implement a sum method to make it behave as follows
sum(2,3).valueOf() //5
sum(2,3,4).valueOf() //9
sum(2,3)(4).valueOf() //9
sum(2,3,4)(2)(3,4).valueOf() //18 the previous parts sum () , sum () () are easy to say. But how do you rewrite valueOf to print the sum of the data returned by the previous execution method?
sum () can continue to use the () operator, indicating that sum () returns a function (function / function expression / arrow function collectively); in addition, the return value also has a valueOf () method, so you can put a box
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