How jquery determines whether to bind an event

How jquery determines whether an event is bound: First create a sample file; then use the "$(elem).data("events")[type]" statement to determine whether an event has been bound to the element. .

The operating environment of this tutorial: windows7 system, jquery1.2.6 version, DELL G3 computer.

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jQuery Determine whether the event is bound to the element

Determine whether the event is bound to the element To pass an event, use the following statement

jQuery.data(elem,"events")[type] //老版本也能用 
$(elem).data("events")[type] //1.2.3以后才能用

Return value:

An Object can be traversed using for in. or undefined.

Parameters:

elem is a DOM object, type is the event type.

Example:

Determine whether the click event is bound to the element with id foo

if( $("#foo").data("events")["click"] ){ 
//your code 
}

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