In this example, whensayHello()is called, it executes the arrow function which returns the stringHello, World!. Example 2: Arrow Function With One Argument If a function has only one argument, you can omit the parentheses. For example, constsquare =x=>x * x; // use the arrow function ...
The first example uses a regular function, and the second example uses an arrow function. 第一个示例使用常规函数,第二个示例使用箭头函数。 The result shows that the first example returns two different objects (window and button), and the second example returns the window object twice, because t...
function example(a: number, b: number) { return a + b } 同样arguments 的类型也有强制要求; Arrow Function 也是如此: const example = (a: number, b: number) => ( a + b );
// A button object calls the function: document.getElementById("btn").addEventListener("click", hello); Try it Yourself » Example With an arrow functionthisrepresents theownerof the function: // Arrow Function: hello = () => {
createArrowFunction: function() { return () => { console.log(this.name); console.log(arguments); }; } }; 我们有一个简单的test对象,有两个方法 – 每个方法都返回一个匿名函数。 不同之处在于第一个方法使用传统函数表达式,而后者中使用箭头函数。
c: function() { console.log(this.i, this); } } obj.b(); // prints undefined, Window {...} (or the global object) obj.c(); // prints 10, Object {...} 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. Arrow functions do not have their own this. Another example involving ...
createArrowFunction: function() { return () => { console.log(); console.log(arguments); }; } }; 复制代码 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. 15. 16. 我们有一个有两个方法的对象,每个方法都返回了一个匿名函数。区别在于第一个方法里面用了传统的函数表达式,后面...
Note: Since thearrow function does not have its own this pointer, when called by the call(), apply() and bind() methods, only parameters can be passed, and this cannot be bound, and their first parameter will be ignored. As follows: (The example comes fromMDN) ...
asyncfunctionfetchData(){try{constresponse=awaitfetch('https://api.example.com/data');constdata=awaitresponse.json();returndata;}catch(error){console.error('Error:',error);}} async/await可以帮助您避免回调地狱(callback hell)并使异步代码更具可读性。
Arrow functions do not define ("bind") their own this. Another example involving Object.defineProperty(): 'use strict'; var obj = { a: 10 }; Object.defineProperty(obj, "b", { get: () => { console.log(this.a, typeof this.a, this); return this.a+10; // represents global objec...