JavaScript programmers commonly use the commands shown in the following table for controlling dialog-based input and output in programs to be used on the Web.
| Element | Description |
|---|---|
| alert("message"); | Creates a popup dialog containing "message." |
| stringVar = prompt("message") | Send message to user in a dialog box, retrieve text input from user and store it in stringVar. |
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Source:http://www.dummies.com/how-to/content/basic-io-commands-in-javascript.html
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