMonthly"><el-button size="mini">{{$t('overview.monthlyStatistics')}}</el-button><el-dropdown-menu slot="dropdown" style="width: 240px;"><el-dropdown-item v-for="item in yearList" :key="item" style="float:left" :command="item">{{item}}</el-dropdown-item></el-dropdown-menu></el-dropdown><!--按季度--><el-dropdown trigger="click" @command="handleQuarterly"><el-button size="mini">{{$t('overview.quarterlyStatistics')}}</el-button><el-dropdown-menu slot="dropdown"><el-dropdown-item v-for="item in yearIntervalList" :key="item" :command="item">{{item}}</el-dropdown-item></el-dropdown-menu></el-dropdown><!--按年--><el-dropdown trigger="click" @command="handleYearly" :hide-on-click="yearlyHideOnClick"><el-button size="mini" @click="yearlyClick">{{$t('overview.yearStatistics')}}</el-button><el-dropdown-menu slot="dropdown" style="width: 240px;"><el-dropdown-item v-for="item in yearList" :key="item" style="float:left" :command="item">{{item}}</el-dropdown-item></el-dropdown-menu></el-dropdown></div>
