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2025-04-06 Update From: SLTechnology News&Howtos shulou NAV: SLTechnology News&Howtos > Development >
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This article is about how to use the callbacks.has () method. The editor thinks it is very practical, so share it with you as a reference and follow the editor to have a look.
Callbacks.has (callback)
Description: determines whether a callback is provided in the list
Added version: 1.7callbacks.has (callback)
Callback
Type: Function ()
The callback function used to find.
Example:
Use callbacks.has () to check if a callback is provided in the list:
/ / a sample logging function to be added to a callbacks list
Var foo = function (value1, value2) {
Console.log ("Received:" + value1 + "," + value2)
}
/ / a second function which will not be added to the list
Var bar = function (value1, value2) {
Console.log ("foobar")
}
Var callbacks = $.Callrooms ()
/ / add the log method to the callbacks list
Callbacks.add (foo)
/ / determine which callbacks are in the list
Console.log (callbacks.has (foo))
/ / true
Console.log (callbacks.has (bar))
/ / false
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