String.prototype[@@iterator]() - JavaScript 编辑

[@@iterator]() 方法返回一个新的Iterator对象，它遍历字符串的代码点，返回每一个代码点的字符串值。

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语法

string[Symbol.iterator]

返回值

一个新的Iterator对象。

示例

使用[@@iterator]()

var string = 'A\uD835\uDC68';

var strIter = string[Symbol.iterator]();

console.log(strIter.next().value); // "A"
console.log(strIter.next().value); // "\uD835\uDC68"

通过 for..of 使用[@@iterator]()

var string = 'A\uD835\uDC68B\uD835\uDC69C\uD835\uDC6A';

for (var v of string) {
  console.log(v);
}
// "A"
// "\uD835\uDC68"
// "B"
// "\uD835\uDC69"
// "C"
// "\uD835\uDC6A"

规范

Specification	Status	Comment
ECMAScript 2015 (6th Edition, ECMA-262) String.prototype[@@iterator]()	Standard	Initial definition.
ECMAScript Latest Draft (ECMA-262) String.prototype[@@iterator]()	Draft

浏览器兼容性

We're converting our compatibility data into a machine-readable JSON format. This compatibility table still uses the old format, because we haven't yet converted the data it contains. Find out how you can help!

• Desktop
• Mobile

Feature	Chrome	Firefox (Gecko)	Internet Explorer	Opera	Safari
基本支持	(Yes)	36 (36) [1]	未实现	未实现	未实现

Feature	Android	Chrome for Android	Firefox Mobile (Gecko)	IE Mobile	Opera Mobile	Safari Mobile
基本支持	未实现	(Yes)	36.0 (36) [1]	未实现	未实现	未实现

[1] From Gecko 17 (Firefox 17 / Thunderbird 17 / SeaMonkey 2.14) to Gecko 26 (Firefox 26 / Thunderbird 26 / SeaMonkey 2.23 / Firefox OS 1.2) the iterator property was used (bug 907077), and from Gecko 27 to Gecko 35 the "@@iterator" placeholder was used. In Gecko 36 (Firefox 36 / Thunderbird 36 / SeaMonkey 2.33), the @@iterator symbol got implemented (bug 918828).

相关链接

• Iteration protocols