process.on('exit', function (code) {/*程序即将退出时执行某个回调函数*/
console.log('about to exit with code: ' + code);
});
process.nextTick(function () {/*将在下一轮事件循环中调用*/
console.log('nextTick callback!');
});
console.log('nextTick was set!');/*优先执行*/
Debugger listening on port 45724
nextTick was set! nextTick callback! about to exit with code: 0
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