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<el-button type="success" plain size="mini" autofocus="true" @click="countCollum('countele')">充电电量</el-button>
<el-button type="success" plain size="mini" @click="countCollum('countnum')">充电次数</el-button>
<el-button type="success" plain size="mini" @click="countCollum('countTime')">充电时长</el-button>
<el-button type="success" plain size="mini" @click="countCollum('countAvg')">平均充电量</el-button>
<el-button type="success" plain size="mini" @click="countCollum('countMax')">最大充电量</el-button>
使用 autofocus=“true”