To listen to the data in app.js using a timer in the sub-assembly to monitor data changes app.js inside, there are many other ways people online, very good, but I was not able to understand their own to do this with a timer, the performance may not be so good. . .
1. app.js stored data, and acquires the value of the parent component changed.
The App ({
GlobalData: {
lastRelVal: '', // need to monitor data
},
// updated in real time data
setChangeData (Data) {
this.globaldata.lastRelVal Data =
}
});
2. Change the data in the parent component.
let app = getApp () // introduced app.js
var lastRelVal = ''
Page ({
Data: {
},
// page load
the onReady () {
this.setData ()
},
// change the value inside app.js
the setData () {
for (the let I = 0; I <= 10; I ++) {
lastRelVal = I
app.setChangeData (lastRelVal)
}
},
});
3. 1s taken every value in the subassembly app.js
app = getApp the let ()
the Component ({
Data: {
},
// page load
the onReady () {
this.setData ()
},
// received value app.js inside
didMount () {
// get every 1s app .js inside lastRelVal value
this.interval the setInterval = (() => {
the console.log ( "new value taken spacer 1s", app.globaldata.lastRelVal)
}, 1000)
},
});