JavaScript 中“...”的多种用途及代码实例

     const arr1 = [1, 2, 3];
     const arr2 = [4, 5, 6];
     const combinedArray = [...arr1,...arr2];
     console.log(combinedArray); // [1, 2, 3, 4, 5, 6]

     function sum(a, b, c) {
       return a + b + c;
     }
     const numbers = [1, 2, 3];
     console.log(sum(...numbers)); // 6

     const obj1 = { a: 1, b: 2 };
     const obj2 = { c: 3,...obj1 };
     console.log(obj2); // { c: 3, a: 1, b: 2 }

function addNumbers(...numbers) {
  return numbers.reduce((sum, num) => sum + num, 0);
}
console.log(addNumbers(1, 2, 3, 4, 5)); // 15

this.data.orderList
      .filter(item => item.quantity > 0)
      .map(item => ({
        ...item,
        ticket_des: '' // 直接将ticket_des设置为空字符串  
      }));