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                ### [應用生命周期](https://uniapp.dcloud.io/collocation/frame/lifecycle?id=app) `uni-app`支持如下應用生命周期函數: | 函數名 | 說明 | | --- | --- | | onLaunch | 當`uni-app`初始化完成時觸發(全局只觸發一次) | | onShow | 當`uni-app`啟動,或從后臺進入前臺顯示 | | onHide | 當`uni-app`從前臺進入后臺 | | onError | 當`uni-app`報錯時觸發 | | onUniNViewMessage | 對`nvue`頁面發送的數據進行監聽,可參考[nvue 向 vue 通訊](https://uniapp.dcloud.io/nvue-api?id=communication) | | onUnhandledRejection | 對未處理的 Promise 拒絕事件監聽函數(2.8.1+) | | onPageNotFound | 頁面不存在監聽函數 | | onThemeChange | 監聽系統主題變化 | **注意** * 應用生命周期僅可在`App.vue`中監聽,在其它頁面監聽無效。 * onlaunch里進行頁面跳轉,如遇白屏報錯,請參考[https://ask.dcloud.net.cn/article/35942](https://ask.dcloud.net.cn/article/35942) * onPageNotFound 頁面實際上已經打開了(比如通過分享卡片、小程序碼)且發現頁面不存在,才會觸發,api 跳轉不存在的頁面不會觸發(如 uni.navigateTo) **示例代碼一** ~~~ <script> // 只能在App.vue里監聽應用的生命周期 export default { onLaunch: function() { console.log('App Launch') }, onShow: function() { console.log('App Show') }, onHide: function() { console.log('App Hide') } } </script> ~~~ **示例代碼二* ``` <script> export default { onLaunch: function() { console.log('App Launch') }, onShow: function() { console.log('App Show') }, onHide: function() { console.log('App Hide') }, onPageNotFound(){ uni.navigateTo({ url: '/pages/404/404', success: res => {}, fail: () => {}, complete: () => {} }); } } </script> ``` 實例一 頁面2秒自動跳轉 ``` <script> export default { data() { return { } }, methods: { }, onLoad() { let timer = setTimeout(()=>{ clearTimeout(timer) uni.navigateTo({ url:"/pages/index/index" }) },2000) } } </script> ```
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