CodePudding user response:

Before you use to judge that objects must exist

CodePudding user response:

Support the author, it is very useful

CodePudding user response:

Problem has been resolved, need condition judgment, first need to get this. Data. Gives goodLIst except value, otherwise can't run

CodePudding user response:

You also can use goodsList=this. Data. GoodsList. Concat (res) goods) for joining together, of course the two arrays should be not null,