請問哪里出了問題?
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>string對象 </title>
? <script type="text/javascript">
? var mystr="I love JavaScript!"
? document.write(mystr.charAt(mystr.length-1);
</script>
</head>
<body>
</body>
</html>
2019-01-16
少個分號和括號
2019-01-16
謝謝了