阿里 连续赋值的理解:原帖 http://www.iteye.com/topic/785445 底下某层楼理解的号 var a = {n:1}; var b = a; // 持有a,以回查 a.x = a = {n:2}; alert(a.x);// --> undefined alert(b.x);// --> [object Object]