array.splice(i,1) //删除数组中下标为 i 的元素
//blogs 是对象blog的数组
for(let i in blogs){
if(blogs[i]._id == id){
blogs.splice(i,1)
break;
}
}
delete 语法
arr = [1, 2, 3, 4, 5]
console.log(arr) //[ 1, 2, 3, 4, 5 ]
delete arr[2]
console.log(arr) //[ 1, 2, <1 empty item>, 4, 5 ]
console.log(arr[2]) //undefined