Operating mechanism applet
Cold start and hot start
Cold start: After the first time you open and destroy open again
Hot start (do not restart): it has opened, opened again within 5 minutes, switching directly to the front
Foreground and background
When the applet is running: Reception
Click to leave :( background, or home key to leave the micro-letter) to leave but did not destroy
Destruction of small programs
After the applet into the background, (5 minutes) is not destroyed immediately, may be destroyed after 5 minutes,
If the program takes up little system resources is too high, sustainable resource-intensive, it will be destroyed or micro-channel system of the client's recovery initiative
Update mechanism
Detects the version update
（https://developers.weixin.qq.com/miniprogram/dev/api/base/update/UpdateManager.html）
use:
//Check for updates
checkUpdate(){
const updateManager = wx.getUpdateManager()
// detects the version update
updateManager.onCheckForUpdate((res1)=>{
console.log("onCheckForUpdate.res:", res1) //{hasUpdate: false}
if (res1.hasUpdate){
console.log("hasUpate")
updateManager.onUpdateReady(()=>{
console.log("onUpdateReady")
wx.showModal({
title: 'update prompt'
content: 'The new version is ready, whether to restart the application? '
success: function(res){
console.log("success res:", res)//{errMsg:"showModal:ok",cancel:false,confirm:true}
if (res.confirm) {
// 新的版本已经下载好，调用 applyUpdate 应用新版本并重启
updateManager.applyUpdate()
}
}
})
})
updateManager.onUpdateFailed(function () {
// 新版本下载失败
console.log("onUpdateFailed")
})
}
})
}