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/array/tolocalestring/index.html | 177 +++++++++++++++++++++ 1 file changed, 177 insertions(+) create mode 100644 files/zh-cn/web/javascript/reference/global_objects/array/tolocalestring/index.html (limited to 'files/zh-cn/web/javascript/reference/global_objects/array/tolocalestring') diff --git a/files/zh-cn/web/javascript/reference/global_objects/array/tolocalestring/index.html b/files/zh-cn/web/javascript/reference/global_objects/array/tolocalestring/index.html new file mode 100644 index 0000000000..38b9c01c94 --- /dev/null +++ b/files/zh-cn/web/javascript/reference/global_objects/array/tolocalestring/index.html @@ -0,0 +1,177 @@ +--- +title: Array.prototype.toLocaleString() +slug: Web/JavaScript/Reference/Global_Objects/Array/toLocaleString +tags: + - Array + - JavaScript + - Method +translation_of: Web/JavaScript/Reference/Global_Objects/Array/toLocaleString +--- +
{{JSRef("Global_Objects", "Array")}}
+ +

toLocaleString() 返回一个字符串表示数组中的元素。数组中的元素将使用各自的 toLocaleString 方法转成字符串，这些字符串将使用一个特定语言环境的字符串（例如一个逗号 ","）隔开。

+ +
{{EmbedInteractiveExample("pages/js/array-tolocalestring.html")}}
+ +

语法

+ +
arr.toLocaleString([locales[,options]]);
+ +

参数

+ +
+
locales {{optional_inline}}
+
带有BCP 47语言标记的字符串或字符串数组，关于locales参数的形式与解释，请看{{jsxref("Intl")}}页面。
+
options {{optional_inline}}
+
一个可配置属性的对象，对于数字 {{jsxref("Number.prototype.toLocaleString()")}}，对于日期{{jsxref("Date.prototype.toLocaleString()")}}.
+
+ +

返回值

+ +

表示数组元素的字符串。

+ +

示例

+ +

使用locales和options

+ +

数组中的元素将会使用各自的 toLocaleString 方法：

+ + + +

总是在prices数组中显示字符串和数字的货币符号：

+ +
var prices = ['￥7', 500, 8123, 12];
+prices.toLocaleString('ja-JP', { style: 'currency', currency: 'JPY' });
+
+// "￥7,￥500,￥8,123,￥12"
+ +

更多实例请看 {{jsxref("Intl")}}，{{jsxref("NumberFormat")}}和{{jsxref("DateTimeFormat")}}页面。

+ +

Polyfill

+ +
// https://tc39.github.io/ecma402/#sup-array.prototype.tolocalestring
+if (!Array.prototype.toLocaleString) {
+  Object.defineProperty(Array.prototype, 'toLocaleString', {
+    value: function(locales, options) {
+      // 1. Let O be ? ToObject(this value).
+      if (this == null) {
+        throw new TypeError('"this" is null or not defined');
+      }
+
+      var a = Object(this);
+
+      // 2. Let len be ? ToLength(? Get(A, "length")).
+      var len = a.length >>> 0;
+
+      // 3. Let separator be the String value for the
+      //    list-separator String appropriate for the
+      //    host environment's current locale (this is
+      //    derived in an implementation-defined way).
+      // NOTE: In this case, we will use a comma
+      var separator = ',';
+
+      // 4. If len is zero, return the empty String.
+      if (len === 0) {
+        return '';
+      }
+
+      // 5. Let firstElement be ? Get(A, "0").
+      var firstElement = a[0];
+      // 6. If firstElement is undefined or null, then
+      //  a.Let R be the empty String.
+      // 7. Else,
+      //  a. Let R be ?
+      //     ToString(?
+      //       Invoke(
+      //        firstElement,
+      //        "toLocaleString",
+      //        « locales, options »
+      //       )
+      //     )
+      var r = firstElement == null ?
+        '' : firstElement.toLocaleString(locales, options);
+
+      // 8. Let k be 1.
+      var k = 1;
+
+      // 9. Repeat, while k < len
+      while (k < len) {
+        // a. Let S be a String value produced by
+        //   concatenating R and separator.
+        var s = r + separator;
+
+        // b. Let nextElement be ? Get(A, ToString(k)).
+        var nextElement = a[k];
+
+        // c. If nextElement is undefined or null, then
+        //   i. Let R be the empty String.
+        // d. Else,
+        //   i. Let R be ?
+        //     ToString(?
+        //       Invoke(
+        //        nextElement,
+        //        "toLocaleString",
+        //        « locales, options »
+        //       )
+        //     )
+        r = nextElement == null ?
+          '' : nextElement.toLocaleString(locales, options);
+
+        // e. Let R be a String value produced by
+        //   concatenating S and R.
+        r = s + r;
+
+        // f. Increase k by 1.
+        k++;
+      }
+
+      // 10. Return R.
+      return r;
+    }
+  });
+}
+
+ +

如果你需要支持真正不支持Object.defineProperty的JavaScript引擎，最好不要对Array.prototype方法进行填充，因为你不能使它们不可枚举。

+ +

规范

+ + + + + + + + + + + + + + + + + + + +
SpecificationStatusComment
{{SpecName('ESDraft', '#sec-array.prototype.tolocalestring', 'Array.prototype.toLocaleString')}}{{Spec2('ESDraft')}}Initial definition was in ECMAScript 3.
{{SpecName('ES Int Draft', '#sup-array.prototype.tolocalestring', 'Array.prototype.toLocaleString')}}{{Spec2('ES Int Draft')}}This definition supersedes the definition provided in ECMA-262.
+ +

浏览器兼容性

+ + + +

{{Compat("javascript.builtins.Array.toLocaleString")}}

+ +

参见

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