Aplicación de notas

<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/5.14.0/css/all.min.css" integrity="sha512-1PKOgIY59xJ8Co8+NE6FZ+LOAZKjy+KY8iq0G4B3CyeY6wYHN3yt9PW0XpSriVlkMXe40PTKnXrLnZ9+fkDaog==" crossorigin="anonymous" />
    <link rel="stylesheet" href="style.css" />
    <title>Notes App</title>
  </head>
  <body>
    <button class="add" id="add">
      <i class="fas fa-plus"></i> Add note
    </button>

    <script src="https://cdnjs.cloudflare.com/ajax/libs/marked/1.2.2/marked.min.js"></script>
    <script src="script.js"></script>
  </body>
</html>

@import url('https://fonts.googleapis.com/css2?family=Poppins:wght@200;400&display=swap');

* {
    
    
  box-sizing: border-box;
  outline: none;
}

body {
    
    
  background-color: #7bdaf3;
  font-family: 'Poppins', sans-serif;
  display: flex;
  flex-wrap: wrap;
  margin: 0;
  padding-top: 3rem;
}

.add {
    
    
  position: fixed;
  top: 1rem;
  right: 1rem;
  background-color: #9ec862;
  color: #fff;
  border: none;
  border-radius: 3px;
  padding: 0.5rem 1rem;
  cursor: pointer;
}

.add:active {
    
    
  transform: scale(0.98);
}

.note {
    
    
  background-color: #fff;
  box-shadow: 0 0 10px 4px rgba(0, 0, 0, 0.1);
  margin: 30px 20px;
  height: 400px;
  width: 400px;
  overflow-y: scroll;
}

.note .tools {
    
    
  background-color: #9ec862;
  display: flex;
  justify-content: flex-end;
  padding: 0.5rem;
}

.note .tools button {
    
    
  background-color: transparent;
  border: none;
  color: #fff;
  cursor: pointer;
  font-size: 1rem;
  margin-left: 0.5rem;
}

.note textarea {
    
    
  outline: none;
  font-family: inherit;
  font-size: 1.2rem;
  border: none;
  height: 400px;
  width: 100%;
  padding: 20px;
}

.main {
    
    
  padding: 20px;
}

.hidden {
    
    
  display: none;
}

const addBtn = document.getElementById('add')

// 把之前保存到本地的notes导出
// JSON.parse() 方法用来解析 JSON 字符串，构造由字符串描述的 JavaScript 值或对象
// getItem() 作为 Storage 接口的方法，接受一个键名（key name）作为参数，并返回对应键名的值
const notes = JSON.parse(localStorage.getItem('notes'))

if(notes) {
    
    
    notes.forEach(note => addNewNote(note))
}

addBtn.addEventListener('click', () => addNewNote())

function addNewNote(text = '') {
    
    
    const note = document.createElement('div')
    note.classList.add('note')

    note.innerHTML = `
    <div class="tools">
        <button class="edit"><i class="fas fa-edit"></i></button>
        <button class="delete"><i class="fas fa-trash-alt"></i></button>
    </div>

    <div class="main ${
      
      text ? "" : "hidden"}"></div>
    <textarea class="${
      
      text ? "hidden" : ""}"></textarea>
    `

    const editBtn = note.querySelector('.edit')
    const deleteBtn = note.querySelector('.delete')
    const main = note.querySelector('.main')
    const textArea = note.querySelector('textarea')

    textArea.value = text
    main.innerHTML = marked(text)

    deleteBtn.addEventListener('click', () => {
    
    
        // 从DOM中移除
        note.remove()

        updateLS()
    })

    editBtn.addEventListener('click', () => {
    
    
        main.classList.toggle('hidden')
        textArea.classList.toggle('hidden')
    })

    textArea.addEventListener('input', (e) => {
    
    
        const {
    
     value } = e.target

        main.innerHTML = marked(value)

        updateLS()
    })

    document.body.appendChild(note)
}

// 更新本地存储
function updateLS() {
    
    
    const notesText = document.querySelectorAll('textarea')

    const notes = []

    notesText.forEach(note => notes.push(note.value))

    // 存储到本地
    localStorage.setItem('notes', JSON.stringify(notes))
}

Aplicación de notas

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