function test(expn,a,b,c,d,m1,m2,m3)
{
  var exp;
  var ret;
  exp = genExpress(expn,a,b,c,d,m1,m2,m3);//生成计算表达式
  eval("ret = "+exp);
  if ( ret - 24 < 0.1 && ret - 24 >= 0 )
  {
   exp = exp.replace(";","");
   exp = replaceAll(exp,"*","×");
   exp = replaceAll(exp, "/","÷");
   var have = false;
   for ( var i=0; i<counter; i++)
   {
  if ( exp == answer[i] )
   {
  have = true;
  break;
}
   }
   if ( !have )
   {
answer[counter] = exp;
counter++;
log("<font color=red><b>"+counter+":&nbsp;&nbsp;"+exp+"</b></font>");
   }

}
}

function replaceAll (streng, soeg, erstat)
{
  var st = streng;
  if (soeg.length == 0)
   return st;
  var idx = st.indexOf(soeg);
  while (idx >= 0) 
  { 
   st = st.substring(0,idx) + erstat + st.substr(idx+soeg.length);
   idx = st.indexOf(soeg);
  }
  return st;
}

var n = new Array();//四个数字

//接收四个输入框的数字，调用主程序
function funCount()
{
  n[0] = document.forms[0].fa.value;
  n = document.forms[0].fb.value;
  n = document.forms[0].fc.value;