ArrowFunction ArrowFunction(箭头函数)是ES6新增的一种新语法,主要是用来简化function的写法,更准确的说是简化匿名函数表达式的一种写法。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[...
0 'this' in arrow function not showing lexical scoping 0 I am confused with the 'this' keyword in arrow function for this case 2 ES6 Arrow functions vs ES5: how to know which function to bind `this` to when using ES5 non-arrow function 9 JavaScript "this" keyword and arrow func...
JavaScript学习笔记(十二)——箭头函数(Arrow Function) 在学习廖雪峰前辈的JavaScript教程中,遇到了一些需要注意的点,因此作为学习笔记列出来,提醒自己注意! 如果大家有需要,欢迎访问前辈的博客https://www.liaoxuefeng.com/学习。 ES6标准新增了一种新的函数:Arrow Function(箭头函数)。 更简洁的语法 我们先来按常规...
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...
letsum=(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,而不是函数计算后的值,换句话说,这里sum...
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
所以我们一般不建议对象中定义函数的时候使用Arrow Function,毕竟this就会造成错误了。所以应该这么写 varobj={ field:'hello', getField(){console.log(this.field) } } 或者: obj={ field:'hello', getField:function() { var fn ()=>{console.log(this.field)}; ...
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. ...
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...
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...