JS代码优化

持续更新中.......

1. 变量命名符合实际含义且明了

Bad:

const yyyymmdstr = moment().format("YYYY/MM/DD");

const locations = ["Austin", "New York", "San Francisco"];
locations.forEach(l => {
  doStuff();
  doSomeOtherStuff();
  // ...
  // ...
  // ...
  // Wait, what is `l` for again?
  dispatch(l);
});

Good:

const currentDate = moment().format("YYYY/MM/DD");

const locations = ["Austin", "New York", "San Francisco"];
locations.forEach(location => {
  doStuff();
  doSomeOtherStuff();
  // ...
  // ...
  // ...
  dispatch(location);
});

2. 相同变量类型使用相同的词汇才进行命名

Bad:

getUserInfo();
getClientData();
getCustomerRecord();

Good:

getUser();

3. 对常量表达式进行声明

Bad:

setTimeout(blastOff, 86400000);

Good:

const MILLISECONDS_PER_DAY = 60 * 60 * 24 * 1000; //86400000;

setTimeout(blastOff, MILLISECONDS_PER_DAY);

4. 使用解释性的变量

Bad:

const address = "One Infinite Loop, Cupertino 95014";
const cityZipCodeRegex = /^[^,\\]+[,\\\s]+(.+?)\s*(\d{5})?$/;
saveCityZipCode(
  address.match(cityZipCodeRegex)[1],
  address.match(cityZipCodeRegex)[2]
);

Good:

const address = "One Infinite Loop, Cupertino 95014";
const cityZipCodeRegex = /^[^,\\]+[,\\\s]+(.+?)\s*(\d{5})?$/;
const [_, city, zipCode] = address.match(cityZipCodeRegex) || [];
saveCityZipCode(city, zipCode);

5.不要重复含义命名

Bad:

const Car = {
  carMake: "Honda",
  carModel: "Accord",
  carColor: "Blue"
};

function paintCar(car, color) {
  car.carColor = color;
}

Good:

const Car = {
  make: "Honda",
  model: "Accord",
  color: "Blue"
};

function paintCar(car, color) {
  car.color = color;
}

6. 参数使用默认值，而不要使用短路表达式或条件

Bad:

function createMicrobrewery(name) {
  const breweryName = name || "Hipster Brew Co.";
  // ...
}

Good:

function createMicrobrewery(name = "Hipster Brew Co.") {
  // ...
}

7.函数参数最多不应超过3个，理想状态是1到2个，若超过可使用对象解构写法实现

Bad:

function createMenu(title, body, buttonText, cancellable) {
  // ...
}

createMenu("Foo", "Bar", "Baz", true);

Good:

function createMenu({ title, body, buttonText, cancellable }) {
  // ...
}

createMenu({
  title: "Foo",
  body: "Bar",
  buttonText: "Baz",
  cancellable: true
});

8.一个函数应该只有功能，方便重构

Bad:

function emailClients(clients) {
  clients.forEach(client => {
    const clientRecord = database.lookup(client);
    if (clientRecord.isActive()) {
      email(client);
    }
  });
}

Good:

function emailActiveClients(clients) {
  clients.filter(isActiveClient).forEach(email);
}

function isActiveClient(client) {
  const clientRecord = database.lookup(client);
  return clientRecord.isActive();
}