JQ 简单实现 todolist

效果图：

相关知识：

localstorage的使用、jq事件、使用jq进行增删查改。

相关代码（还需要引入jq文件）：

html:

<!DOCTYPE html>
<html>

<head>
    <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=no" />
    <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/todolist.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; 2020 todolist.cn
    </footer>


</body>

</html>

js/jq ：

$(function () {
    var list = [];
    load();
    //键盘回车事件
    $('#title').on('keydown', function (e) {
        if (e.keyCode == 13) {
            if ($(this).val() != '') {
                list.push({
                    'name': $(this).val(),
                    'done': false
                })
            } else {
                alert('请输入内容');
            }
            setData(list);
            $(this).val('');
            load();
        }
    })

    //checkbox事件
    $('ul,ol').on('click', 'input', function () {
        list[$(this).parent().attr('data-index')].done = !list[$(this).parent().attr('data-index')].done;
        setData(list);
        load();
    })

    //a删除事件
    $('ul,ol').on('click', 'a', function () {
        list.splice($(this).parent().attr('data-index'), 1);
        setData(list);
        load();
    })

    function setData(list) {
        localStorage.setItem('list', JSON.stringify(list));
    }

    function getData() {
        var list = localStorage.getItem('list');
        if (list != null) {
            return JSON.parse(list);
        } else {
            return []
        }
    }

    function load() {
        var todocount = 0;
        var donecount = 0;
        $('ol,ul').html('');
        list = getData();
        $.each(list, function (i, ele) {
            if (!ele.done) {
                var li = $('<li data-index="' + i + '"><input type="checkbox"></input>' + ele.name + '<a href="javascript:;"></a></li>');
                $('ol').append(li);
                todocount++;
            } else {
                var li = $('<li data-index="' + i + '"><input type="checkbox" checked="checked"></input>' + ele.name + '<a href="javascript:;"></a></li>');
                $('ul').append(li);
                donecount++;
            }
        })
        $('#todocount').text(todocount);
        $('#donecount').text(donecount);
    }
})

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;
    }
}

JQ 简单实现 todolist

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