const s = ‘aaa_aa_a‘ const r1 = /a+/g const r2 = /a+/y console.log(r1.exec(s)) //aaa console.log(r2.exec(s)) //aaa console.log(r1.exec(s)) //aa console.log(r2.exec(s)) //null,必须以a开头才行
es6 y修饰符
原文：https://www.cnblogs.com/qjb2404/p/12209479.html
