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<!DOCTYPE html>
<html lang="en">
<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>el-cascader bug</title>
    <link rel="stylesheet" href="https://unpkg.com/element-ui@2.4.6/lib/theme-chalk/index.css">
    <script src="https://cdn.jsdelivr.net/npm/vue@2.5.17/dist/vue.js"></script>
    <script src="https://unpkg.com/element-ui@2.4.6/lib/index.js"></script>
</head>
<body>
    <div id="app">
        <el-cascader
            :change-on-select="true"
            expand-trigger="hover"
            :options="options"
            v-model="option"
            @change="handleChange">
        </el-cascader>
    </div>
</body>
</html>
 
new Vue({
            data: {
                option: [],
                options: [{
                    value: 'zhinan',
                    label: '指南',
                    children: [{
                        value: 'shejiyuanze',
                        label: '设计原则',
                        children: [{
                        value: 'yizhi',
                        label: '一致'
                        }, {
                        value: 'fankui',
                        label: '反馈'
                        }, {
                        value: 'xiaolv',
                        label: '效率'
                        }, {
                        value: 'kekong',
                        label: '可控'
                        }]
                    }, {
                        value: 'daohang',
                        label: '导航',
                        children: [{
                        value: 'cexiangdaohang',
                        label: '侧向导航'
                        }, {
                        value: 'dingbudaohang',
                        label: '顶部导航'
                        }]
                    }]
                    }, {
                    value: 'zujian',
                    label: '组件',
                    children: [{
                        value: 'basic',
                        label: 'Basic',
                        children: [{
                        value: 'layout',
                        label: 'Layout 布局'
                        }, {
                        value: 'color',
                        label: 'Color 色彩'
                        }, {
                        value: 'typography',
                        label: 'Typography 字体'
                        }, {
                        value: 'icon',
                        label: 'Icon 图标'
                        }, {
                        value: 'button',
                        label: 'Button 按钮'
                        }]
                    }, {
                        value: 'form',
                        label: 'Form',
                        children: [{
                        value: 'radio',
                        label: 'Radio 单选框'
                        }, {
                        value: 'checkbox',
                        label: 'Checkbox 多选框'
                        }, {
                        value: 'input',
                        label: 'Input 输入框'
                        }, {
                        value: 'input-number',
                        label: 'InputNumber 计数器'
                        }, {
                        value: 'select',
                        label: 'Select 选择器'
                        }, {
                        value: 'cascader',
                        label: 'Cascader 级联选择器'
                        }, {
                        value: 'switch',
                        label: 'Switch 开关'
                        }, {
                        value: 'slider',
                        label: 'Slider 滑块'
                        }, {
                        value: 'time-picker',
                        label: 'TimePicker 时间选择器'
                        }, {
                        value: 'date-picker',
                        label: 'DatePicker 日期选择器'
                        }, {
                        value: 'datetime-picker',
                        label: 'DateTimePicker 日期时间选择器'
                        }, {
                        value: 'upload',
                        label: 'Upload 上传'
                        }, {
                        value: 'rate',
                        label: 'Rate 评分'
                        }, {
                        value: 'form',
                        label: 'Form 表单'
                        }]
                    }, {
                        value: 'data',
                        label: 'Data',
                        children: [{
                        value: 'table',
                        label: 'Table 表格'
                        }, {
                        value: 'tag',
                        label: 'Tag 标签'
                        }, {
                        value: 'progress',
                        label: 'Progress 进度条'
                        }, {
                        value: 'tree',
                        label: 'Tree 树形控件'
                        }, {
                        value: 'pagination',
                        label: 'Pagination 分页'
                        }, {
                        value: 'badge',
                        label: 'Badge 标记'
                        }]
                    }, {
                        value: 'notice',
                        label: 'Notice',
                        children: [{
                        value: 'alert',
                        label: 'Alert 警告'
                        }, {
                        value: 'loading',
                        label: 'Loading 加载'
                        }, {
                        value: 'message',
                        label: 'Message 消息提示'
                        }, {
                        value: 'message-box',
                        label: 'MessageBox 弹框'
                        }, {
                        value: 'notification',
                        label: 'Notification 通知'
                        }]
                    }, {
                        value: 'navigation',
                        label: 'Navigation',
                        children: [{
                        value: 'menu',
                        label: 'NavMenu 导航菜单'
                        }, {
                        value: 'tabs',
                        label: 'Tabs 标签页'
                        }, {
                        value: 'breadcrumb',
                        label: 'Breadcrumb 面包屑'
                        }, {
                        value: 'dropdown',
                        label: 'Dropdown 下拉菜单'
                        }, {
                        value: 'steps',
                        label: 'Steps 步骤条'
                        }]
                    }, {
                        value: 'others',
                        label: 'Others',
                        children: [{
                        value: 'dialog',
                        label: 'Dialog 对话框'
                        }, {
                        value: 'tooltip',
                        label: 'Tooltip 文字提示'
                        }, {
                        value: 'popover',
                        label: 'Popover 弹出框'
                        }, {
                        value: 'card',
                        label: 'Card 卡片'
                        }, {
                        value: 'carousel',
                        label: 'Carousel 走马灯'
                        }, {
                        value: 'collapse',
                        label: 'Collapse 折叠面板'
                        }]
                    }]
                    }, {
                    value: 'ziyuan',
                    label: '资源',
                    children: [{
                        value: 'axure',
                        label: 'Axure Components'
                    }, {
                        value: 'sketch',
                        label: 'Sketch Templates'
                    }, {
                        value: 'jiaohu',
                        label: '组件交互文档'
                    }]
                }]
            },
            methods: {
                handleChange: function(arr) {
                    console.log(JSON.stringify(arr))
                }
            }
        }).$mount('#app')
Output

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