vue指令应用--记事本

x33g5p2x  于11个月前 转载在 Vue.js  
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一、应用介绍

该应用实现以下功能:
1、在候选框写下要做的内容按下回车可在列表中显示。
2、点击每个事项右边的x可以删除事项。
3、点击右下角clear可以清空所有事项。
4、左下角显示剩余事项的条数。
5、当记事本中无事项时,隐藏clear和剩余事项条数。

二、功能分析

1、功能一可以使用v-model关联同步候选框内容,使用@keyup.enter绑定事件使内容在记事本中显示。
2、生成删除事项可以用v-for动态生成列表结构,里面信息可以用数组存储。
3、无事项时,隐藏功能可以使用v-show或者v-if,这里建议使用v-show。

三、代码及效果

HTML,js部分

<!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>Document</title>
    <link rel="stylesheet" href="记事本.css">
</head>

<body>
    <!-- 主体区域 -->
    <section id="todoapp">
        <!-- 输入框 -->
        <header class="header">
            <h1>todo记事本</h1>
            <input v-model="inputValue" @keyup.enter="add" autofocus="autofocus" autocomplete="off" placeholder="请输入任务" class="new-todo">
        </header>
        <!-- 列表区域 -->
        <section class="main">
            <ul class="todo-list">
                <li class="todo" v-for="(item,index) in list">
                    <div class="view">
                        <span class="index">{{ index+1 }}.</span>
                        <label>{{ item }}</label>
                        <button class="destroy" @click="remove(index)"></button>
                    </div>
                </li>
            </ul>
        </section>
        <!-- 统计和清空 -->
        <footer class="footer" v-show="list.length!=0">
            <span class="todo-count" v-if="list.length!=0">
          <strong>{{ list.length }}</strong> items left
        </span>
            <button v-show="list.length!=0" class="clear-completed" @click="clear">
          Clear
        </button>
        </footer>
    </section>
    <!-- 底部 -->
    <!-- <footer class="info">
        <p>
            <a href="http://www.itheima.com/"><img src="./img/black.png" alt="" /></a>
        </p>
    </footer> -->
    </section>
    <!-- 开发环境版本,包含了有帮助的命令行警告 -->
    <script src="https://cdn.jsdelivr.net/npm/vue@2/dist/vue.js"></script>

    <script>
        var app = new Vue({
            el: "#todoapp",
            data: {
                list: ["吃饭", "睡觉", "打豆豆"],
                inputValue: "写代码",
            },
            methods: {
                add: function() {
                    if (this.inputValue != '') {
                        this.list.push(this.inputValue);
                    }

                },
                remove: function(index) {
                    this.list.splice(index, 1);
                },
                clear: function() {
                    this.list = [];
                }
            }
        })
    </script>
</body>

</html>

css部分

html,
body {
    margin: 0;
    padding: 0;
}

body {
    background: #fff;
}

button {
    margin: 0;
    padding: 0;
    border: 0;
    background: none;
    font-size: 100%;
    vertical-align: baseline;
    font-family: inherit;
    font-weight: inherit;
    color: inherit;
    -webkit-appearance: none;
    appearance: none;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font: 14px "Helvetica Neue", Helvetica, Arial, sans-serif;
    line-height: 1.4em;
    background: #f5f5f5;
    color: #4d4d4d;
    min-width: 230px;
    max-width: 550px;
    margin: 0 auto;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    font-weight: 300;
}

:focus {
    outline: 0;
}

.hidden {
    display: none;
}

#todoapp {
    background: #fff;
    margin: 180px 0 40px 0;
    position: relative;
    box-shadow: 0 2px 4px 0 rgba(0, 0, 0, 0.2), 0 25px 50px 0 rgba(0, 0, 0, 0.1);
}

#todoapp input::-webkit-input-placeholder {
    font-style: italic;
    font-weight: 300;
    color: #e6e6e6;
}

#todoapp input::-moz-placeholder {
    font-style: italic;
    font-weight: 300;
    color: #e6e6e6;
}

#todoapp input::input-placeholder {
    font-style: italic;
    font-weight: 300;
    color: gray;
}

#todoapp h1 {
    position: absolute;
    top: -160px;
    width: 100%;
    font-size: 60px;
    font-weight: 100;
    text-align: center;
    color: rgba(175, 47, 47, .8);
    -webkit-text-rendering: optimizeLegibility;
    -moz-text-rendering: optimizeLegibility;
    text-rendering: optimizeLegibility;
}

.new-todo,
.edit {
    position: relative;
    margin: 0;
    width: 100%;
    font-size: 24px;
    font-family: inherit;
    font-weight: inherit;
    line-height: 1.4em;
    border: 0;
    color: inherit;
    padding: 6px;
    border: 1px solid #999;
    box-shadow: inset 0 -1px 5px 0 rgba(0, 0, 0, 0.2);
    box-sizing: border-box;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

.new-todo {
    padding: 16px;
    border: none;
    background: rgba(0, 0, 0, 0.003);
    box-shadow: inset 0 -2px 1px rgba(0, 0, 0, 0.03);
}

.main {
    position: relative;
    z-index: 2;
    border-top: 1px solid #e6e6e6;
}

.toggle-all {
    width: 1px;
    height: 1px;
    border: none;
    /* Mobile Safari */
    opacity: 0;
    position: absolute;
    right: 100%;
    bottom: 100%;
}

.toggle-all+label {
    width: 60px;
    height: 34px;
    font-size: 0;
    position: absolute;
    top: -52px;
    left: -13px;
    -webkit-transform: rotate(90deg);
    transform: rotate(90deg);
}

.toggle-all+label:before {
    content: "❯";
    font-size: 22px;
    color: #e6e6e6;
    padding: 10px 27px 10px 27px;
}

.toggle-all:checked+label:before {
    color: #737373;
}

.todo-list {
    margin: 0;
    padding: 0;
    list-style: none;
    max-height: 420px;
    overflow: auto;
}

.todo-list li {
    position: relative;
    font-size: 24px;
    border-bottom: 1px solid #ededed;
    height: 60px;
    box-sizing: border-box;
}

.todo-list li:last-child {
    border-bottom: none;
}

.todo-list .view .index {
    position: absolute;
    color: gray;
    left: 10px;
    top: 20px;
    font-size: 16px;
}

.todo-list li .toggle {
    text-align: center;
    width: 40px;
    /* auto, since non-WebKit browsers doesn't support input styling */
    height: auto;
    position: absolute;
    top: 0;
    bottom: 0;
    margin: auto 0;
    border: none;
    /* Mobile Safari */
    -webkit-appearance: none;
    appearance: none;
}

.todo-list li .toggle {
    opacity: 0;
}

.todo-list li .toggle+label {
    /* Firefox requires `#` to be escaped - https://bugzilla.mozilla.org/show_bug.cgi?id=922433 IE and Edge requires *everything* to be escaped to render, so we do that instead of just the `#` - https://developer.microsoft.com/en-us/microsoft-edge/platform/issues/7157459/ */
    background-image: url("data:image/svg+xml;utf8,%3Csvg%20xmlns%3D%22http%3A//www.w3.org/2000/svg%22%20width%3D%2240%22%20height%3D%2240%22%20viewBox%3D%22-10%20-18%20100%20135%22%3E%3Ccircle%20cx%3D%2250%22%20cy%3D%2250%22%20r%3D%2250%22%20fill%3D%22none%22%20stroke%3D%22%23ededed%22%20stroke-width%3D%223%22/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: center left;
}

.todo-list li .toggle:checked+label {
    background-image: url("data:image/svg+xml;utf8,%3Csvg%20xmlns%3D%22http%3A//www.w3.org/2000/svg%22%20width%3D%2240%22%20height%3D%2240%22%20viewBox%3D%22-10%20-18%20100%20135%22%3E%3Ccircle%20cx%3D%2250%22%20cy%3D%2250%22%20r%3D%2250%22%20fill%3D%22none%22%20stroke%3D%22%23bddad5%22%20stroke-width%3D%223%22/%3E%3Cpath%20fill%3D%22%235dc2af%22%20d%3D%22M72%2025L42%2071%2027%2056l-4%204%2020%2020%2034-52z%22/%3E%3C/svg%3E");
}

.todo-list li label {
    word-break: break-all;
    padding: 15px 15px 15px 60px;
    display: block;
    line-height: 1.2;
    transition: color 0.4s;
}

.todo-list li.completed label {
    color: #d9d9d9;
    text-decoration: line-through;
}

.todo-list li .destroy {
    display: none;
    position: absolute;
    top: 0;
    right: 10px;
    bottom: 0;
    width: 40px;
    height: 40px;
    margin: auto 0;
    font-size: 30px;
    color: #cc9a9a;
    margin-bottom: 11px;
    transition: color 0.2s ease-out;
}

.todo-list li .destroy:hover {
    color: #af5b5e;
}

.todo-list li .destroy:after {
    content: "×";
}

.todo-list li:hover .destroy {
    display: block;
}

.todo-list li .edit {
    display: none;
}

.todo-list li.editing:last-child {
    margin-bottom: -1px;
}

.footer {
    color: #777;
    padding: 10px 15px;
    height: 20px;
    text-align: center;
    border-top: 1px solid #e6e6e6;
}

.footer:before {
    content: "";
    position: absolute;
    right: 0;
    bottom: 0;
    left: 0;
    height: 50px;
    overflow: hidden;
    box-shadow: 0 1px 1px rgba(0, 0, 0, 0.2), 0 8px 0 -3px #f6f6f6, 0 9px 1px -3px rgba(0, 0, 0, 0.2), 0 16px 0 -6px #f6f6f6, 0 17px 2px -6px rgba(0, 0, 0, 0.2);
}

.todo-count {
    float: left;
    text-align: left;
}

.todo-count strong {
    font-weight: 300;
}

.filters {
    margin: 0;
    padding: 0;
    list-style: none;
    position: absolute;
    right: 0;
    left: 0;
}

.filters li {
    display: inline;
}

.filters li a {
    color: inherit;
    margin: 3px;
    padding: 3px 7px;
    text-decoration: none;
    border: 1px solid transparent;
    border-radius: 3px;
}

.filters li a:hover {
    border-color: rgba(175, 47, 47, 0.1);
}

.filters li a.selected {
    border-color: rgba(175, 47, 47, 0.2);
}

.clear-completed,
html .clear-completed:active {
    float: right;
    position: relative;
    line-height: 20px;
    text-decoration: none;
    cursor: pointer;
}

.clear-completed:hover {
    text-decoration: underline;
}

.info {
    margin: 50px auto 0;
    color: #bfbfbf;
    font-size: 15px;
    text-shadow: 0 1px 0 rgba(255, 255, 255, 0.5);
    text-align: center;
}

.info p {
    line-height: 1;
}

.info a {
    color: inherit;
    text-decoration: none;
    font-weight: 400;
}

.info a:hover {
    text-decoration: underline;
}

/* Hack to remove background from Mobile Safari. Can't use it globally since it destroys checkboxes in Firefox */

@media screen and (-webkit-min-device-pixel-ratio: 0) {
    .toggle-all,
    .todo-list li .toggle {
        background: none;
    }
    .todo-list li .toggle {
        height: 40px;
    }
}

@media (max-width: 430px) {
    .footer {
        height: 50px;
    }
    .filters {
        bottom: 10px;
    }
}

效果图

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