index_iframe.html左侧边栏无法滚动

## 该问题是怎么引起的？
好像是因为引入了
<script src="dist/js/app_iframe.js"></script>
引起的左侧边栏无法滚动

## 重现步骤
将左侧边栏Forms
 {
                id: "9002",
                text: "Forms",
                icon: "fa fa-edit",
                children: [
                    {
                        id: "90021",
                        text: "advanced",
                        url: "forms/advanced_iframe.html",
                        targetType: "iframe-tab",
                        icon: "fa fa-circle-o"
                    },
                    {
                        id: "90022",
                        text: "general",
                        url: "forms/general_iframe.html",
                        targetType: "iframe-tab",
                        icon: "fa fa-circle-o"
                    },
                    {
                        id: "90023",
                        text: "editors",
                        url: "forms/editors_iframe.html",
                        targetType: "iframe-tab",
                        icon: "fa fa-circle-o"
                    }
                ]
            },

复制多次，使左侧边栏菜单超出屏幕范围，发现左侧菜单无法滚动，无法查看点击靠后的菜单

## 报错信息

没有报错，我也是很无奈啊

韦驮天/AdminLTE With Iframe

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韦驮天/AdminLTE With Iframe .gitee-modal { width: 500px !important; }

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