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This article mainly explains "JavaScript code block and keyword example analysis". Interested friends may wish to have a look. The method introduced in this paper is simple, fast and practical. Next let the editor to take you to learn "JavaScript code blocks and keyword example analysis" bar!

JavaScript program

A computer program is a series of "instructions"executed" by a computer.

In programming languages, these programming instructions are called statements.

JavaScript code block

JavaScript statements can be combined in code blocks with curly braces ({...}).

The purpose of the code block is to define the statements to be executed together.

You will see statements grouped together in blocks in JavaScript:

Example

Function myFunction () {

Document.getElementById ("demo") [xss_clean] = "Hello Kitty."

Document.getElementById ("myDIV") [xss_clean] = "How are you?"

}

Note: we have indented 4 spaces for the code block in this tutorial.

Tip: you'll learn more about functions later in this tutorial.

JavaScript keyword

JavaScript statements often identify JavaScript actions that need to be performed by a keyword.

The following table lists some of the keywords that will be learned in the tutorial:

Keyword description

Break terminates the switch or loop.

Continue jumps out of the loop and starts at the top.

Debugger stops executing JavaScript and calls the debug function, if available.

Do... While executes the statement block and repeats the code block when the condition is true.

For marks the block of statements that need to be executed, as long as the condition is true.

Function declares the function.

If... Else marks the block of statements that need to be executed, according to a condition.

Return exits the function.

Switch marks the block of statements that need to be executed, depending on the situation.

Try... Catch implements error handling for statement blocks.

Var declares variables.

Note: the JavaScript keyword refers to reserved words. Reserved words cannot be used as variable names.

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