為啥輸出來上網(wǎng)是未定義的呀？
<!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>數(shù)組長度</title>
<script language="javascript">
?var mynum=new Array(65,90,88,98);
? ? ?
?document.write("數(shù)組的長度是:"+mynum.lenght);
</script>
</head>
<body>
</body>
</html>
2019-06-20
?document.write("數(shù)組的長度是:"+mynum.lenght);
打錯(cuò)了 是length