[{ id: '001', k: 'v1' }, { id: '002', k: 'v2' }]
转成
{
001: {id: "001", k: "v1"},
002: {id: "002", k: "v2"}
}
let arr = [{ id: '001', k: 'v1' }, { id: '002', k: 'v2' }]
let obj = {}
for (let i = 0; i < arr.length; i++) {
obj[arr[i].id] = arr[i]
}
console.log(obj)