Question

我有一个JavaScript关联数组，比如说：

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

如何更新此数组中每个项的值，以便输出

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 方法迭代更新属性值。

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循环的速度更快。

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);

Answer 2

用于循环
始终建议使用hasOwnProperty仅迭代非继承的属性。

＆＃13;

var myArray = new Object();
myArray["id1"] = "completed";
myArray["id2"] = "notCompleted";
myArray["id3"] = "started";

for (var prop in myArray) {
  if (myArray.hasOwnProperty(prop)) {
    myArray[prop] = 'newValue';
  }
}

console.log(myArray);

＆＃13;

更新关联数组中每个项的值

2 个答案: