<el-input
ref="tabInput"
type="textarea"
:rows="10"
@keydown.9.native.prevent="tabInput"
v-model="tabContent">
</el-input>
tabInput(e){
const elInput=e.target
const startPos = elInput.selectionStart
const endPos = elInput.selectionEnd
if(startPos===undefined||endPos===undefined)return
const txtValue=elInput.value
elInput.value=txtValue.substring(0,startPos)+'\t'+txtValue.substring(endPos)
elInput.focus()
elInput.selectionStart=startPos+'\t'.length
elInput.selectionEnd=endPos+'\t'.length
this.tabContent=elInput.value
},