1,HTML source code£º <html> <head> <title>How to use CloneNotSupportedException</title> </head> <body> <script src="jsjava.js"></script> <script> function User(){ this.maxAge=150; } var user=new User(); try{ var user2=user.clone(); }catch(e){ document.write(e.message); } </script> </body> </html> 2,The display text is:

The object,which calls the clone method,need implement the clone method by itself