Question

我正在寻找另一种替换此句子的方法。（counter.set =（值）=> count =值; counter.decrease =（）=。count-）我该怎么办？？

   function makeCounter() {
      let count = 0;
    
      function counter() {
        return count++
      }

      // Issue --
      counter.set = (value) => count = value;
      counter.decrease = () => count--;
      // End of issue --

      return counter;
    }
    
    let counter = makeCounter();
    
    alert( counter() ); // 0
    alert( counter() ); // 1
    
    counter.set(10); // set the new count
    
    alert( counter() ); // 10
    
    counter.decrease(); // decrease the count by 1
    
    alert( counter() ); // 10 (instead of 11)

Answer 1

您需要使用new关键字进行更改...也可以使用class

 class makeCounter  {
    constructor(){
       this.count = 0;
    }
      
      function counter() {
        return count++
      }

      set(value){ this.count = value;}
     decrease(){this.count-- ;}

      
    }
    
    let counter =new makeCounter();
    
    alert( counter() ); // 0
    alert( counter() ); // 1
    
    counter.set(10); // set the new count
    
    alert( counter() ); // 10
    
    counter.decrease(); // decrease the count by 1
    
    alert( counter() ); // 10 (instead of 11)

Answer 2

您可以使用课程

class Counter {
  constructor() {
    this.count = 0;
  }
  
  set(value) {
    this.count = value;
  }
  
  increase(value) {
    this.count += (value || 1);
  }
  
  decrease(value) {
    this.count -= (value || 1);
  }
}

const counter = new Counter();

console.log(counter.count);

counter.increase();

console.log(counter.count);

counter.increase();

console.log(counter.count);

counter.increase(10);

console.log(counter.count);

counter.decrease();

console.log(counter.count);

counter.decrease(2);

console.log(counter.count);

我不知道还有其他办法吗？ Java脚本

2 个答案: