var foo = {n: 1};
var bar = foo;
foo.x = foo = {n: 2};
console.log(foo.x);//undefined这个问题提问过好多次了。
https://.com/a/1190000004224719
var foo = {n: 1};
var bar = foo;
foo.x = foo = {n: 2};
console.log(foo.x);//undefined这个问题提问过好多次了。
https://.com/a/1190000004224719