toJSON

toJSON()方法将Goal对象转换为JSON格式的对象。

语法

toJSON()

返回值

返回JSON格式的对象。

示例

const goal = new Goal("Learn JavaScript", "Strengthen coding skills", 
                       new Date(2022, 11, 31), 10, true);
const goalJSON = goal.toJSON();
console.log(goalJSON);

输出结果：

{
  "title": "Learn JavaScript",
  "description": "Strengthen coding skills",
  "dueDate": "2022-12-31T08:00:00.000Z",
  "priority": 10,
  "completed": true
}

备注

该方法只能用于Goal对象。如果要转换其他类型的对象，请使用内置的JSON.stringify()方法。

示例代码

class Goal {
  constructor(title, description, dueDate, priority, completed) {
    this.title = title;
    this.description = description;
    this.dueDate = dueDate;
    this.priority = priority;
    this.completed = completed;
  }
  
  toJSON() {
    return {
      title: this.title,
      description: this.description,
      dueDate: this.dueDate.toISOString(),
      priority: this.priority,
      completed: this.completed
    };
  }
}

const goal = new Goal("Learn JavaScript", "Strengthen coding skills", 
                       new Date(2022, 11, 31), 10, true);
const goalJSON = goal.toJSON();
console.log(goalJSON);