function user() {
        this.name = 20;
};

var b = new user();
Object.defineProperty(b, 'name', {
    writable: false,
    value: 'ooo'
});
console.log(b.name = 50);

这句代码为什么会输出50?
--
修改:ename FROM 221.221.22.*
FROM 221.221.22.*

assignment expressions return the right-hand value
you can find that in ES5 standard, I do not remember exactly which page

【 在 ename (ename) 的大作中提到: 】
: function b() {
:         this.name = 20;
: };
: ...................
--
FROM 180.173.119.*

已经修改对象名，谢谢。
但依然返回这个。

【 在 ottffsse 的大作中提到: 】
: 错误太初级了。。。。b被声明两次。
:
--
FROM 221.221.22.*

b.name=50; //this expression "b.name=50" is evaluated as 50, that is, the right side to the equal operator. 'cuz b.name is not writable, b.name, however,  is unchanged
//if you run console.log(b.name) again, you will see "ooo", not 50.

【 在 ename (ename) 的大作中提到: 】
: function user() {
:         this.name = 20;
: };
: ...................
--
FROM 183.95.135.*

就是说当b.name不可以写时，这句赋值语句返回的是右侧的值？

【 在 ottffsse 的大作中提到: 】
: b.name=50; //this expression "b.name=50" is evaluated as 50, that is, the right side to the equal operator. 'cuz b.name is not writable, b.name, however,  is unchanged
: //if you run console.log(b.name) again, you will see "ooo", not 50.
:
--
FROM 221.221.22.*