迭代 Map 是可迭代对象,所以它可以直接迭代。 Object 没有实现迭代协议,因此对象默认情况下不能直接通过 JavaScript 的 for...of 语句进行迭代。 备注: 一个对象可以实现迭代协议,或者你可以使用 Object.keys 或Object.entries 来获取一个对象的可迭代对象。 for...in 语句允许你迭代对象的可枚举属性。 性...
Code Issues Pull requests MDN polyfills - from, forEach, filter, find, findIndex, assign, includes, create, entries, of, repeat, startsWith, endsWith, toggleAttribute, bind, MouseEvent, CustomEvent, padEnd, padStart mdn polyfills Updated Dec 7, 2022 JavaScript cpm...
Set.prototype.entries() 返回一个新的迭代器对象,该对象包含 Set 对象中的代表每个元素的 [value, value] 数组。这与 Map 对象类似,因此 Set 的每个条目的 key 和value 都相同。 Set.prototype.forEach() 按照值插入的顺序为 Set 对象中的每个值调用一次 callbackFn。如果提供了 thisArg 参数,它将被用作每...
new Map()构造函数接受一个包含键值对元素的可迭代数组。 借助Object.entries方法你可以很容易的将Object转换为Map: var obj = { foo: "bar", baz: 42 }; var map = new Map(Object.entries(obj)); console.log(map); // Map { foo: "bar", baz: 42 } ...
Map.prototype[@@toStringTag] [我来译!] get Map[@@species] [我来译!] 方法 Map.prototype.clear() Map.prototype.delete() Map.prototype.entries() Map.prototype.forEach() Map.prototype.get() Map.prototype.has() Map.prototype.keys() Map.prototype.set() [我来译!] Map.prototype.values() ...
Firefox Opera Safari Chrome Android Firefox for Android Opera Android Safari on iOS Samsung Internet WebView Android WebView on iOS Deno Node.js filter Legend Tip: you can click/tap on a cell for more information. Full support Full support...
webkitEntries Read only Describes the currently selected files or directories.Instance properties that apply only to visible elements containing text or numbers autocomplete A string that represents the element's autocomplete attribute, indicating whether the value of the control can be automatically complet...
WarningDeprecated General warning information about possible problems. Contributing You can help bywriting new entriesor improving the existing ones. See also Wikipedia page on List of HTTP headers IANA registry HTTP Working Group
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var ary2=ary.entries(); console.log(ary); console.log(ary2);//Array Iterator返回一个数组迭代器 ,这个迭代器的原型上有next方法 console.log(ary2.next());//Object {value: Array[2], done: false} value:Array[2] ---[0:0,1:1]; console...