将使用多个参数的函数转换成一系列使用一个参数的函数的技术

    1. function curry(fn) {
    2.     let judge = (...args) => {
    3.         if (args.length === fn.length) return fn(...args)
    4.         return (...arg) => judge(...args, ...arg)
    5.     }
    6.     return judge
    7. }
    10. function add(a, b, c) {
    11.     return a + b + c
    12. }
    13. add(1, 2, 3)
    14. let addCurry = curry(add)
    15. addCurry(1)(2)(3)