JS implementation is similar to the Add (1) (2) (3) method of calling methods _javascript tips

Copy Code code 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 the Add (1) (2) (3) (4) has such 4 calls, then this certainly does not apply.

This is analogous to performing a function return function itself value:

Copy Code code 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 completion of the calculation or return the function of TMP, so that we can not get the result of the calculation, we need the result is a calculated number how to do it, first of all to know in JavaScript, print and add calculation, will call the ToString or valueof function, So we rewrite the ToString and valueof methods of TMP to return the value of sum;

The above is the entire content of this article, I hope you can enjoy.