With Arrow Function: hello = () => { return "Hello World!"; } It gets shorter! 它变得更短了! If the function has only one statement, and the statement returns a value, you can remove the brackets and thereturnkeyword: 如果函数只有一个语句,而语句返回一个值,你可以删除括号和return关键字...
// call the arrow function and print its return valueconsole.log(sayHello());// Output: Hello, World! Run Code 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 on...
hello =function() { return"Hello World!"; } Try it Yourself » With Arrow Function: hello = () => { return"Hello World!"; } Try it Yourself » It gets shorter! If the function has only one statement, and the statement returns a value, you can remove the bracketsandthereturnkeyw...
No matter where it is executed or where it is executed, the value of this inside the arrow function is always equal to the value of the outer function, that is, the arrow function does not change the direction of this. const obj = { fnc(arr) { console.log(this); // obj const cb...
eslint: prefer-arrow-callback, arrow-spacing jscs: requireArrowFunctions 它创建了一个在 this 上下文中执行的函数的版本,这通常是你想要的,而且这样的写法更为简洁。 代码语言:javascript 代码运行次数:0 运行 AI代码解释 // bad [1, 2, 3].map(function (x) { const y = x + 1; return x * y...
{seriesName}is the best`// outputs: "Bridgerton is the best"console.log(bestNetflixSeries())// no parentheses: errorconstbestNetflixSeries=seriesName="Bridgerton"=>`${seriesName}is the best`// Uncaught SyntaxError: invalid arrow-function arguments (parentheses around the arrow-function may ...
箭頭函數表示式 (Arrow function expression,也是所謂的 fat arrow function) 比起一般的函數表示式擁有更短的語法以及詞彙上綁定 this 變數,所有的箭頭函數都是無名函數 (anonymous function). 基本語法 (param1, param2,…, paramN) => { statements } (param1, param2,…, paramN) => expression // 等...
const arrowFun = (num1, num2) => { num1 + num2 }; 这里,您像以前一样创建一个常量变量。你丢掉了function关键字,使用了有时被称为的粗箭头 : = >。花括号仍然存在。您可能还注意到您删除了关键字return。当使用箭头函数时,如果函数体只有一行,JavaScript 将使用所谓的隐式返回。这只是箭头函数与您...
// Uncaught SyntaxError: invalid arrow-function arguments (parentheses around the arrow-function may help) 仅仅因为你可以,并不意味着你应该。Kyle Simpson(以You Don't Know JS成名)夹杂着一点轻松、善意的讽刺,将他对省略括号的想法写进了这个流程图。
// Uncaught SyntaxError: invalid arrow-function arguments (parentheses around the arrow-function may ...