学习ide功能

ctrl p

let favoriteAnimals = ['dog', 'cat', 'unicorn'];
function pickAnimal(arr) {
    const rnd = arr.length * Math.random();
    return arr[Math.floor()];
}
console.log();

光标放()中，按ctrl p

ctrl q

选中floor，按一下ctrl q

选中floor，按两下ctrl p

Code Inspections

function listBookAuthors(books) {
    let listOfAuthors = [];
    books.forEach(function () {
        if (!listOfAuthors.includes(book.author)) {
            listOfAuthors.push(book.author);
        }
    });
    return listOfAuthors;
}
let myBooks = [
    {title: 'Harry Potter', author: 'J. K. Rowling'},
    {title: 'Lord of the Rings', author: 'J. R. R. Tolkien'},
    {title: 'The Hobbit', author: 'J. R. R. Tolkien'}
];
listBookAuthors(myBooks);

f2

选中高亮的book，book下面有波浪线
选中第4行高亮的book，按f2，跳转到下一个book，并显示信息

选中book按alt+enter

创建形参

选中function，有图标

选中function，按alt enter

转为箭头函数

Refactoring your code

function listBookAuthors(books) {
    let listOfAuthors = [];
    books.forEach(book => {
        if (!listOfAuthors.includes(book.author)) {
            listOfAuthors.push(book.author);
        }
    });
    return listOfAuthors;
}
let myBooks = [
    {title: 'Harry Potter', author: 'J. K. Rowling'},
    {title: 'Lord of the Rings', author: 'J. R. R. Tolkien'},
    {title: 'The Hobbit', author: 'J. R. R. Tolkien'}
];
listBookAuthors(myBooks);

选中books，按ctrl alt shift t

一次重命名

重命名第二次

选中author，引入变量

选中book.author,替换全部2个匹配项

替换两个

格式化

ctrl+alt+L

        <!doctype html><html lang="en">
<head>
  <meta charset="UTF-8">
  <title>Multiple selections</title>
</head>
<body>
<table>
  <tr>
      <td>Jackson</td>
     <td>Eve</td>
    <td>24</td>
  </tr>
  <tr>
    <td>First name</td>
    <td>Last name</td>
    <td>Age</td>
  </tr>
</table>
</body>
  </html>

ctrl+w选中标签
ctrl+shift+w取消选中

ctrl+/

ctrl+shift+/

ctrl+shift+向上
移动整个标签

选中td，按alt+j，选中标签

alt+j多行选中模式

ctrl+D复制所选行
ctrl+Y删除整行
ctrl+/ 注释一行

import {Pet} from './pet';
export class Dog extends Pet {
    constructor(name, ownerName, breed) {
        super(name, ownerName);
        this.breed = breed;
    }
    giveTreat(favoriteTreat) {
        console.log(`${this.ownerName} gives ${this.name} ${favoriteTreat}`)
    }
}
let snoopy = new Dog('Snoopy', 'Charlie', 'Beagle');
snoopy.giveTreat('pizza');