利用Cloudflare Workers KV搭建一个简单的Todo List App

最新推荐文章于 2025-04-16 18:00:00 发布

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本文详细介绍了如何利用Cloudflare Workers KV构建一个根据用户IP地址显示定制TodoList的应用，包括代码实现、步骤和配置过程。通过KV存储，每个用户的待办事项列表独立且实时更新。

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利用Cloudflare Workers KV搭建一个简单的Todo List App，可根据IP地址显示Todo List 。

效果演示

Workers KV Todo List App

搭建步骤

注册或登陆 Cloudflare，新建一个Workers，将以下代码copy到如图所示位置，替换原有代码。

const html = todos => `
<!DOCTYPE html>
<html>
  <head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width,initial-scale=1">
    <title>Todos</title>
    <link href="https://cdn.jsdelivr.net/npm/tailwindcss/dist/tailwind.min.css" rel="stylesheet"></link>
  </head>
  <body class="bg-blue-100">
    <div class="w-full h-full flex content-center justify-center mt-8">
      <div class="bg-white shadow-md rounded px-8 pt-6 py-8 mb-4">
        <h1 class="block text-grey-800 text-md font-bold mb-2">Todos</h1>
        <div class="flex">
          <input class="shadow appearance-none border rounded w-full py-2 px-3 text-grey-800 leading-tight focus:outline-none focus:shadow-outline" type="text" name="name" placeholder="A new todo"></input>
          <button class="bg-blue-500 hover:bg-blue-800 text-white font-bold ml-2 py-2 px-4 rounded focus:outline-none focus:shadow-outline" id="create" type="submit">Create</button>
        </div>
        <div class="mt-4" id="todos"></div>
      </div>
    </div>
  </body>
  <script>
    window.todos = ${todos}
    var updateTodos = function() {
      fetch("/", { method: 'PUT', body: JSON.stringify({ todos: window.todos }) })
      populateTodos()
    }
    var completeTodo = function(evt) {
      var checkbox = evt.target
      var todoElement = checkbox.parentNode
      var newTodoSet = [].concat(window.todos)
      var todo = newTodoSet.find(t => t.id == todoElement.dataset.todo)
      todo.completed = !todo.completed
      window.todos = newTodoSet
      updateTodos()
    }
    var populateTodos = function() {
      var todoContainer = document.querySelector("#todos")
      todoContainer.innerHTML = null
      window.todos.forEach(todo => {
        var el = document.createElement("div")
        el.className = "border-t py-4"
        el.dataset.todo = todo.id
        var name = document.createElement("span")
        name.className = todo.completed ? "line-through" : ""
        name.textContent = todo.name
        var checkbox = document.createElement("input")
        checkbox.className = "mx-4"
        checkbox.type = "checkbox"
        checkbox.checked = todo.completed ? 1 : 0
        checkbox.addEventListener('click', completeTodo)
        el.appendChild(checkbox)
        el.appendChild(name)
        todoContainer.appendChild(el)
      })
    }
    populateTodos()
    var createTodo = function() {
      var input = document.querySelector("input[name=name]")
      if (input.value.length) {
        window.todos = [].concat(todos, { id: window.todos.length + 1, name: input.value, completed: false })
        input.value = ""
        updateTodos()
      }
    }
    document.querySelector("#create").addEventListener('click', createTodo)
  </script>
</html>
`

const defaultData = { todos: [] }

const setCache = (key, data) => TODOS.put(key, data)
const getCache = key => TODOS.get(key)

async function getTodos(request) {
  const ip = request.headers.get('CF-Connecting-IP')
  const cacheKey = `data-${ip}`
  let data
  const cache = await getCache(cacheKey)
  if (!cache) {
    await setCache(cacheKey, JSON.stringify(defaultData))
    data = defaultData
  } else {
    data = JSON.parse(cache)
  }
  const body = html(JSON.stringify(data.todos || []).replace(/</g, "\\u003c"))
  return new Response(body, {
    headers: { 'Content-Type': 'text/html' },
  })
}

async function updateTodos(request) {
  const body = await request.text()
  const ip = request.headers.get('CF-Connecting-IP')
  const cacheKey = `data-${ip}`
  try {
    JSON.parse(body)
    await setCache(cacheKey, body)
    return new Response(body, { status: 200 })
  } catch (err) {
    return new Response(err, { status: 500 })
  }
}

async function handleRequest(request) {
  if (request.method === 'PUT') {
    return updateTodos(request)
  } else {
    return getTodos(request)
  }
}

addEventListener('fetch', event => {
  event.respondWith(handleRequest(event.request))
})