謮取ID document.activeElement.id | select | 手指指標 |

111 222 333 444 this select id ="st8523"
this id ="BT_1"
this id ="BT_2"
this id ="BT_3"
this id ="BT_4"

button style="cursor:pointer" 變更為手指指標

document.getElementById('st8523').selectedIndex=0 to 3 可改變select選擇 }

select | input | onclick | width | style | font-size | tbody | cursor: pointer;| font-size: | 謮取ID document.activeElement.id | select | 手指指標 |