為啥我的代碼會(huì)彈出2次提示框
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>我們互動(dòng)下</title>
<script type="text/javascript">
alert("關(guān)注JS高級(jí)篇");
</script>
</head>
<body>
?<h1>JS進(jìn)階篇</h1>?
</body>
</html>
2017-12-18
可能是瀏覽器的問(wèn)題，在我的電腦上沒(méi)有