How can jquery determine whether an element is bound to an event?

Jquery method to determine whether an element is bound to an event: 1. The old version of the judgment statement [jQuery.data(elem, "events") [type]]; 2. [1.2.3] version can only be used after [$(elem).data("events")[type]].

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Jquery method to determine whether an element is bound to an event:

To determine whether an event has been bound to an element, 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, which 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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