es2021

//＃34;或者等于＆＃34; x || = y; x || （x = y）; //＃34;和和等于＆＃34; x＆amp;＆amp; = y; x＆amp;＆amp; （x = y）; //＃34; QQ等于＆＃34; x ?? = y; x ?? （x = y）; const updateId = user =......