collection<KeyType, ValueType, EntryType, T, ChangeCallbackType>Abstract

此方法与Collection.values方法相同。 它的存在使得collection成为可迭代的，因此能够与 ES6 for-of循环、 ...操作符等一起使用。

看

Symbol.iterator和iterable 协议

例子

for (let object of collection) {
  // do something with each object
}
复制

since

0.11.0

添加监听器callback ，当实时collection实例发生更改时将调用该监听器。

注意

deletions and oldModifications report the indices in the collection before the change happened, while插入and newModifications report the indices into the new version of the collection. @throws A {@link TypeAssertionError} if回调 is not a function. @example wines.addListener((collection, changes) => { // collection === wines console.log( ${changes.insertions.length} 插入); console.log( ${changes.oldModifications.length} oldModifications ); console.log( ${changes.newModifications.length} newModifications ); console.log( ${changes.deletions.length} 删除); console.log(集合的新大小：${collection.length} ); }); @example wines.addListener((collection, changes) => { console.log("A wine's brand might have changed"); }, ["brand"]); @note Adding the listener is an asynchronous operation, so the callback is invoked the first time to notify the caller when the listener has been added. Thus, when the callback is invoked the first time it will contain empty arrays for each property in the 更改` 对象。

看

Array.prototype.keys

since

0.11.0

检查此集合是否未被删除以及是否是有效 Realm 的一部分。

since

0.14.0

看

Array.prototype.keys

since

0.11.0

从collection实例中删除所有callback侦听器。

从collection实例中删除侦听器callback 。

抛出异常

如果callback不是函数，则抛出 TypeAssertionError 。

看

Array.prototype.keys

since

0.11.0