ToDoList：使用HTML, CSS和JavaScript实现本地存储功能-优快云博客

本文链接：https://blog.youkuaiyun.com/qq_41435977/article/details/133030453

1.html

<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>ToDoList-最简单的待办事项列表</title>
    <link rel="stylesheet" href="css/index.css">
    <script src="js/jquery.min.js"></script>
    <script src="js/tudolist.js"></script>
</head>

<body>
    <header>
        <section>
            <label for="title">ToDoList</label>
            <input type="text" id="title" name="title" placeholder="添加ToDo" required="required" autocomplete="off" />
        </section>
    </header>
    <section>
        <h2>正在进行 <span id="todocount"></span></h2>
        <ol id="todolist" class="demo-box">

        </ol>
        <h2>已经完成 <span id="donecount"></span></h2>
        <ul id="donelist">

        </ul>
    </section>
    <footer>
        Copyright &copy; 2021 todolist.cn
    </footer>
</body>

</html>

2.css

body {
    margin: 0;
    padding: 0;
    font-size: 16px;
    background: #CDCDCD;
}

header {
    height: 50px;
    background: #333;
    background: rgba(47, 47, 47, 0.98);
}

section {
    margin: 0 auto;
}

label {
    float: left;
    width: 100px;
    line-height: 50px;
    color: #DDD;
    font-size: 24px;
    cursor: pointer;
    font-family: "Helvetica Neue", Helvetica, Arial, sans-serif;
}

header input {
    float: right;
    width: 60%;
    height: 24px;
    margin-top: 12px;
    text-indent: 10px;
    border-radius: 5px;
    box-shadow: 0 1px 0 rgba(255, 255, 255, 0.24), 0 1px 6px rgba(0, 0, 0, 0.45) inset;
    border: none
}

input:focus {
    outline-width: 0
}

h2 {
    position: relative;
}

span {
    position: absolute;
    top: 2px;
    right: 5px;
    display: inline-block;
    padding: 0 5px;
    height: 20px;
    border-radius: 20px;
    background: #E6E6FA;
    line-height: 22px;
    text-align: center;
    color: #666;
    font-size: 14px;
}

ol,
ul {
    padding: 0;
    list-style: none;
}

li input {
    position: absolute;
    top: 2px;
    left: 10px;
    width: 22px;
    height: 22px;
    cursor: pointer;
}

p {
    margin: 0;
}

li p input {
    top: 3px;
    left: 40px;
    width: 70%;
    height: 20px;
    line-height: 14px;
    text-indent: 5px;
    font-size: 14px;
}

li {
    height: 32px;
    line-height: 32px;
    background: #fff;
    position: relative;
    margin-bottom: 10px;
    padding: 0 45px;
    border-radius: 3px;
    border-left: 5px solid #629A9C;
    box-shadow: 0 1px 2px rgba(0, 0, 0, 0.07);
}

ol li {
    cursor: move;
}

ul li {
    border-left: 5px solid #999;
    opacity: 0.5;
}

li a {
    position: absolute;
    top: 2px;
    right: 5px;
    display: inline-block;
    width: 14px;
    height: 12px;
    border-radius: 14px;
    border: 6px double #FFF;
    background: #CCC;
    line-height: 14px;
    text-align: center;
    color: #FFF;
    font-weight: bold;
    font-size: 14px;
    cursor: pointer;
}

footer {
    color: #666;
    font-size: 14px;
    text-align: center;
}

footer a {
    color: #666;
    text-decoration: none;
    color: #999;
}

@media screen and (max-device-width: 620px) {
    section {
        width: 96%;
        padding: 0 2%;
    }
}

@media screen and (min-width: 620px) {
    section {
        width: 600px;
        padding: 0 10px;
    }
}

网站布局较为简单，附上html与css作为参考，事件列表通过js动态添加

ToDoList使用本地存储localStorage，可以使数据在浏览器关闭后再次打开不会丢失

$(function () {
    //1.按下回车 把数据存储到本地存储里面
    //存储的数据格式 var todolist = [{title:"xxx",done:false}]
    load()
    $("#title").on("keydown", function (e) {
        if (e.keyCode === 13) {
            if ($(this).val() === "") {
                alert("不能为空")
            } else {
                //先读取本地存储的来源数据
                var local = getData();
                // console.log(local);
                //把local数组进行更新数据把最新的数据追加给local数组
                local.push({ title: $(this).val(), done: false });
                //把这个数组local 存储给本地存储
                saveData(local);
                //2.toDoList 本地存储数据渲染加载到页面
                load();
                $(this).val("")
            }
        }
    });
    //3.toDoList删除操作
    $("ol,ul").on("click", "a", function () {
        //先获取本地存储
        var data = getData();
        //修改数据
        var index = $(this).attr("id")
        data.splice(index, 1);
        //保存到本地存储
        saveData(data)
        //重新渲染页面
        load()
    })
    //4.toDoList待完成和已完成选项操作
    $("ul,ol").on("click", "input", function () {
        // 先获取本地数据
        var data = getData();
        // 修改数据
        var index = $(this).siblings("a").attr("id");
        data[index].done = $(this).prop("checked");
        // 保存到本地存储
        saveData(data)
        // 重新渲染页面
        load()
    })
    //读区本地存储的数据
    function getData() {
        var data = localStorage.getItem("todolist")
        if (data != null) {
            //本地存储里面数据是字符串格式的，但是我们需要的是对象格式的
            return JSON.parse(data)
        } else {
            return []
        }
    }
    //保存本地存储数据
    function saveData(data) {
        localStorage.setItem("todolist", JSON.stringify(data))
    }
    //渲染加载数据
    function load() {
        var data = getData();
        var todoCount = 0;//正在进行个数
        var doneCount = 0;//已经完成个数
        console.log(data);
        //遍历之前先要清空ol里面的元素内容
        $("ol,ul").empty();
        //遍历
        $.each(data, function (i, n) {
            // console.log(n);
            if (n.done) {
                $("ul").prepend("<li><input type='checkbox' checked='checked'><p>" + n.title + "</p><a href='javascript:;' id=" + i + "></a></li>")
                doneCount++
            } else {
                $("ol").prepend("<li><input type='checkbox'><p>" + n.title + "</p><a href='javascript:;' id=" + i + "></a></li>")
                todoCount++
            }
        });
        $("#todocount").text(todoCount)
        $("#donecount").text(doneCount)
    }
})