"length"の先頭文字"l"は小文字です。
(配列変数名).length
<!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>
<title></title>
<script language="javascript" type="text/javascript">
function proc() {
var data = new Array(4);
data[0] = "Penguin";
data[1] = "Duck";
data[2] = "Pigion";
data[3] = "Hawk";
document.write("配列の長さ:" + data.length + "<br/>");
for (i = 0; i < data.length; i++) {
document.write(data[i]+"<br/>");
}
}
</script>
</head>
<body>
<p>Page</p>
<script language="javascript" type="text/javascript">
proc();
</script>
<p>PageEnd</p>
</body>
</html>
var data = new Array(4);
にて、配列を初期化します。data[0] = "Penguin";
data[1] = "Duck";
data[2] = "Pigion";
data[3] = "Hawk";
にて配列に値を代入します。document.write("配列の長さ:" + data.length + "<br/>");
for (i = 0; i < data.length; i++) {
document.write(data[i]+"<br/>");
}
配列の長さと配列の値を画面に表示します。