How does HTML stop the timer?
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The difference between interval and delay timer
Interval timer setInterval (fun,time)
Fun is a function that holds the key.
Time is the time interval of execution (in milliseconds). Every time time, the code of "every fun execution" is executed.
# tim {
Width: 100px
Height: 100px
Background: red
Margin: 0 auto
}
/ / interval timer setInterval executes every three seconds
SetInterval (function () {
Alert ("I am a pop-up window with a delay of 3 seconds")
Console.log (1) / / console output 1 every 3 seconds
}, 3000)
Delay timer setTimeout (fun,time)
Fun is a function that holds the key.
Time is the delay execution time (in milliseconds). After the time time, the fun code is executed only for several times.
# tim {
Width: 100px
Height: 100px
Background: red
Margin: 0 auto
}
/ / delay timer setTimeout will only be executed once
SetTimeout (function () {
Alert ("I am a pop-up window with a delay of 3 seconds")
}, 3000)
Three seconds later:
How to stop the timer
ClearInterval clearance interval timer
# tim {
Width: 100px
Height: 100px
Background: red
Margin: 0 auto
}
/ / clear timer
Var timer1=setInterval (function () {
Console.log ("I am the interval timer")
# time is the delay execution time (in milliseconds). Execute the fun code after the time time, and only execute the memory for several times.
}, 1000)
Var timer2=setTimeout (function () {
Console.log ("I am the delay timer")
ClearInterval (timer1)
# the interval output stops after the interval is executed twice. Here, the interval is cleared in the delay, and the delay output is no longer output after one delay.
}, 2000)
ClearTimeout clears the delay timer (that is, when this delay timer, before its delay time is up, I have executed some code here to determine that the code has been executed, and you don't want to execute this timer)
# tim {
Width: 100px
Height: 100px
Background: red
Margin: 0 auto
}
/ / clear timer
Var timer1=setInterval (function () {
Console.log ("I am the interval timer")
ClearTimeout (timer2)
/ / the original output is an interval of one second and a delay of two seconds. The following delay is not output after the delay is cleared, and the interval continues to output.
}, 1000)
Var timer2=setTimeout (function () {
Console.log ("I am the delay timer")
}, 2000)
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