求助，有點(diǎn)點(diǎn)問題
<!DOCTYPE html>
<html>
<head>
? ? <meta charset="UTF-8">
? ? <title>獲取驗(yàn)證碼</title>
? ? <style type="text/css">
#proving{color:white;background-color:green}
? ? </style>
?
</head>
<body>
<input type = "button" id=proving value = "驗(yàn)證碼" onclick = "setInterval(validate,1000)";/>
</body>
<script type="text/javascript">
var proving=document.getElementById("proving");
var time=30;
function validate(){
if(time>0){
time=time-1;
proving.value="驗(yàn)證碼"+time;}
if(time==0){
proving.value="驗(yàn)證碼"}
</script>
</html>
2018-12-26
你忘記打括號(hào)了。。最后一個(gè)函數(shù)的結(jié)束括號(hào)沒打。。