What is a handle in javascript
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.
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