The function of Message () {
Enclosing _list=[]; 
This. MSG='hello' 
} 
Message. The prototype. The attach=function (hero) {
This. _list. Push (hero) 
}; 
Message. The prototype. Notify=function () {
For (var I=0; IEnclosing _list [I] the update (); 
} 
}; 
Message. The prototype. SetState=function (MSG) {
This. MSG=MSG; 
This. Notify () 
}; 
Message. The prototype. GetState=function () {
Return this. MSG 
}; 

After the call display this. _list [I]. The update is not a function

CodePudding user response:

Then look at your enclosing _list array what is put inside, put the element on the prototype chain of must have the update method, otherwise will be an error,