JavaScript: A Beginner's Guide, Fifth Edition by John Pollock & John Pollock

Author:John Pollock & John Pollock [Pollock, John]
Language: eng
Format: azw3
Publisher: McGraw Hill LLC
Published: 2019-11-08T00:00:00+00:00

When the viewer clicks this plain button, an alert will pop up with a greeting. Notice that the rules on the quote marks apply here. Using the onclick event handler as an attribute requires you to use double quotes around all of your JavaScript code, so when you need quote marks for the alert, you use single quotes in order to avoid possible errors.

Also notice that the alert command ends with a semicolon. This enables you to add additional JavaScript code after the alert, which enables you to perform multiple actions on the click event rather than just a single JavaScript statement.

You could code in two alerts if you wanted to do so. All you have to do is remember to include the semicolons to separate the alert commands. This will be a little different because all of the code will be on one line rather than separate lines, as you normally see:

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