如何在Angular 4+[复制]中更新贴图的现有键的值

是否有任何方法可以更新angular 4+中创建的键值对映射的值。

假设我有:

testMap: Map<number, string> = new Map<number, string>();

ngOnInit() {
    this.testMap.set(1, "A");
    this.testMap.set(2, "B");
    this.testMap.set(3, "C");
    this.testMap.set(4, "D");
    this.testMap.set(5, "E");
}

changeValue(id){
    //id is the one of the keys of the map whose value needs to be altered
    //let say (id=3)
    this.testMap.put(id,"ChangedValue"); //PUT is from java
}