3 回答var num=0; function startCount() { document.getElementById('count').value=num; num=num+1; setTimeout("startCount()",1000); } startCount();

1 回答關(guān)于var num=document.getElementById("sp").innerHTML;的問(wèn)題

5 回答document.getElementById("second").value=i？

1 回答document.getElementById('txt').value=num;

3 回答function checkone(){ var j=document.getElementById("wb").value; var hobby = document.getElementById("hobby"+j); hobby.checked = true; }