JavaScript timer example analysis _ javascript skills

This article mainly introduces the JavaScript timer example analysis. For more information, see 1. what is a JavaScript timer?

In JavaScript, we can execute code after the set interval, rather than immediately after the function is called.

2. timer type

One-time timer: triggered only once after the specified delay time.
Interval trigger timer: triggered at a certain interval.

3. timer method

1): one-time timer

A): setTimeout (): executes the code after the specified delay time.

Syntax: setTimeout (code, latency );

Parameter description:

1. the function to be called or the code string to be executed.
2. latency: The waiting time before code execution, in milliseconds (1 s = 1000 ms ).

B): clearTimeout (): cancels the setTimeout () setting.

Syntax: clearTimeout (timer)

Parameter description:
Timer: the ID value returned by setTimeout. This value identifies the delayed execution code block to be canceled.

Call the setTimeout () and clearTimeout () latency methods:

The code is as follows:

JavaScript timer