// 定义一个 Iterator 对象constiterator:Iterator<number>=myArray[Symbol.iterator]();// 逐个输出元素letresult=iterator.next();while(!result.done){console.log(result.value);// 输出 1 2 3 4 5result=iterator.next();} 1. 2. 3. 4. 5
1.parseInt() 2.parseFloat() 3.isNan() 以下是网页表格的HTML代码 [table style="border:1px solid black; font-family:Arial"] [tr] [td]First Number[/td] [td][asp:TextBox ID="txtFirstNumber" runat="server"][/asp:TextBox][/td] [/tr] [tr] [td]Second Number[/td] [td][asp:TextB...
for...of会遍历可迭代的对象(包括 Array,Map,Set,String,TypedArray,arguments 对象等等),调用对象上的Symbol.iterator方法。 4.1 迭代数组 实例演示 let iterable = [10, 20, 30]for (const value of iterable) {console.log(value)}// 10// 20// 30 解释:通过for...of循环遍历数组iterable的每一项元素。
let str: string = 'Hi' let iterator: IterableIterator<string> = str[Symbol.iterator]() console.log(iterator.next()) // { value: 'H', done: false } console.log(iterator.next()) // { value: 'i', done: false } console.log(iterator.next()) // { value: undefined, done: true ...
interface ReadonlyArray<T> { [Symbol.iterator](): IterableIterator<T> entries(): IterableIterator<[number, T]> keys(): IterableIterator<number> values(): IterableIterator<T>} 用法：interface Person { name: string}const personList: ReadonlyArray<Person> = [{ name: 'Jack' }, { ...
{"compilerOptions":{"target":"es2016",// 编译生成的目标版本代码// "lib": ["esnext","dom","dom.iterable","scripthost"], // 指定我们需要用到的库,也可以不配置,直接根据 target 来获取 /* Specify a set of bundled library declaration files that describe the target runtime environment. *...
Building on that work, the new Generator type is an Iterator that always has both the return and throw methods present, and is also iterable. interface Generator<T = unknown, TReturn = any, TNext = unknown> extends Iterator<T, TReturn, TNext> { next(...args: [] | [TNext]): Iterato...
// Symbol.iterator 是 TypeScript 特有语法,预示着当前对象可以使用 for ... of 遍历 [Symbol.iterator](): Iterator<T> { return linkedListIterator(this) } } ![]() 我们使用了生成器在遍历数据结构的过程中会交出值,所以使用它能够简化遍历代码。生成器返回一个 IterableIterator,所以我们可以直接在 for...
An object that supports iteration is said to be “iterable” if it has a Symbol.iterator method that returns an Iterator object.The Iterator protocol also defines the target of some of the ES2015 features like for..of and spread operator and the array rest in destructuring assignmnets....
一个典型等实例是 Iterable,它并不要求像 C++ 一样要求实例必须继承于某个父类或者像 Java 一样要求实例实现某个Interface,它只检查当前的对象是否实现了@@iterator方法。TypeScript 对症下药,接地气地采用了 Structure Type System 来为 JavaScript 量身定制一套灵活的类型系统。