Calculate the 24-point JavaScript code

24: 00 game introduction:
Four integers between 1 and 9 are given. Each digit can only be used once. Any +-*/() is used to construct an expression, and the final result is 24, this is a common 24-point game. The number range of the Code provided in this article is not limited to 1-9, the number is not limited to 4, the type is not an integer, the result can also be specified, not limited to 24. However, as the number of digits increases or the number size increases, the longer it takes.

1 AR opts = ["+", "*", "-", "-", "/", "/"];
2 function process (Nums, Len, aim)
3 {
4 For (VAR I = 0; I <Len; I ++ ){
5 For (var j = I + 1; j <Len; j ++ ){
6 var numij = [Nums [I], Nums [J];
7 Nums [J] = Nums [Len-1];
8 For (var k = 0; k <6; k ++ ){
9 Nums [I] = '(' + numij [K % 2] + opts [k] + numij [(! (K % 2) * 1)] + ')';
10 if (process (Nums, len-1, aim )){
11 return true;
12}
13}
14 Nums [I] = numij [0];
15 Nums [J] = numij [1];
16}
17}
18 return (LEN = 1) & (math. Abs (new function ("return" + Nums [0]) ()-aim) <0.0000001 );
19}

The above 10 lines of code have completed 24-point calculation. If a 24-point expression can be calculated, true is returned and the expression is saved in Nums [0, if the given number cannot be found and the 24-point expression can be calculated, false is returned. The following function is used to obtain the correct expression or give a prompt that the calculation is not possible.

Function getexp (aim, Nums ){
If (process (Nums, Nums. length, aim )){
Return Nums [0]. substring (1, Nums [0]. Length-1 );
} Else {
Return "no expression =" + aim;
}
}

You can write your own HTML test, or download it here: http://files.cnblogs.com/JoeDZ/game24.rar, but here there is a limit on the input, only an integer can be entered.