http://community.csdn.net/Expert/topic/3735/3735144.xml?temp=8.680362E-02
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html> <head> <title>Javascript版 v1.0</title> <META HTTP-EQUIV="REFRESH" CONTENT=10; URL=*.*> <meta http-equiv="Content-Type" content="text/html; charset=GB2312"> </head>
<body> <br> 计算24点(加、减、乘、除、括号) Javascript版 v1.0<br><br> <br><br><br><br> <form> <div align=center> 时间限制(10秒)<br><br> <input type="text" name="fa" value="<%=l1%>" size="10"> <input type="text" name="fb" value="<%=l2%>" size="10"> <input type="text" name="fc" value="<%=l3%>" size="10"> <input type="text" name="fd" value="<%=l4%>" size="10"> <br><br><input type="button" name="btn" onclick="javascript:funCount()" value="查看答案 ">
</div></form>
<script language="JavaScript"> function log(str) { document.write("<br>"+str); }
//生成计算表达式 function genExpress(exp,a,b,c,d,m1,m2,m3) { var exp=exp.replace("a",a); exp=exp.replace("b",b); exp=exp.replace("c",c); exp=exp.replace("d",d); exp=exp.replace("m1",m1); exp=exp.replace("m2",m2); exp=exp.replace("m3",m3); return exp; }
var answer = new Array();//正确答案的表达式 var counter = 0;//答案的个数
//测试表达式是否正确 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+": "+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[1] = document.forms[0].fb.value; n[2] = document.forms[0].fc.value; 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("<font size=5><b>"+n[0]+", "+n[1]+", "+n[2]+", "+n[3]+"的24点答案:</b></font><br>"); log("<input type='button' onclick='history.back(-1);' value=' 再来一次 '><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);"; var exp9 = "a m1 (b m2 (c m3 d));"; var exp10 = "a m1 b m2(c m3 d);"; var exp11 = "(a m1 b) m2 (c m3 d);"; var a,b,c,d;//四个数字 var m1,m2,m3;//三个运算符 for (var i=0;i<4;i++) { a = n[i]; for (var j=0;j<4;j++) { if ( i == j )j++;//从未选的三个数字中选择一个数字 if(j>3)break; b = n[j]; for (var x=0;x<4;x++) { if(i>j){max=i;min=j}else{max=j;min=i} if(x==min)x++; if (x==max)x++;//从未选的两个数字中选择一个数字 if(x>3)break; c = n[x]; for (var y=0;y<4;y++) { if(i>j){if(x>i){max=x;mid=i;min=j}else{if(x>j){max=i;mid=x;min=j}else{max=i;mid=j;min=x}}} else{if(x>j){max=x;mid=j;min=i}else{if(x>i){max=j;mid=x;min=i}else{max=j;mid=i;min=x}}} if(min==y)y++; if(mid==y)y++; if ( max == y ) y++;//从未选的一个数字中选择一个数字 if(y>3)break; d = n[y]; for (var ta=0;ta<4;ta++) { m1 = m[ta]; for (var tb=0;tb<4;tb++) { m2 = m[tb]; for (var tc=0;tc<4;tc++) { m3 = m[tc]; for (var k=1;k<12;k++) { eval("test(exp"+k+",a,b,c,d,m1,m2,m3);"); } } } } } } } } } </script> </body>
</html>

|