简单应用：利用高阶函数在不改变原有函数逻辑的情况下，插入函数

    1. //highOrderFunction.js
    2. const core = (argsA, argsB, argsC) => {
    3.   console.log(argsA, argsB, argsC)
    4. }
    6. Function.prototype.insertBefore = function (callFunc) {
    7.   return (...args) => {
    8.     callFunc()
    9.     this(...args)
    10.   }
    11. }
    12. const insertBeforeFunc = core.insertBefore(() => {
    13.   console.log('before call')
    14. })
    15. insertBeforeFunc('a', 'b', 'c')
    16. // before call
    17. // a b c