Each time it is executed, the current variable value increases by 1

Its effect is equivalent to num = 1

Output the changed value

Each time it is executed, the current variable value increases by 1

Its effect is equivalent to num = 1

Output the current value first and then calculate it

There is no difference between the two when they are used independently.

Generally used independently during development

i post-increment is used relatively often, and is used alone

and

or

Negate

Three ways to use

Simpler way to write if double branch

symbol:? Use with:

Syntax: condition ? Code that meets the conditions for execution: Code that does not meet the conditions for execution

Generally used to get the value

grammar

It can help you better understand the code operation when studying, and you can find bugs faster when working.

1. Press F12 to open the developer tools

2. Click on the sources (source code/source) column

3. Select the code file

It is very similar to the if statement. The condition in the parentheses must be true to execute the code in the loop body.

The code in the while braces will not jump out after it is executed. Instead, it will continue to return to the parentheses to determine whether the conditions are met. If so, it will continue to execute until the conditions in the parentheses are not met, then it will jump out.

variable starting value

Termination condition (without termination condition, the loop will continue to execute, causing an infinite loop)

Variable change value (use auto-increment or auto-decrement)

Exit the entire loop, generally used when the result has been obtained and is not needed in subsequent loops.

Exit this loop, generally used to exclude or skip an option.