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This article mainly explains "what is the judgment structure of javascript". The content of the explanation is simple and clear, and it is easy to learn and understand. Please follow the editor's train of thought to study and learn "what is the judgment structure of javascript".

Judgment structure: 1, if conditional branch structure, including if, "if else", "if else if …", "if else if … else" statements; 2, "switch case" conditional branch structure; 3, ternary operation structure, grammar "condition? expression 1: expression 2".

The operating environment of this tutorial: windows7 system, javascript1.8.5 version, Dell G3 computer.

Branch structure is our common judgment structure, according to the conditions set by the user to determine whether to execute certain code programs, the following Xiaoqian will introduce to you three common branch structure syntax.

IF conditional branching structure

If statement

An if statement is used to determine whether the code is executed or not

Syntax: if (condition) {Code to be executed}

Determine whether the code in {} is executed by whether the condition in () is true or not.

If else statement

Decide which {} code to execute according to the if condition

Syntax: if (condition) {execute when condition is true} else {execute when condition is false}

One of the code within the two {} must be executed

If else if... Statement

You can use if and else if to set multiple conditions to judge

Syntax: if (condition 1) {execute when condition 1 is true} else if (condition 2) {execute when condition 2 is true}

If the first condition is true, then the content in the following {} will be executed.

If the first condition is false, then the second condition is judged, and so on.

Of multiple {}, only one will be executed. Once there is a condition of true, the latter will not be judged.

If else if... Else statement

And the previous if else if... Basically the same, but when all the conditions are not met, execute the {} after the last else

SWITCH conditional branching structure

It is also a kind of conditional judgment sentence, which is the judgment of a certain variable.

Syntax:

To judge that a variable is equal to a certain value to use

Example: the number given according to the variable shows what day it is

Ternary operation (extension)

Ternary operation is to use two symbols to form a statement.

Ternary operation is just an abbreviated form of if else statement.

Grammar: condition? Execute when condition is true: execute when condition is false

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