String.prototype[@@iterator]()

[@@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。

尝试一下

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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
ECMAScript Language Specification
# sec-string.prototype-@@iterator

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