We all know that the asynchronism of node makes it inconvenient to do any timing function.
for example, after starting timer A, funtion B is executed one second later. But as long as event C occurs halfway, functionD, is triggered immediately and A retiming. How can a function like this be implemented?
all know that node's asynchronism makes it inconvenient to do any timing function
I really don't know, except that the timing is not accurate (there are other tasks performing timer ). node there are many modules such as node-schedule that can handle scheduled tasks.
for example, after timer An is started, funtion B is executed one second later. But as long as event C occurs halfway, functionD, is triggered immediately and A retiming. How can a function like this be implemented?
of course, if that's all you need, it's easy to deal with. Take a chestnut.
const EventEmitter = require('events');
class MyTimerEmitter extends EventEmitter {
constructor() {
super();
this._timerA = null;
}
run() {
this._timerA = setTimeout(() => { console.log('finish') }, 1000)
}
reset() {
clearTimeout(this._timerA);
this.run();
}
}
const mte = new MyTimerEmitter();
mte.on('reset', function() {
console.log('reset!');
this.reset();
});
mte.run();
function test(i = 0) { //10reset
if (i < 10) {
iPP;
setTimeout((j) => {
mte.emit('reset');
test(j);
}, 500, i)
}
}
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