代码语言:javascript 代码运行次数:0 运行 AI代码解释 constobj={name:'Alice',sayHi:()=>console.log(`Hello,${this.name}`)// this指向全局对象或undefined(严格模式)};// 应该使用普通函数或显式绑定thissayHi:function(){console.log(`Hello,${this.name}`);} 没有自己的arguments:箭头函数没有自己的a...
由于JavaScript函数对this绑定的错误处理,下面的例子无法得到预期结果: varobj ={ birth:1990, getAge:function() {varb =this.birth;//1990varfn =function() {returnnewDate().getFullYear() -this.birth;//this指向window或undefined};returnfn(); } }; 现在,箭头函数完全修复了this的指向,this总是指向...
let sum = (a, b) => a + b; /* This arrow function is a shorter form of: let sum = function(a, b) { return a + b; }; */ alert( sum(1, 2) ); // 3 上述的例子在中,在等号的右边,箭头函数计算了a+b的值,并返回该值。需要注意的是,这里赋值给sum的是函数本身,而不是函数...
箭头函数（Arrow Functions）- 掌握更简洁的函数定义语法 箭头函数是ES6引入的一种新的函数定义方式，它不仅简化了函数的书写形式，还改变了函数内部this的绑定规则。本文将通过多个实例，详细展示箭头函数如何在JavaScript中提供一种更为简洁和强大的函数定义语法。简洁的语法箭头函数的基本语法如下：(param1, param2, ...
Arrow function箭头函数=> Arrow functions were introduced in ES6. 在ES6中引入了箭头函数。 Arrow functions allow us to write shorter function syntax: 箭头函数允许我们写更短的函数语法: Before: hello = function() { return "Hello World!";
function Foo(){ return {a:1}} var fooInstance = new Foo(1,2) fooInstance instanceof Foo //false,注意不是true,fooInstance不是Foo的实例 Object.create(Foo.prototype) instanceof Foo //true //只要Foo.prototype存在且是对象,那么Object.create(Foo.prototype)永远是Foo的一个实例 ...
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...
JavaScript arrow functions are a concise syntax for writingfunction expressions. Here's a quick example of the arrow function. You can read the rest of the tutorial for more. Example // an arrow function to add two numbersconstaddNumbers =(a, b) =>a + b;// call the function with two...
sayHi: function() { console.log(`Hello, ${}`); } 1. 2. 3. 4. 5. 6. 没有自己的arguments:箭头函数没有自己的arguments对象,使用剩余参数(...args)替代。 const add = (...args) => args.reduce((acc, val) => acc + val, 0); ...
Arrow Function With Parameters: hello = (val) =>"Hello "+ val; Try it Yourself » In fact, if you have only one parameter, you can skip the parentheses as well: Arrow Function Without Parentheses: hello = val =>"Hello "+ val; ...