el-button autofocus 无效(解决办法)

<el-button type="primary" autofocus="true" v-focus round plain>日常检查</el-button>

directives: {
      focus: {
         inserted: function(el) {
           el.focus();
         }
     }
}

上面的方法就可以达到我开始想要的效果 ( v-focus )