javascript - 如何将函数中的变量使用到同一类的其他 block 中

Question

如何使用同一类中某个函数的成员来检查同一类中其他 block 中的条件:

class SomeClass{

let whatToDo: string;

public result(){  // want to implement the code but not able to.The only condition is that I want to call it from the Final() function only.

        if ( // the value of latest is not equal to 'addition' ){
             return the value of latest
           }
        else if (// if the value of latest is not equals to 'multiplication'){
              return latest;

        else return;
}

}
public addition(){
    this.whatToDo = 'addition';
     this.Final(this.whatToDo);
      return;
}

public multiplication(){
     this.whatToDo = 'multiplication';
     this.Final(this.whatToDo);
      return;
}

private Final(type:string){

       latest = type;
 }
}

我尝试按如下方式实现上述 result():但它不起作用。

result(){
 if(this.Final.latest != 'addition') {
   return this.Final.latest;
}
 else if (this.Final.latest != 'multiplication') {
    return this.Final.latest;
}
else return;
}

注意:请忽略拼写错误。

Answer 1

如果你想通过this访问，你需要让它成为类的成员并声明它只是whatToDo: string

同时让您的最新也成为类(class)成员。

类似这样的事情。

class SomeClass {

   whatToDo: string;
   latest: string;

   public result() {  

      if (this.latest !== 'addition'){
           return the value of latest
      } else if (this.latest !== 'multiplication'){
            return latest;
      } else {
            return;
      }

   }

   public addition() {
       this.whatToDo = 'addition';
       this.Final(this.whatToDo);
   }

   public multiplication() {
       this.whatToDo = 'multiplication';
       this.Final(this.whatToDo);
   }

   private Final(type:string){ 
       this.latest = type;
   }

}