node如何手动关闭子进程

Question

子进程child.js：setInterval(function(){console.log(1);},2000);父进程：constfs=require('fs');constout=fs.openSync('a.txt','a');consterr=fs.openSync('b.txt','a');constp=require('child_process').spawn('node',['child.js','a','b'],{'stdio':['ignore',out,err],'detached':true});p.unref();设置了spawn方法的参数'stdio':['ignore',out,err]和'detached':true后，子进程一直运行，关闭父进程的终端或者关闭IDE都不能终止，怎么办？