箭头函数在ES6类中没有绑定“this”吗? [英] Do arrow functions not bind `this` inside ES6 classes?
本文介绍了箭头函数在ES6类中没有绑定“this”吗?的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
iojs
2.3.0与 - harmony_arrow_functions
标志。) class Foo {
constructor(){this.foo =foo; }
sayHi(){return(()=> this.foo)(); }
}
f = new Foo();
f.sayHi //无法读取未定义的属性foo。
我希望箭头函数可以为选择正确的值
。我错过了什么吗?
解决方案
我不知道问题,但是我的版本对我来说很好:
class Foo {
constructor(){
this.foo =foo;
}
sayHi(){
return(()=> console.log(this.foo))();
}
}
const f = new Foo();
f.sayHi();
BTW:我正在使用 babel
p>
I'm surprised this doesn't work. (I'm running iojs
2.3.0 with the --harmony_arrow_functions
flag.)
class Foo {
constructor() { this.foo = "foo"; }
sayHi() { return (() => this.foo)(); }
}
f = new Foo();
f.sayHi // Cannot read property 'foo' of undefined.
I would have expected the arrow function to pick up the right value for this
. Am I missing something?
解决方案
I don't know the problem, but my version works fine for me:
class Foo {
constructor() {
this.foo = "foo";
}
sayHi() {
return (() => console.log(this.foo))();
}
}
const f = new Foo();
f.sayHi();
BTW: I am using babel
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