js reduce

 

数组对象求和

let books = [
  { id: 100, name: '红楼梦', price: 100 },
  { id: 101, name: '西游记', price: 150 },
  { id: 102, name: '三国', price: 160 }
]
let res=books.reduce((prev,next)=>next.price+prev,0)