03.剩余参数(ES6)

剩余参数有且只能有一个

  const sum = (printType,...args) => {
    const sum =args.reduce((prev, cur) => {
      return prev + cur;
    }, 0);
    // let sum = 0;
    // for (let i = 0; i < args.length; i++) {
    //   sum += args[i];
    // }
    console.log(printType,sum)
  };
  sum('10个参数',1, 2, 3, 4, 5, 6, 7, 8, 9, 10);
  sum('11个参数',1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11);.