js implements a method similar to the add(1)(2)(3) calling method_javascript skills

Copy code The code is as follows:

var add = function(a){
Return function(b){
         return function(c){
               return a b c;
        };
};
};
add(1)(2)(3); //6

That’s right! If there are four calls like add(1)(2)(3)(4), then this will definitely not apply.

This is similar to executing a function and returning the value of the function itself:

Copy code The code is as follows:

function add(x) {
var sum = x;
var tmp = function (y) {
sum = sum y;
         return tmp;
};
tmp.toString = function () {
        return sum;
};
Return tmp;
}
console.log(add(1)(2)(3)); //6
console.log(add(1)(2)(3)(4)); //10

But after the calculation is completed, the tmp function is still returned, so the calculation result cannot be obtained. The result we need is a calculated number. So what should we do? First, we must know how to print and add calculations in JavaScript. , will call the toString or valueOf function respectively, so we rewrite the toString and valueOf methods of tmp to return the value of sum;

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