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JavaScript Timing Events
By using JavaScript, we have the ability to execute code after a set interval of time, not immediately after the function is called. We call this a timing event.
It is easy to use timing events in JAVASCRITP, and two key methods are:
SetInterval () interval specifies the number of milliseconds to execute the specified code repeatedly
GrammarWindow.setinterval ("JavaScript function", milliseconds);The Window.setinterval () method can use the function setinterval ()directly without using the window prefix.
SetInterval () The first parameter is a function.
The number of milliseconds for the second parameter interval
PS: 1000 milliseconds is one second.
How do I stop execution?The Clearinterval () method is used to stop the function code executed by the SetInterval () method.
GrammarWindow.clearinterval (intervalvariable)
The Window.clearinterval () method can use the function clearinterval ()directly without using the window prefix.
To use the Clearinterval () method, you must use a global variable when you create the timing method:
Myvar=setinterval ("JavaScript function",milliseconds);
You can then use the Clearinterval () method to stop execution.
2.setTimeout () method syntaxT=window.settimeout (JavaScript function ", number of milliseconds);
The SetTimeout () method returns a value. In the above statement, the value is stored in a variable named T. If you want to cancel the setTimeout (), you can use the variable name to specify it.
The first argument to SetTimeout () is a string containing a JavaScript statement. This statement may be such as "alert (' 5 seconds! ')" or a call to a function, such as alertmsg () ".
The second parameter indicates how many milliseconds from the current start to execute the first parameter.
How do I stop execution?The Cleartimeout () method is used to stop executing the function code of the SetTimeout () method.
GrammarWindow.cleartimeout (timeoutvariable)
The window.cleartimeout () method can not use the window prefix.
To use the Cleartimeout () method, you must use a global variable in the Create Timeout method (SetTimeout):
Myvar=settimeout ("JavaScript function",milliseconds);
If the function has not yet been executed, you can use the Cleartimeout () method to stop executing the function code.
The following code is my previous click on the conversion picture code of the upgraded version, that is, every 3 seconds to automatically convert a picture
<!DOCTYPE HTML><HTML><Head><MetaCharSet= "Utf-8"></Head><Bodyonload= "Gaigai ()"><Script>functionGaigai () {setinterval (function() {element=document.getElementById ('im') if(Element.src.match ("2") ) {element.src="./1.jpg"; } Else{element.src="./2.jpg"; }}, the);}</Script><imgID= "Im"src= "./2.jpg" /></Body></HTML>
jsの Timer
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