From 33058f2b292b3a581333bdfb21b8f671898c5060 Mon Sep 17 00:00:00 2001 From: Peter Bengtsson Date: Tue, 8 Dec 2020 14:40:17 -0500 Subject: initial commit --- .../global_objects/object/values/index.html | 113 +++++++++++++++++++++ 1 file changed, 113 insertions(+) create mode 100644 files/zh-cn/web/javascript/reference/global_objects/object/values/index.html (limited to 'files/zh-cn/web/javascript/reference/global_objects/object/values/index.html') diff --git a/files/zh-cn/web/javascript/reference/global_objects/object/values/index.html b/files/zh-cn/web/javascript/reference/global_objects/object/values/index.html new file mode 100644 index 0000000000..42d9cced00 --- /dev/null +++ b/files/zh-cn/web/javascript/reference/global_objects/object/values/index.html @@ -0,0 +1,113 @@ +--- +title: Object.values() +slug: Web/JavaScript/Reference/Global_Objects/Object/values +tags: + - JavaScript + - Method + - Object + - Reference +translation_of: Web/JavaScript/Reference/Global_Objects/Object/values +--- +
{{JSRef}}
+ +

Object.values()方法返回一个给定对象自身的所有可枚举属性值的数组，值的顺序与使用{{jsxref("Statements/for...in", "for...in")}}循环的顺序相同 ( 区别在于 for-in 循环枚举原型链中的属性 )。

+ +

语法

+ +
Object.values(obj)
+ +

参数

+ +
+
obj
+
被返回可枚举属性值的对象。
+
+ +

返回值

+ +

一个包含对象自身的所有可枚举属性值的数组。

+ +

描述

+ +

Object.values()返回一个数组，其元素是在对象上找到的可枚举属性值。属性的顺序与通过手动循环对象的属性值所给出的顺序相同。

+ +

示例

+ +
var obj = { foo: 'bar', baz: 42 };
+console.log(Object.values(obj)); // ['bar', 42]
+
+// array like object
+var obj = { 0: 'a', 1: 'b', 2: 'c' };
+console.log(Object.values(obj)); // ['a', 'b', 'c']
+
+// array like object with random key ordering
+// when we use numeric keys, the value returned in a numerical order according to the keys
+var an_obj = { 100: 'a', 2: 'b', 7: 'c' };
+console.log(Object.values(an_obj)); // ['b', 'c', 'a']
+
+// getFoo is property which isn't enumerable
+var my_obj = Object.create({}, { getFoo: { value: function() { return this.foo; } } });
+my_obj.foo = 'bar';
+console.log(Object.values(my_obj)); // ['bar']
+
+// non-object argument will be coerced to an object
+console.log(Object.values('foo')); // ['f', 'o', 'o']
+ +

 

+ +

Polyfill 

+ +

如果要 Object.values兼容不支持它的旧环境，可在 tc39/proposal-object-values-entries 或 es-shims/Object.values 中找到 Polyfill 。

+ +

根据Object.keys()的Polyfill仿写一个：

+ +
if (!Object.values) Object.values = function(obj) {
+    if (obj !== Object(obj))
+        throw new TypeError('Object.values called on a non-object');
+    var val=[],key;
+    for (key in obj) {
+        if (Object.prototype.hasOwnProperty.call(obj,key)) {
+            val.push(obj[key]);
+        }
+    }
+    return val;
+}
+ +

规范

+ + + + + + + + + + + + + + + + + + + +
SpecificationStatusComment
{{SpecName('ESDraft', '#sec-object.values', 'Object.values')}}{{Spec2('ESDraft')}}Initial definition.
{{SpecName('ES8', '#sec-object.values', 'Object.values')}}{{Spec2('ES8')}} 
+ +

浏览器兼容

+ + + +

{{Compat("javascript.builtins.Object.values")}}

+ +

相关链接

+ + -- cgit v1.2.3-54-g00ecf