JavaScript基础实例:如何计算24点(3)

n[3] = document.forms[0].fd.value;
if ( n[0] > 0 && n[1] > 0 && n[2] > 0 && n[3] > 0 && n[0] < 14 && n[1] < 14 && n[2] < 14 && n[3] < 14 )
{
log("

1<font size="5"><b>"+n[0]+", "+n[1]+", "+n[2]+", "+n[3]+"的24点答案：</b></font>

1<br/>

");
log("

1<input onclick="history.back(-1);" type="button" value=" 再来一次 "/>

1<br/>

");
funMain();
if ( counter == 0 )
{
log("没有答案！");
}
}
else
{
alert("输入错误！");
}
}

//主程序
function funMain()
{
var m = new Array();
//四种运算符
m[0] = "+";
m[1] = "-";
m[2] = "*";
m[3] = "/";

//11种表达式
var exp1 = "a m1 b m2 c m3 d;";
var exp2 = "(a m1 b) m2 c m3 d;";
var exp3 = "(a m1 b m2 c) m3 d;";
var exp4 = "((a m1 b) m2 c) m3 d;";
var exp5 = "(a m1 (b m2 c)) m3 d;";
var exp6 = "a m1 (b m2 c) m3 d;";
var exp7 = "a m1 (b m2 c m3 d);";
var exp8 = "a m1 ((b m2 c) m3 d);";