Anonymous functions of javascrpt binding events cannot be unbound _ basic knowledge

It is often said that the anonymous function binding event is difficult to control and cannot be unbound. This article will introduce the detailed solution. If you need it, you can refer to it and often hear someone say, the anonymous function binding event is difficult to control, and cannot be unbound. It's always strange who said it cannot be unbound.

Click the event twice and then unbind it automatically.

View code:

The Code is as follows:

Var dom = document. getElementById ("test"), clickt = 0;
Dom. addEventListener ("click", function (e ){
Clickt ++;
Alert ('You touched me '+ clickt +. Touch up to 2 times ');
If (clickt> = 2 ){
This. removeEventListener (e. type, arguments. callee, false );
}
});

Many extension libraries, such as jquery, can achieve custom unbinding:

The Code is as follows:

Var t = 0;
$ (". A"). bind ("click", function (e ){
T ++;
Alert ('You touched me '+ t +. Touch up to 2 times ');
If (t> = 2 ){
$ (This). unbind (e. type, arguments. callee );
}
});

Let's test it for others.