在 JavaScript 中检查某个类中的对象的值是否已被改变并基于它来更新另一个值?
要检查这一点,请使用 getter 的概念,即 get 属性。以下是代码示例:-
示例
class Student{ constructor(studentMarks1, studentMarks2){ this.studentMarks1 = studentMarks1 this.studentMarks2 = studentMarks2 var alteredValue = this; this.getValues = { get studentMarks1() { return alteredValue.studentMarks1 }, get studentMarks2() { return alteredValue.studentMarks2 } } } } var johnSmith = new Student(78,79) console.log("Before incrementing the result is=") console.log("StudentMarks1="+johnSmith.studentMarks1,"StudentMarks2="+johnSmith.studentMarks2); johnSmith.studentMarks2+=10; console.log("After incrementing the value 10 in the studentMarks2, the result is as follows=") console.log("StudentMarks1="+johnSmith.studentMarks1, "StudentMarks2="+johnSmith.getValues.studentMarks2);
要运行上述程序,你需要使用以下命令:
node fileName.js.
这里,我的文件名是 demo200.js。
输出
这将产生以下输出:
PS C:\Users\Amit\javascript-code> node demo200.js Before incrementing the result is= StudentMarks1=78 StudentMarks2=79 After incrementing the value 10 in the studentMarks2, the result is as follows= StudentMarks1=78 StudentMarks2=89
广告