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Javascript what is the handle, I believe that many people do not have experience in this helpless, this article summarizes the causes of the problem and solutions, through this article I hope you can solve this problem.

A handle is a unique integer value, a 4-byte (8-byte in 64-bit programs) long number, used to identify different objects in an application and different instances of the same class. The advantage of using handles: modifying the function name or code does not require modifying the html call.

Use of JavaScript handles:

vareventUtil={

//add handle

addHandler:function(element,type,handler){

if(element.addEventListener){

element.addEventListener(type,handler,false);

}elseif(element.attachEvent){

element.attachEvent('on'+type,handler);

}else{

element['on'+type]=handler;

}

},

//delete handle

removeHandler:function(element,type,handler){

if(element.removeEventListener){

element.removeEventListener(type,handler,false);

}elseif(element.detachEvent){

element.detachEvent('on'+type,handler);

JavaScript event handler:

An event handler is an event handler that associates a specific event of an element with a function, such as onclick, onmouseover, etc., which point to a given function if the event occurs.

After reading the above content, do you know what is the handle method in javascript? If you still want to learn more skills or want to know more related content, welcome to pay attention to the industry information channel, thank you for reading!

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