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JS Learning Note----Event object

Source: Internet
Author: User
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Event: Events Object, when an event occurs, some detailed information about the event that occurs with the current object is temporarily saved to a specified place-event object, which we can call when needed.

the event object must be used inside a function called by an event to have content. Event function: A function called by an event, a function is not an event function, it is not determined at the time of definition, but depends on the time of the function call.

compatible with:Ie/choreme:event is a built-in global object. Standard Browser: The event object is passed in by the first parameter of the event function.

If a function is called by an event, then the first parameter defined by the function is the event object. Example code: 
1 <!DOCTYPE HTML>2 <HTMLLang= "en">3     <Head>4         <title>Event Object</title>5         <MetaCharSet= "UTF-8">6         <Metaname= "Viewport"content= "Width=device-width, initial-scale=1">7         <Script>8             9             functionfn1 (EV) {Ten                 varEV=EV||event;//compatible wording One                 for(varattrinchev) { A Console.log (attr+ '=' +ev[attr]); //Traverse All Events -                } -             } the fn1 ();//function not called by event - Document.onclick=fn1;//is the function called by the event -  -              +         </Script> -     </Head> +     <Body> A      at     </Body> - </HTML>

　　

JS Learning Note----Event object

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