jQuery callbacks.has () method
Examples
Use callbacks.has () to check whether to add the list had a callback
$ (Function () {
// Will be added to the list a simple function
var foo = function ( value1, value2 ) {
alert ( "Received:" + value1 + " ," + value2 );}; // A second function which will not be added to the list
var bar = function ( value1, value2 ) {
alert ( "Foobar" );}
var . callbacks = $ Callbacks (); // add the function to the list
callbacks. add ( foo ); Alert ( callbacks. has ( foo ) ); // True
alert ( callbacks. has ( bar ) ); // False
})
try it"
Definition and Usage
callbacks.has () function is used to determine whether to add the callback list through a callback function.
grammar
callbacks.has( callback )
| 参数 | 描述 |
|---|---|
| callback | Function类型 用来查找的回调函数 |