JS中如何将类中对象的数字属性转换为数字并与其他数字相加？

发布于 2025-01-09 19:01:27 字数 641 浏览 0 评论 0原文

我想在客户类的方法中将两个值相加。其中一个是数字，另一个是存储在新类中的对象属性，发送方法（ab）工作良好，但接收方法（a+b）不能作为数字工作，因为它是一个对象并且它就像js中的字符串，有什么解决办法吗？

export class Customer {
  constructor(name, password, balance) {
    {
      this.name = name;
      this.password = password;
      this.balance = balance;
    }

    this.send = function (amount) {
      return (this.balance -= amount);
    };
    this.receive = function (amount) {
      return (this.balance += amount);
    };
  }
}

export let student = new Customer("alex", "alex", 200);
export let victim1 = new Customer("tom", "cat", 1000);
export let victim2 = new Customer("jerry", "mous", 500);

原文

I want to add 2 values together at the method in the customer class. one of them is a number and the other is an object property stored in a new class, the send method(a-b) works well, but the receive method(a+b) doesn't work as a number because it's an object and it is like a string in js, what is the solution?

export class Customer {
  constructor(name, password, balance) {
    {
      this.name = name;
      this.password = password;
      this.balance = balance;
    }

    this.send = function (amount) {
      return (this.balance -= amount);
    };
    this.receive = function (amount) {
      return (this.balance += amount);
    };
  }
}

export let student = new Customer("alex", "alex", 200);
export let victim1 = new Customer("tom", "cat", 1000);
export let victim2 = new Customer("jerry", "mous", 500);

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夜唯美灬不弃 2025-01-16 19:01:27

您可以使用一元加运算符进行转换使用前将金额改为数字

class Customer {
  constructor(name, password, balance) {
    {
      this.name = name;
      this.password = password;
      this.balance = balance;
    }

    this.send = function (amount) {
      return (this.balance -= +amount); // magic here
    };
    this.receive = function (amount) {
      return (this.balance += +amount); // and here
    };
  }
}

let student = new Customer("alex", "alex", 200);
let victim1 = new Customer("tom", "cat", 1000);

student.send(victim1.balance);
console.log(student.balance)
student.receive(victim1.balance);
console.log(student.balance)

student.send("500");
console.log(student.balance)
student.receive("100");
console.log(student.balance)

You can use unary plus operator to convert amount to number before use it

class Customer {
  constructor(name, password, balance) {
    {
      this.name = name;
      this.password = password;
      this.balance = balance;
    }

    this.send = function (amount) {
      return (this.balance -= +amount); // magic here
    };
    this.receive = function (amount) {
      return (this.balance += +amount); // and here
    };
  }
}

let student = new Customer("alex", "alex", 200);
let victim1 = new Customer("tom", "cat", 1000);

student.send(victim1.balance);
console.log(student.balance)
student.receive(victim1.balance);
console.log(student.balance)

student.send("500");
console.log(student.balance)
student.receive("100");
console.log(student.balance)

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