Array.prototype[@@iterator]()

@@iterator属性和 values() 属性的初始值均为同一个函数对象

语法

arr[Symbol.iterator]()

返回值

数组的 iterator 方法，默认情况下与 values() 返回值相同

示例

使用 for...of 循环进行迭代

var arr = ['w', 'y', 'k', 'o', 'p'];
// 您的浏览器必须支持for...of循环
// 以及let —— 将变量作用域限定在 for 循环中
for (let letter of arr) {
  console.log(letter);
}

另一种迭代方式

var arr = ['w', 'y', 'k', 'o', 'p'];
var eArr = arr[Symbol.iterator]();
console.log(eArr.next().value); // w
console.log(eArr.next().value); // y
console.log(eArr.next().value); // k
console.log(eArr.next().value); // o
console.log(eArr.next().value); // p

规范

浏览器兼容性

[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

• Array.prototype.keys()
• Array.prototype.entries()
• Array.prototype.forEach()
• Array.prototype.every()
• Array.prototype.some()
• Array.prototype.values()