js判断对象是否是某一类型

<!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>判断对象是否是某一类型</title> <script language="javascript" type="text/javascript"> var obj = new String("脚本之家"); alert(obj instanceof String); </script> </head> <body> </body> </html>
[Ctrl+A 全选 注:如需引入外部Js需刷新才能执行]