因此匿名函数表达式的规则也适用于ArrowFunction,不过两者还是有区别的,ArrowFunction中没有规定不能直接出现super,也就是说在ArrowFunction中可以用super方法,其次ArrowFunction内部没有[[Construct]]方法,因此不能作为构造器调用,所以在创建Function对象时不执行makeConstructor方法。最重要一点就是ArrowFunction没有本地的this...
查了下此时arrow function中的this是global context,虽然知道这规则就是es6这样规定的,但是好奇心仍然得不到满足,今日偶然在知乎看见一个回答提到了更多信息。 原题是探讨关于this的缺陷的,其中 贺师俊 的回答提到: 1. JavaScript的this在直接调用时会是global,这是不是个错误? 答:是设计错误。所以ES5的strict模式改...
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...
Before Arrow: 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 brackets...
JS arrow function An arrow function is an anonymous function with a shorter syntax. It is defined with a pair of parenthesis that contains a list of parameters, followed by a fat arrow (=>) and a pair of curly braces{}that delimits the body statements. ...
Note:Arrow functions were introduced in ES6. Some browsers may not support the use of arrow functions. VisitJavaScript Arrow Function supportto learn more. Regular Function vs. Arrow Function To see the difference between a regular function expression and an arrow function, let's consider a funct...
Arrow functions (Function) – JavaScript 中文开发手册,[Arrowfunctions(Function)-JavaScript中文开发手册箭头函数表达式的语法比函数表达式更短,并且不绑定自己的this,arguments,super或 new.target。这些函数表达式最适合用于非方法函数,并且它们不能用作构造函数
If you use a this inside an arrow function, it behaves exactly as any other variable reference, which is that the scope chain is consulted to find a function scope (non-arrow function) where it is defined, and to use that one. 翻译:如果在箭头函数中使用this,则它的行为与任何其他变量引用...
面向对象的JavaScript-008-Function介绍 1 // 函数 2 /* Declare the function 'myFunc' */ 3 function myFunc(theObject) { 4 theObject.brand = "Toyota"; 5 } 6 7 /* 8 * Declare variable 'mycar'; 9 * create and initialize a new Object;...
JavaScript Arrow Function JavaScript Constructor Function JavaScript Closures JavaScript Function and Function Expressions A function is an independent block of code that performs a specific task, while a function expression is a way to store functions in variables. Here's a quick example of functi...