浏览器关闭或Express更改路由时如何在node js中停止间隔

Question

这是我的真实项目的代码片段。当我转到'/tracking‘页面时，间隔开始了，这没问题...

但当我转到'/app‘时，interval也在运行。我知道interval是一个全局的东西，由clearInterval(myTimer)关闭，我的问题是，在这种情况下-

如何在更改路线或关闭浏览器时关闭间隔，谢谢，

var express = require('express');
var app     = express();

app.get('/app', function(req, res) {
   res.send("this is app page");
 });


app.get('/tracking', function(req, res) {

    var myTimer= setInterval(function() {
        console.log("Tracking Start between 20 second interval")
    }, 20000);

    res.send('this is a tracking page!');  
});

//Lets define a port we want to listen to
const PORT = 3001;

app.listen(PORT);
console.log('Magic happens on port ' + PORT);

Answer 1

var express = require('express');
var app     = express();
var timer = null;

app.use(function(req, res, next) {
   // remove this line if you are not using HTML5 routing
   if(timer) clearInterval(timer);

   req.on('close', function() { if(timer) clearInterval(timer) });
   next();
});

app.get('/app', function(req, res) {
   res.send("this is app page");
 });


app.get('/tracking', function(req, res) {

    timer= setInterval(function() {
        console.log("Tracking Start between 20 second interval")
    }, 20000);

    res.send('this is a tracking page!');  
});

//Lets define a port we want to listen to
const PORT = 3001;

app.listen(PORT);
console.log('Magic happens on port ' + PORT);

像这样的东西可能行得通。我不知道你是否在使用HTML5路由(不需要重新加载)。但如果没有，你可以删除我已经注释过的部分，因为我认为event close会在重新加载时触发。