4个数字的混合运算得固定结果的可能性

function all_r(num1, num2, num3, num4) {
s = ["+", "-", "*", "/"];
n = [];
for (i=0; i<4; i++) {
temp1 = num1+s[i]+num2;
for (j=0; j<4; j++) {
temp2 = temp1+s[j]+num3;
for (k=0; k<4; k++) {
temp3 = temp2+s[k]+num4;
n.push(temp3);
}
}
}
}
function Result(num1, num2, num3, num4, r) {
kong = false;
all_r(num1, num2, num3, num4);
var result_arr = [];
var result;
var num = 0;
for (z=0; z<n.length; z++) {
for (i=0; i<n[z].length; i++) {
num1_len = new String(num1).length;
num2_len = new String(num2).length;
num3_len = new String(num3).length;
m1 = n[z].substr(num1_len, 1);
m2 = n[z].substr(num1_len+num2_len+1, 1);
m3 = n[z].substr(num1_len+num2_len+num3_len+2, 1);
if (m1 == "+" and m2 == "+" and m3 == "+") {
result = Number(num1)+Number(num2)+Number(num3)+Number(num4);
}
if (m1 == "+" and m2 == "+" and m3 == "-") {
result = Number(num1)+Number(num2)+Number(num3)-num4;
}
if (m1 == "+" and m2 == "+" and m3 == "*") {
result = Number(num1)+Number(num2)+num3*num4;
}
if (m1 == "+" and m2 == "+" and m3 == "/") {
result = Number(num1)+Number(num2)+num3/num4;
}
//------------------------------
if (m1 == "+" and m2 == "-" and m3 == "+") {
result = Number(num1)+Number(num2)-num3+Number(num4);
}
if (m1 == "+" and m2 == "-" and m3 == "-") {
result = Number(num1)+Number(num2)-num3-num4;
}
if (m1 == "+" and m2 == "-" and m3 == "*") {
result = Number(num1)+Number(num2)-num3*num4;
}
if (m1 == "+" and m2 == "-" and m3 == "/") {
result = Number(num1)+Number(num2)-num3/num4;
}
//-----------------------------
if (m1 == "+" and m2 == "*" and m3 == "+") {
result = Number(num1)+num2*num3+Number(num4);
}
if (m1 == "+" and m2 == "*" and m3 == "-") {
result = Number(num1)+num2*num3-num4;
}
if (m1 == "+" and m2 == "*" and m3 == "*") {
result = Number(num1)+num2*num3*num4;
}
if (m1 == "+" and m2 == "*" and m3 == "/") {
result = Number(num1)+num2*num3/num4;
}
//------------------------
if (m1 == "+" and m2 == "/" and m3 == "+") {
result = Number(num1)+num2/num3+Number(num4);
}
if (m1 == "+" and m2 == "/" and m3 == "-") {
result = Number(num1)+num2/num3-num4;
}
if (m1 == "+" and m2 == "/" and m3 == "*") {
result = Number(num1)+num2/num3*num4;
}
if (m1 == "+" and m2 == "/" and m3 == "/") {
result = Number(num1)+num2/num3/num4;
}
//------------------------
if (m1 == "-" and m2 == "+" and m3 == "+") {
result = num1-num2+Number(num3)+Number(num4);
}
if (m1 == "-" and m2 == "+" and m3 == "-") {
result = num1-num2+Number(num3)-num4;
}
if (m1 == "-" and m2 == "+" and m3 == "*") {
result = num1-num2+num3*num4;
}
if (m1 == "-" and m2 == "+" and m3 == "/") {
result = num1-num2+num3/num4;
}
//----------------------------------
if (m1 == "-" and m2 == "-" and m3 == "+") {
result = num1-num2-num3+Number(num4);
}
if (m1 == "-" and m2 == "-" and m3 == "-") {
result = num1-num2-num3-num4;
}
if (m1 == "-" and m2 == "-" and m3 == "*") {
result = num1-num2-num3*num4;
}
if (m1 == "-" and m2 == "-" and m3 == "/") {
result = num1-num2-num3/num4;
}
//----------------------------
if (m1 == "-" and m2 == "*" and m3 == "+") {
result = num1-num2*num3+Number(num4);
}
if (m1 == "-" and m2 == "*" and m3 == "-") {
result = num1-num2*num3-num4;
}
if (m1 == "-" and m2 == "*" and m3 == "*") {
result = num1-num2*num3*num4;
}
if (m1 == "-" and m2 == "*" and m3 == "/") {
result = num1-num2*num3/num4;
}
//------------------------------
if (m1 == "-" and m2 == "/" and m3 == "+") {
result = num1-num2/num3+Number(num4);
}
if (m1 == "-" and m2 == "/" and m3 == "-") {
result = num1-num2/num3-num4;
}
if (m1 == "-" and m2 == "/" and m3 == "*") {
result = num1-num2/num3*num4;
}
if (m1 == "-" and m2 == "/" and m3 == "/") {
result = num1-num2/num3/num4;
}
//--------------------------------
if (m1 == "*" and m2 == "+" and m3 == "+") {
result = num1*num2+Number(num3)+Number(num4);
}
if (m1 == "*" and m2 == "+" and m3 == "-") {
result = num1*num2+Number(num3)-num4;
}
if (m1 == "*" and m2 == "+" and m3 == "*") {
result = num1*num2+num3*num4;
}
if (m1 == "*" and m2 == "+" and m3 == "/") {
result = num1*num2+num3/num4;
}
//---------------------------------
if (m1 == "*" and m2 == "-" and m3 == "+") {
result = num1*num2-num3+Number(num4);
}
if (m1 == "*" and m2 == "-" and m3 == "-") {
result = num1*num2-num3-num4;
}
if (m1 == "*" and m2 == "-" and m3 == "*") {
result = num1*num2-num3*num4;
}
if (m1 == "*" and m2 == "-" and m3 == "/") {
result = num1*num2-num3/num4;
}
//----------------------------------
if (m1 == "*" and m2 == "*" and m3 == "+") {
result = num1*num2*num3+Number(num4);
}
if (m1 == "*" and m2 == "*" and m3 == "-") {
result = num1*num2*num3-num4;
}
if (m1 == "*" and m2 == "*" and m3 == "*") {
result = num1*num2*num3*num4;
}
if (m1 == "*" and m2 == "*" and m3 == "/") {
result = num1*num2*num3/num4;
}
//---------------------------------
if (m1 == "*" and m2 == "/" and m3 == "+") {
result = num1*num2/num3+Number(num4);
}
if (m1 == "*" and m2 == "/" and m3 == "-") {
result = num1*num2/num3-num4;
}
if (m1 == "*" and m2 == "/" and m3 == "*") {
result = num1*num2/num3*num4;
}
if (m1 == "*" and m2 == "/" and m3 == "/") {
result = num1*num2/num3/num4;
}
//----------------------------------
if (m1 == "/" and m2 == "+" and m3 == "+") {
result = num1/num2+Number(num3)+Number(num4);
}
if (m1 == "/" and m2 == "+" and m3 == "-") {
result = num1/num2+Number(num3)-num4;
}
if (m1 == "/" and m2 == "+" and m3 == "*") {
result = num1/num2+num3*num4;
}
if (m1 == "/" and m2 == "+" and m3 == "/") {
result = num1/num2+num3/num4;
}
//----------------------------------
if (m1 == "/" and m2 == "-" and m3 == "+") {
result = num1/num2-num3+Number(num4);
}
if (m1 == "/" and m2 == "-" and m3 == "-") {
result = num1/num2-num3-num4;
}
if (m1 == "/" and m2 == "-" and m3 == "*") {
result = num1/num2-num3*num4;
}
if (m1 == "/" and m2 == "-" and m3 == "/") {
result = num1/num2-num3/num4;
}
//-----------------------------------
if (m1 == "/" and m2 == "*" and m3 == "+") {
result = num1/num2*num3+Number(num4);
}
if (m1 == "/" and m2 == "*" and m3 == "-") {
result = num1/num2*num3-num4;
}
if (m1 == "/" and m2 == "*" and m3 == "*") {
result = num1/num2*num3*num4;
}
if (m1 == "/" and m2 == "*" and m3 == "/") {
result = num1/num2*num3/num4;
}
//---------------------------------
if (m1 == "/" and m2 == "/" and m3 == "+") {
result = num1/num2/num3+Number(num4);
}
if (m1 == "/" and m2 == "/" and m3 == "-") {
result = num1/num2/num3-num4;
}
if (m1 == "/" and m2 == "/" and m3 == "*") {
result = num1/num2/num3*num4;
}
if (m1 == "/" and m2 == "/" and m3 == "/") {
result = num1/num2/num3/num4;
}
//---------------------------------
}
if (result == r and r != "") {
num++;
trace(n[z]);
}
}
for (i=0; i<5; i++) {
if (this["n"+i].text == "") {
kong = true;
}
}
if (kong) {
trace("请填完整的数字");
}
if (!num) {
trace("没有找到这样的组合");
}
} Result(3,3,3,3,9) //这里前四个数字分别填入待进行混合运算的因子，最后一个填入希望通过计算得到的结果