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A brief analysis of JavaScript timer _ basic knowledge

Source: Internet
Author: User
Tags setinterval
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SetTimeout ()--Used to specify a program to be executed after a certain period of time.

Format:

[Timer object name =]settimeout ("< expression >", number of milliseconds);

Function: Execute < expression > once.

Where an expression is a string, you can make any JavaScript statement

Copy Code code as follows:

<script type= "Text/javascript" >
Execute alert after 5 seconds.
function count () {
SetTimeout ("Alert (' execution success ');", 5000);
}
</script>
<body>
<input type= "button" value= "Execute" onclick= "count ()" >
</body>

SetInterval ()-Repeat execution < expression until the window, frame is closed, or executed clearinterval

Format: [Timer object name =]setinterval ("< expression >", ms)

Clearinterval () Termination timer

Format: clearinterval (Timer object name)

Copy Code code as follows:

<script type= "Text/javascript" >
var sec=0;
var timeid=setinterval ("Count ();", 1000);

function count () {
document.getElementById ("num"). innerhtml=sec++;
}

function Stopcount () {
Clearinterval (Timeid);
}
</script>
<body>
<font style= "color:red" id= "num" >0</font> sec <input type= "button" value= "Stop" onclick= "Stopcount ();" >
</body>

is not very easy to use, there is a need for small partners under the reference bar.

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