我想實現無限321的循環，if語句怎么改成for循環
var num=0;
function numCount(){
?????document.getElementById('txt').value=num;
????if(num<3){
?????????num=num+1;
????????setTimeout("numCount()",1000);
????}else{
????????num=0;
????????setTimeout("numCount()",1000);
}
?}
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2018-06-28
沒有int,用var