更新关联数组中每个项目的值

Question

我有一个JavaScript关联数组，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目的值，以便输出应为：

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方法遍历它们，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); 

Answer 2

• 用于循环
• 始终建议使用hasOwnProperty来仅在非继承属性上进行迭代。

 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);