我想實(shí)現(xiàn)無(wú)限321的循環(huán)，if語(yǔ)句怎么改成for循環(huán)
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);
}
?}
2018-06-28
沒(méi)有int,用var