在这里插入图片描述

在这里插入图片描述

<!DOCTYPE html>
<html lang="zh-CN">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
</head>
<style>
</style>

<body>
    <div id="app" style="margin-top: 200px;">
        <!-- placement出现位置 delay触发为hover显示/隐藏的延迟时间 -->
        <el-form style="width: 200px;">
            <el-popover ref="popover" :open-delay="200" popper-class="detail" :close-delay="1000" placement="right"
                trigger="hover">
                <el-select value="" slot="reference">
                    <el-option value="1" label="focus"></el-option>
                </el-select>
                <el-button style="margin-left: 5px;">激活</el-button>

            </el-popover>
        </el-form>
    </div>

    <script src="https://cdn.bootcdn.net/ajax/libs/vue/2.6.0/vue.js"></script>
    <script src="https://cdn.bootcdn.net/ajax/libs/element-ui/2.15.3/index.js"></script>
    <script>
        new Vue({
            el: '#app'
        });
    </script>
</body>

</html>

<!DOCTYPE html>
<html lang="zh-CN">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
</head>

<body>
    <div id="app">
        <div class="a" 
        @mouseenter="enter()"     
        @mouseleave="leave()"
        >   <input type="text" value="这边是列表">
            <button class="b" v-show="flag" :title="message">查看详情</button>
        </div>
    </div>
    <script src="https://cdn.bootcdn.net/ajax/libs/vue/2.6.0/vue.js"></script>
    <script>
        const app = new Vue({
            el: '#app',
            data() {
                return {
                    flag: false,
                    message: '页面加载于 ' + new Date().toLocaleString()
                };
            },
            methods: {
                enter() {
                    this.flag = true
                },
                leave() {
                    this.flag = false
                }
            }
        });
    </script>
</body>

</html>
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