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VueLearn
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记事本练习.html

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

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>记事本</title>
</head>

<body>
    <h2>记事本</h2>
    <div id="app">
        <div>
            <input type="text" placeholder="请输入内容" v-model="inputValue" @keyup.enter="add">
        </div>
        <div>
            <ul>
                <li v-for="(item,index) in list">
                    <span>{{index+1}}{{item}}</span>
                    <button @click="remove(index)">删除</button>
                </li>
            </ul>
        </div>
        <div>
            <!-- 两种隐藏和显示的方式 -->
            <span v-if="list.length!=0">{{list.length}}条日志</span>
            <button v-show="list.length!=0" @click="clear">清空日志</button>
        </div>
    </div>

    <script src="https://cdn.jsdelivr.net/npm/vue/dist/vue.js"></script>

    <script>
        var app = new Vue({
            el: "#app",
            data: {
                list: [
                    "写代码", "吃饭", "睡觉"
                ],
                inputValue: "好好学习"
            },
            methods: {
                add: function () {
                    this.list.push(this.inputValue);
                },
                remove: function (index) {
                    this.list.splice(index, 1);
                },
                clear:function(){
                    this.list=[];
                }
            }
        })
    </script>
</body>

</html>