加中括号怎么没显示？
<!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>数组赋值</title>
<script language="javascript">
var myarr=new Array[66,80,90,77,59];
document.write("数组第一个值是:"+myarr+"<br>");
</script>
</head>
<body>
</body>
</html>
