动态设置动态对象的属性

var obj = {};
obj.name = "John";
console.log(obj.name);  // 输出 "John"

var obj = {};
var propName = "name";
obj[propName] = "John";
console.log(obj.name);  // 输出 "John"

import java.lang.reflect.Field;

public class Main {
    public static void main(String[] args) throws Exception {
        MyClass obj = new MyClass();
        Class<?> cls = obj.getClass();
        Field field = cls.getDeclaredField("name");
        field.setAccessible(true);
        field.set(obj, "John");
        System.out.println(obj.getName());  // 输出 "John"
    }
}

class MyClass {
    private String name;

    public String getName() {
        return name;
    }
}