books:[
{title:'vue基础教学',price:12.00},
{title:'js基础教学',price:20.00},
{title:'头脑风暴',price:14.00}
]
1.for循环
let total=0
for(var i=0;i<this.books.length;i++){
total+=this.books[i].price
}
return total
2.for...in循环
let total=0
for(const i in this.books){
total+=this.books[i].price
}
return total
3.for...of循环
let total=0
for(const i of this.books){
total+=i.price
}
return total
4.reduce
return this.books.reduce((a,b)=>{
return a+b.price
},0)
