JavaScript, call (), apply (), bind () usage

" Use strict " ;
 var name = ' Wang ' , Age = 10 ;
 var obj = { 
    name: ' Li ' , 
    Age: 20 is , 
    getInfo ( from , to) { 
        the console.log (arguments) 
        the console.log ( the this + .name ' age is ' + the this .age + ' from: ' + from + ' to: ' + to); 
    } 
};

var DB = {name: ' Omura ' , Age: 96 }; 

obj.getInfo.call (DB, ' Beijing ' , ' Nanjing ' ); 
obj.getInfo.apply (DB, [ ' Inner Mongolia ' , ' Xinjiang ' , ' Villa ' ]); 
obj.getInfo.bind (DB, ' Shanghai ' , ' Tianjin ' ) ();

Above the latter method more months bind (), the result is returned all the way!

It follows that, bind returns a new function, you must call it will be executed.

Subtle gap!

It is obvious from the above four results:

call, bind, the first argument apply these three functions are pointing to this object, the second parameter is the difference came:

The call is to go directly into the parameter, the second and third n-th argument all separated by commas , directly into the back obj.myFun.call (db, 'Chengdu', ..., 'string') .

All parameters apply must be placed on a array which pass in obj.myFun.apply (DB, [ 'Chengdu', ..., 'String'] ).

In addition to returning a function other than bind, its parameters and the same call.

Of course, the parameter string is not limited to three types, allowing various types, including functions, object like!