Simple statements in JavaScript are generally followed by a semicolon character, just as they are in C, C++, and Java. This serves to separate them from the following statement. In JavaScript, however, you are allowed to omit this semicolon if your statements are each placed on a separate line. For example, the following code could be written without semicolons:
a =index.html 3; b = 4;
But when formatted as follows, the semicolons are required:
a =index.html 3; b = 4;
Omitting semicolons is not a good programming practice; you should get in the habit of using them.
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