输入
var a = () => {};
var a = (b) => b;
const double = [1,2,3].map((num) => num * 2);
console.log(double); // [2,4,6]
var bob = {
_name: "Bob",
_friends: ["Sally", "Tom"],
printFriends() {
this._friends.forEach(f =>
console.log(this._name + " knows " + f));
}
};
console.log(bob.printFriends());
输出
var a = function () {};
var a = function (b) {
return b;
};
const double = [1, 2, 3].map(function (num) {
return num * 2;
});
console.log(double); // [2,4,6]
var bob = {
_name: "Bob",
_friends: ["Sally", "Tom"],
printFriends() {
var _this = this;
this._friends.forEach(function (f) {
return console.log(_this._name + " knows " + f);
});
}
};
console.log(bob.printFriends());
npm install --save-dev babel-plugin-transform-es2015-arrow-functions
.babelrc（推荐）.babelrc
未包含选项：
{
"plugins": ["transform-es2015-arrow-functions"]
}
包含选项：
{
"plugins": [
["transform-es2015-arrow-functions", { "spec": true }]
]
}
babel --plugins transform-es2015-arrow-functions script.js
require("babel-core").transform("code", {
plugins: ["transform-es2015-arrow-functions"]
});
specboolean，默认为 false。
该选项将生成的函数包装在 .bind(this) 中，并保持使用原函数的 this，而不是使用重命名的 this。它还添加了运行时检查以确保函数是否实例化。