javascript - 如何在javascript中通过两个对象创建新对象

Question

我想知道如何在javascript中通过两个对象创建新对象。

迭代 obj1，并添加 obj2 值，在 JavaScript 中创建新对象

function getObject(obj1, obj2){
  let result={};
  Object.keys(obj1).forEach(key=>{
    if(key==="start" || key==="end"){
      result.time= obj1.start+"-"+obj1.end,
      result.qty= obj2.qty
    }
  }) 

}

var obj1 ={
  start: "16:01", end: "23:59", totalqty: 1065, totalamount: 8229170
}

var obj2 = {
  qty: 10, 
  amt: 120
}

预期输出

 {
   time: "16:01-23:59"
   val: 10 // represents obj2.qty,
   totalqty: 1065, 
   totalamount: 8229170,
   price: 120
 }

Answer 1

您可以编写一个函数并获取所需的属性:

var obj1 ={
  start: "16:01", end: "23:59", totalqty: 1065, totalamount: 8229170
}

var obj2 = {
  qty: 10,
  amt: 120
}

const merge = (obj1, obj2) => {
  return {
    time: obj1.start + '-' + obj1.end,
    val: obj2.qty,
    totalqty: obj1.totalqty,
    totalamount: obj1.totalamount,
    price: obj2.amt
  };
}

console.log(merge(obj1, obj2));

此外，您可以使用 spread 语法，但它会合并所有属性:

let obj1 ={
  start: "16:01", end: "23:59", totalqty: 1065, totalamount: 8229170
}

let obj2 = {
  qty: 10, 
  amt: 120
}

let merged = {...obj1, ...obj2};
console.log(merged );

或者尝试使用Object.assign()，它也会合并所有属性:

var obj1 ={
  start: "16:01", end: "23:59", totalqty: 1065, totalamount: 8229170
}

var obj2 = {
  qty: 10, 
  amt: 120
}

var result = Object.assign({}, obj1, obj2);
console.log(result);

Read more Object.assign() here.