node 防止端口挂掉 守护进程

var exec = require('child_process').exec;

check();

function check(){

var last = exec('lsof -i:3000');

last.on('exit',function(code){

if(code !=0){ run();

console.log('主服务已关闭，马上重启');

}else{

console.log('主服务活跃中')

} });

setTimeout(check,1000); }

function run(){

var last = exec('node serve.js');

last.on('exit',function(code){ if(code == 0){ console.log('主服务重启成功');

}else{

console.log('主服务重启失败');

} }) }