var reg = /^\d+|(-[1-9])$/;for (i = -10; i <= 10; i++) {    console.log(i + ': ', reg.test(i))}

测试结果

-10:  false-9:  true-8:  true-7:  true-6:  true-5:  true-4:  true-3:  true-2:  true-1:  true0:  true1:  true2:  true3:  true4:  true5:  true6:  true7:  true8:  true9:  true10:  true[Finished in 0.3s]