我们使用带有打字稿的普通 vite 项目来理解打字稿，并使用本地存储来存储待办事项。
<!doctype html>
<html lang="en">
<head>
<meta charset="utf-8" />
<link rel="icon" type="image/svg+xml" href="/vite.svg" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<title>vite + ts</title>
<link rel="stylesheet" href="./src/style.css">
</head>
<body>
<div id="app">
<div class="container">
<h1>my todo list</h1>
<form id="myform">
<input required type="text" id="inputtodo" placeholder="enter todo">
<button type="submit" id="btnsubmit">add</button>
</form>
<div class="todos-container">
<!-- <div class="todo-item">
<input id="iscomplete" type="checkbox">
<p id="todotext">my today todo</p>
<button id="btndelete">x</button>
</div> -->
</div>
</div>
</div>
<script type="module" src="/src/main.ts"></script>
</body>
</html>
.container{
max-width: 700px;
margin-inline: auto;
display: flex;
align-items: center;
justify-content: center;
flex-direction: column;
}
form #inputtodo{
padding: 8px 15px;
}
form #btnsubmit{
padding: 8px 15px;
}
.todos-container{
padding: 10px;
width: 100%;
width: fit-content;
}
.todo-item{
padding: 5px;
border: 1px solid gray;
gap: 20px;
width: 100%;
display: flex;
align-items: center;
}
.textcut{
text-decoration: line-through;
}
interface Todo{
content: string,
isComplete: boolean,
readonly id:string
}
let todos:Todo[] = [];
const todosContainer = document.querySelector('.todos-container')!;
function genrateTodo(id: string, content:string, isComplete:boolean){
const itemContainer:HTMLDivElement = document.createElement('div');
itemContainer.classList.add('todo-item');
// checkbox
const checkbox: HTMLInputElement = document.createElement('input');
checkbox.type = "checkbox";
checkbox.checked = isComplete
checkbox.onchange = () => {
todos.find(todo => {
if(todo.id === id) todo.isComplete = checkbox.checked;
// save updated todo
localStorage.setItem('todos', JSON.stringify(todos));
})
todoText.className = checkbox.checked ? 'textCut' : '';
}
// paragraph content
const todoText:HTMLParagraphElement = document.createElement('p');
todoText.innerHTML = content;
todoText.className = isComplete ? 'textCut' : '';
// delete button
const btnDelete: HTMLButtonElement = document.createElement('button');
btnDelete.textContent = 'X';
btnDelete.onclick = () => {
todos = todos.filter(todo => todo.id !== id);
localStorage.setItem('todos', JSON.stringify(todos));
renderTodos(todos);
}
itemContainer.append(checkbox, todoText, btnDelete);
todosContainer.appendChild(itemContainer);
}
// add todo
const form = document.getElementById('myForm')!;
form.onsubmit = (e: SubmitEvent) => {
e.preventDefault();
const inputElement = document.getElementById('inputTodo') as HTMLInputElement;
let value:string = inputElement.value;
const newTodo:Todo = {
id: String(Math.random() * 1000),
content: value,
isComplete: false
}
todos.push(newTodo);
inputElement.value = "";
localStorage.setItem('todos', JSON.stringify(todos));
renderTodos(todos);
}
function renderTodos(todos: Todo[]){
todosContainer.innerHTML = "";
todos.forEach(todo => {
genrateTodo(todo.id, todo.content, todo.isComplete);
})
}
const jsonTodos = localStorage.getItem('todos')!;
const storedTodos : Todo[] = JSON.parse(jsonTodos);
todos = storedTodos;
renderTodos(todos);
