node.js - 如何循环遍历 Node.js 数组

Question

如何显示数组的变量？

代码:

   console.log(rooms);
   for (var i in rooms) {
      console.log(i);
   }

输出:

{ rooms: 
       [ { room: 'Raum 1', persons: 1 },
         { room: 'R2', persons: 2 },
         { room: 'R3', persons: 3 } ] }
rooms

Answer 1

For..in用于循环一个对象的属性，看起来你想循环一个数组，你应该使用For Of , forEach或 For

for(const val of rooms) {
    console.log(val)
}