js实现随机的四则运算题目效果

2019-10-27 17:59:57

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本文主要介绍了随机的四则运算题目，这样就可以自动的生成随机的30个四则运算题目了。可以生成随机的四则运算题目给给小学生用，但是还是有问题，小学生啊！他们不知道负数，不知道小数。所以还要加入判定条件。具体代码如下：

switch(Arr[n]){    case "+":{    sum=a+b;    break;    }    case "-":{    sum=a-b;    while(sum<0){     var a = GetRandomNum(1,30);     var b = GetRandomNum(1,30);     sum=a-b;    }    break;    }    case "*":{    sum=a*b;    break;    }    case "/":{    sum=a/b;    while(hasDot(sum)){      var a = GetRandomNum(1,100);      var b = GetRandomNum(1,100);      sum=a/b;     }    break;    }

这样负数和小数都没有了。

不过，小学生貌似会分数的运算。于是我又开始试试写分数的。

<body> <button class="btn btn-success btn-sm" type='button' onclick="pl_f()">开始生成题目</button> <span id="text_f"></span> <script> function GetRandomNum(Min,Max) {   var Range = Max - Min;   var Rand = Math.random();   return(Min + Math.round(Rand * Range));  } function max_num(x,y) {  var t;  while (y) {   t = x%y;   x = y;   y = t;  }  return x; } function fenshu(a,b,p) {  if (p==1) {   if (a>b) {    return a+"/"+b;   }else if(a<b){    return a+"/"+b;   }else {    return 1;   }  }else {   var x=a/p;   var y=b/p;   if(y==1){    return x;   }else{    return x+"/"+y;   }  } }  function pl_f() {  var son_a = GetRandomNum(1,30);   var par_b = GetRandomNum(1,30);  var son_c = GetRandomNum(1,30);   var par_d = GetRandomNum(1,30);   var X=son_a+"/"+par_b;  var Y=son_c+"/"+par_d;  document.write("第一个分数："+X+"<br>");  document.write("第二个分数"+Y+"<br>");  max_x=max_num(son_a,par_b);  max_y=max_num(son_c,par_d);  document.write("第一个最大公约数"+max_x+"<br>");  document.write("第二个最大公约数"+max_y+"<br>");  var N=fenshu(son_a,par_b,max_x);  var M=fenshu(son_c,par_d,max_y);  document.write("第一个分数化简："+N+"<br>");  document.write("第二个分数化简"+M); } </script> </body>

这个可以动态的生成两个分数，然后输出这个分数分子和分母的最大公约数。最后输出分子的最简式。

最后就是将分数放入整数一起了!

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml"> <head> <title> new document </title> <meta http-equiv="Content-Type" content="text/html; charset=utf-8"> <meta name="generator" content="editplus" /> <meta name="author" content="" /> <meta name="keywords" content="" /> <meta name="description" content="" /> </head> <body> <button type='button' onclick="play_all()">开始生成题目</button> <span id="text"></span> </body> <script> function GetRandomNum(Min,Max) {   var Range = Max - Min;   var Rand = Math.random();   return(Min + Math.round(Rand * Range));  } function max_num(x,y) {  var t;  while (y) {   t = x%y;   x = y;   y = t;  }  return x; } function fenshu(a,b,p) {  if (p==1) {   if (a>b) {    return a+"/"+b;   }else if(a<b){    return a+"/"+b;   }else {    return 1;   }  }else {   var x=a/p;   var y=b/p;   if(y==1){    return x;   }else{    return x+"/"+y;   }  } } function f_count(a,b,c,d) {   var Arr = ["+","-","*","/"];    var n = GetRandomNum(0,3);   switch(Arr[n]){    case "+":{    var sum_x=(a*d)+(b*c);    var sum_y=b*d;    max_x=max_num(sum_x,sum_y);    max_y=max_num(sum_x,sum_y);    var N=fenshu(sum_x,sum_y,max_x);    return a+"/"+b+"+"+c+"/"+d+"="+N;    break;    }    case "-":{    var sum_x=(a*d)-(b*c);     while (sum_x<0) {      var a = GetRandomNum(1,30);       var b = GetRandomNum(1,30);      var c = GetRandomNum(1,30);       var d = GetRandomNum(1,30);      var sum_x=(a*d)-(b*c);     }    var sum_y=b*d;    max_x=max_num(sum_x,sum_y);    max_y=max_num(sum_x,sum_y);    var N=fenshu(sum_x,sum_y,max_x);    return a+"/"+b+"-"+c+"/"+d+"="+N;    break;    }    case "*":{    var sum_x=a*c;    var sum_y=b*d;    max_x=max_num(sum_x,sum_y);    max_y=max_num(sum_x,sum_y);    var N=fenshu(sum_x,sum_y,max_x);    return a+"/"+b+"*"+c+"/"+d+"="+N;    break;    }    case "/":{    var sum_x=a*d;    var sum_y=b*c;    max_x=max_num(sum_x,sum_y);    max_y=max_num(sum_x,sum_y);    var N=fenshu(sum_x,sum_y,max_x);    return a+"/"+b+"÷"+c+"/"+d+"="+N;    break;    }   } } function count(a,b){   var Arr = ["+","-","*","/"];    var n = GetRandomNum(0,3);   switch(Arr[n]){    case "+":{    var sum=a+b;    return a+"+"+b+"="+sum;    break;    }    case "-":{    var sum=a-b;    while(sum<0){     var a = GetRandomNum(1,30);     var b = GetRandomNum(1,30);     var sum=a-b;    }    return a+"-"+b+"="+sum;    break;    }    case "*":{    var sum=a*b;    return a+"*"+b+"="+sum;    break;    }    case "/":{    var sum=a/b;    while(a%b!==0){     var max_x=max_num(a,b);     var N=fenshu(a,b,max_x);     return a+"÷"+b+"="+N;    }    return a+"÷"+b+"="+sum;    break;    }   } } function pl_f() {  var son_a = GetRandomNum(1,30);   var par_b = GetRandomNum(1,30);  var son_c = GetRandomNum(1,30);   var par_d = GetRandomNum(1,30);  var suma=f_count(son_a,par_b,son_c,par_d);  return suma; } function pl() {   var a = GetRandomNum(1,30);    var b = GetRandomNum(1,30);   var sumb=count(a,b);   return sumb; } function play_all() {   for (i = 1; i <=30; i++) {    var a = GetRandomNum(0,1);    document.getElementById("text").innerHTML+=("<br>"+"第"+i+"题：");    switch (a) {     case 0:      var A=pl();      document.getElementById("text").innerHTML+=(A);      break;     case 1:      var B=pl_f();      document.getElementById("text").innerHTML+=(B);      break;    }   } } </script></html>

执行完节目就成这样的啦

js随机四则运算,js四则运算,js实现四则运算

最后上个答案和题目分开的版本！

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml"> <head> <title> new document </title> <meta http-equiv="Content-Type" content="text/html; charset=utf-8"> <meta name="generator" content="editplus" /> <meta name="author" content="" /> <meta name="keywords" content="" /> <meta name="description" content="" /> </head> <body> <button type='button' onclick="play_all()">开始生成题目</button> <span id="text"></span> <span id="text2"></span> </body> <script> function GetRandomNum(Min,Max) {   var Range = Max - Min;   var Rand = Math.random();   return(Min + Math.round(Rand * Range));  } function max_num(x,y) {  var t;  while (y) {   t = x%y;   x = y;   y = t;  }  return x; } function fenshu(a,b,p) {  if (p==1) {   if (a>b) {    return a+"/"+b;   }else if(a<b){    return a+"/"+b;   }else {    return 1;   }  }else {   var x=a/p;   var y=b/p;   if(y==1){    return x;   }else{    return x+"/"+y;   }  } } function f_count(a,b,c,d) {   var Arr = ["+","-","*","/"];    var n = GetRandomNum(0,3);   switch(Arr[n]){    case "+":{    var sum_x=(a*d)+(b*c);    var sum_y=b*d;    max_x=max_num(sum_x,sum_y);    max_y=max_num(sum_x,sum_y);    var N=fenshu(sum_x,sum_y,max_x);    return a+"/"+b+"+"+c+"/"+d+"="+N;    break;    }    case "-":{    var sum_x=(a*d)-(b*c);     while (sum_x<0) {      var a = GetRandomNum(1,30);       var b = GetRandomNum(1,30);      var c = GetRandomNum(1,30);       var d = GetRandomNum(1,30);      var sum_x=(a*d)-(b*c);     }    var sum_y=b*d;    max_x=max_num(sum_x,sum_y);    max_y=max_num(sum_x,sum_y);    var N=fenshu(sum_x,sum_y,max_x);    return a+"/"+b+"-"+c+"/"+d+"="+N;    break;    }    case "*":{    var sum_x=a*c;    var sum_y=b*d;    max_x=max_num(sum_x,sum_y);    max_y=max_num(sum_x,sum_y);    var N=fenshu(sum_x,sum_y,max_x);    return a+"/"+b+"*"+c+"/"+d+"="+N;    break;    }    case "/":{    var sum_x=a*d;    var sum_y=b*c;    max_x=max_num(sum_x,sum_y);    max_y=max_num(sum_x,sum_y);    var N=fenshu(sum_x,sum_y,max_x);    return a+"/"+b+"÷"+c+"/"+d+"="+N;    break;    }   } } function count(a,b){   var Arr = ["+","-","*","/"];    var n = GetRandomNum(0,3);   switch(Arr[n]){    case "+":{    var sum=a+b;    return a+"+"+b+"="+sum;    break;    }    case "-":{    var sum=a-b;    while(sum<0){     var a = GetRandomNum(1,30);     var b = GetRandomNum(1,30);     var sum=a-b;    }    return a+"-"+b+"="+sum;    break;    }    case "*":{    var sum=a*b;    return a+"*"+b+"="+sum;    break;    }    case "/":{    var sum=a/b;    while(a%b!==0){     var max_x=max_num(a,b);     var N=fenshu(a,b,max_x);     return a+"÷"+b+"="+N;    }    return a+"÷"+b+"="+sum;    break;    }   } } function pl_f() {  var son_a = GetRandomNum(1,30);   var par_b = GetRandomNum(1,30);  var son_c = GetRandomNum(1,30);   var par_d = GetRandomNum(1,30);  var suma=f_count(son_a,par_b,son_c,par_d);  return suma; } function pl() {   var a = GetRandomNum(1,30);    var b = GetRandomNum(1,30);   var sumb=count(a,b);   return sumb; } function play_all() {   for (i = 1; i <=30; i++) {    var a = GetRandomNum(0,1);    document.getElementById("text").innerHTML+=("<br>"+"第"+i+"题：");    switch (a) {     case 0:      var A=pl();      var strs = A.split("=");      document.getElementById("text").innerHTML+=(strs[0]+"="+"<br>");      document.getElementById("text2").innerHTML+=("<br>"+"第"+i+"题答案："+strs[1]);      break;     case 1:      var B=pl_f();      var strs = B.split("=");      document.getElementById("text").innerHTML+=(strs[0]+"="+"<br>");      document.getElementById("text2").innerHTML+=("<br>"+"第"+i+"题答案："+strs[1]);      break;    }   } } </script></html>

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