连续赋值 js中连续赋值问题(关键理解下图,就可以明白) https://segmentfault.com/a/1190000008475665 如有帮助,请感谢sf作者!!! var a = {n: 1}; var b = a; a.x = a = {n: 2}; console.log(a.x); //undefined console.log(b.x); //{n:2}