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Chapter 1. An Overview of Javascript > What Can't You Do with JavaScript?

What Can't You Do with JavaScript?

JavaScript is good, but it's not that good. JavaScript can do many things, but there's a long list of things that it simply can't do. Here's a sampling:

  • You can't write data permanently to a file. For example, you can't take the data from a guest book and add it to a page that displays the messages.

  • You can't access files on the server.

  • You can't access files on the user's computer (except for a special file called a cookie; see Chapter 25, "Creating and Using Cookies" ).

  • You can't glean any information about the user, including her email address or IP address.

  • You can't submit credit card-based purchases for authorization and payment.

  • You can't create multiplayer games.

  • You can't get data from a server database.

  • You can't handle file uploads.


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