什么是 var name = (param) => {} 在 JS 中

Question

我正在使用 React-Router 测试存根示例，我以前从未见过这种 class 约定。我猜这是 ES6 特有的？

var stubRouterContext = (Component, props, stubs) => {
    function RouterStub() { }

    Object.assign(RouterStub, {
        makePath () {},
        makeHref () {},
        transitionTo () {},
        replaceWith () {},
        goBack () {},
        getCurrentPath () {},
        getCurrentRoutes () {},
        getCurrentPathname () {},
        getCurrentParams () {},
        getCurrentQuery () {},
        isActive () {},
        getRouteAtDepth() {},
        setRouteComponentAtDepth() {}
    }, stubs);

    return React.createClass({
        childContextTypes: {
            router: React.PropTypes.func,
            routeDepth: React.PropTypes.number
        },

        getChildContext () {
            return {
                router: RouterStub,
                routeDepth: 0
            };
        },

        render () {
            return <Component {...props} />
        }
    });
};

为什么我在执行此操作时会收到 TypeError: object is not function？

var Subject = stubRouterContext(Handler, props);

这是 link 文档 https://github.com/rackt/react-router/blob/master/docs/guides/testing.md

Answer 1

它是 ES6 特定的，它是箭头 shorthand：https://github.com/lukehoban/es6features#arrows

"Arrows are a function shorthand using the => syntax. They are syntactically similar to the related feature in C#, Java 8 and CoffeeScript."

什么是 var name = (param) => {} 在 JS 中

What is var name = (param) => {} in JS

javascript

reactjs

react-router