page is initialized. I set the delay in mounted:

HTML section:

<el-select ref="selector" filterable remote ....

JS section:

mounted() {
  setTimeout(() => {
    this.$refs.selector.focus()
  }, 500)
}

performance:

does set focus normally, but the problem is that only sets focus and cannot enter !
must click Enter again to show the normal Input style and can be typed properly.