javascript - 更新关联数组中每一项的值

Question

我有一个 JavaScript 关联数组，比如:

var myArray = new Object();
myArray["id1"] = "completed";
myArray["id2"] = "notCompleted";
myArray["id3"] = "started";

我怎样才能更新这个数组中每一项的值，这样输出应该是，

myArray["id1"] = "newValue";
myArray["id2"] = "newValue";
myArray["id3"] = "newValue";

Answer 1

使用 Object.keys() 获取所有属性名称数组 然后使用 Array#forEach 迭代它们更新属性值 方法。

var myArray = new Object();
myArray["id1"] = "completed";
myArray["id2"] = "notCompleted";
myArray["id3"] = "started";

Object.keys(myArray).forEach(function(k) {
  myArray[k] = 'newVal';
});

console.log(myArray);

---

使用 while 循环的更快方法。

var myArray = new Object();
myArray["id1"] = "completed";
myArray["id2"] = "notCompleted";
myArray["id3"] = "started";

var names = Object.keys(myArray),
  i = names.length;

while (i--) {
  myArray[names[i]] = 'newVal';
};

console.log(myArray);