ES6/2015 中的空安全属性访问（和条件赋值） - Null-safe property access (and conditional assignment) in ES6/2015

问题：

Is there a null -safe property access (null propagation / existence) operator in ES6 (ES2015/JavaScript.next/Harmony) like ?.在 ES6 (ES2015/JavaScript.next/Harmony) 中是否有一个null属性访问（null 传播/存在）运算符，比如?. in CoffeeScript for example?例如在CoffeeScript中？ Or is it planned for ES7?还是计划用于 ES7？

var aThing = getSomething()
...
aThing = possiblyNull?.thing

This will be roughly like:这将大致如下：

if (possiblyNull != null) aThing = possiblyNull.thing

Ideally the solution should not assign (even undefined ) to aThing if possiblyNull is null理想情况下，解决方案不应该分配（甚至undefined ），以aThing如果possiblyNull是null

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解决方案：

参考一： https://en.stackoom.com/question/2AqqE
参考二： https://stackoom.com/question/2AqqE