The initial value of the @@iterator property is the same function object as the initial value of the values property.
语法
mySet[Symbol.iterator]返回值
The Set iterator function, which is the values() function by default.
示例
Using [@@iterator]()
var mySet = new Set();
mySet.add("0");
mySet.add(1);
mySet.add({});
var setIter = mySet[Symbol.iterator]();
console.log(setIter.next().value); // "0"
console.log(setIter.next().value); // 1
console.log(setIter.next().value); // Object
Using [@@iterator]() with for..of
var mySet = new Set();
mySet.add("0");
mySet.add(1);
mySet.add({});
for (var v of mySet) {
console.log(v);
}
规范
| 规范 | 状态 | 说明 |
|---|---|---|
| ECMAScript 2015 (6th Edition, ECMA-262) Set.prototype[@@iterator] |
Standard | Initial definition. |
| ECMAScript Latest Draft (ECMA-262) Set.prototype[@@iterator] |
Draft |
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!
| Feature | Chrome | Firefox (Gecko) | Internet Explorer | Opera | Safari |
|---|---|---|---|---|---|
| Basic support | (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 |
|---|---|---|---|---|---|---|
| Basic support | (Yes) | (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).