页面弹动消失了

请问，我在pages.json里设置了一次bounce为none，但之后因为效果不好删除了，但是页面的弹动效果却没有回复，即使把页面内容都删空也不可回复，现在pages.json里是这样的，应该没有会影响到页面弹动的选项了吧，为什么不可弹动了呢？

{  
    "pages": [{  
            "path": "pages/index/index",  
            "style": {    
            "navigationBarTitleText": "收藏",  
            "app-plus": {    
            "titleNView": false,  
            "scrollIndicator":"none"  
        }   
        }    
        },{  

            "path": "pages/fenlei/fenlei",  
            "style": {    
            "navigationBarTitleText": "分类",  
            "app-plus": {    
                "titleNView": false,  
                "scrollIndicator":"none",  
                "pullToRefresh": {  
                    "support": true,  
                    "color": "#FBBD08",  
                    "style": "circle",  
                    "offset": "10%"  
                }  
        }   
        }    
        },{  

            "path": "pages/list/list",  
            "style": {}  
        },  
        {  
            "path": "pages/detail/detail",  
            "style": {}  
        },  
        {  
           "path": "pages/demo",  
           "style": {  
              "navigationBarTitleText": "演示",  
                "enablePullDownRefresh": true  
              }  
        },  
        {  
            "path": "pages/ucenter/ucenter",  
            "style": {  
                "navigationBarTitleText": "个人中心",  
                "app-plus": {    
                    "titleNView": false    
                }   
            }  
        }  
    ],  
    "tabBar": {  
        "color": "#FFFFFF",  
        "selectedColor": "#FBBD08",  
        "backgroundColor": "#292929",  
        "borderStyle": "black",  
        "list": [{  
            "pagePath": "pages/index/index",  
            "iconPath": "static/home.png",  
            "selectedIconPath": "static/home-active.png",  
            "text": "首页"  
        }, {  
            "pagePath": "pages/fenlei/fenlei",  
            "iconPath": "static/home.png",  
            "selectedIconPath": "static/home-active.png",  
            "text": "分类"  
        }, {  
            "pagePath": "pages/list/list",  
            "iconPath": "static/home.png",  
            "selectedIconPath": "static/home-active.png",  
            "text": "新闻"  
        }, {  
            "pagePath": "pages/ucenter/ucenter",  
            "iconPath": "static/center.png",  
            "selectedIconPath": "static/home-active.png",  
            "text": "我的"  
        }]  
    },  
    "globalStyle": {  
                "navigationBarBackgroundColor": "#292929",  
                "navigationBarTitleText": "ColorUi for UniApp",  
                "navigationStyle": "default",  
                "navigationBarTextStyle": "white"  
            },  
            "usingComponts": true  
}