1     public String generateQuestion(int numOfOperand, int rangeMin, int rangMax, boolean isInt, 2             SupportedOperation[] operation, boolean bracket) { 3         String question = ""; 4         int[] ioperands = null; 5         double[] doperands = null; 6         SupportedOperation[] so = null; 7         if (numOfOperand < 2) { 8             System.out.println("操作数数量至少为2"); 9             return "";10         }11         if (rangMax > 500) {12             System.out.println("操作数数最大值不能超过500");13             return "";14         }15         if (isInt) {16             ioperands = new int[numOfOperand];17             for (int i = 0; i < numOfOperand; i++) {18                 ioperands[i] = (int) (Math.random() * rangMax / 2 +1);19             20             }21             question += ioperands[0];22             //int sub = ioperands[0];23             so = new SupportedOperation[numOfOperand-1];24             for(int i = 0;i < operation.length;i++){25                 if(operation[i] == SupportedOperation.ALL){26                     operation = new SupportedOperation[4];27                     operation[0] = SupportedOperation.ADD;28                     operation[1] = SupportedOperation.MINUS;29                     operation[2] = SupportedOperation.MULTIPLY;30                     operation[3] = SupportedOperation.DIVIDE;31                     32                 }33             }34             int value = http://www.mamicode.com/0;35             for(int j = 0;j<numOfOperand-1;j++){36                 37                 so[j] = operation[(int)(Math.random()*operation.length)];38                 switch(so[j]){39                 case ADD:question = ioperands[j+1]+"+"+question;break;40                 case MINUS:question = ioperands[j+1]+"-"+question;break;41                 case MULTIPLY:question = ioperands[j+1]+"*"+question;break;42                 case DIVIDE:{43                     if(value < 1){44                         ioperands[j+1] = ioperands[j+1]*ioperands[j];45                         question =ioperands[j+1]+"/"+question;46                         47                         value++;48                     }49                     else{50                         j--;51                     }52                 }break;53                 default:System.out.println("sb");break;54                 }55             }56             System.out.println(question);57             ScriptEngine se = new ScriptEngineManager().getEngineByName("JavaScript");58             59             try {60                 Integer d = (Integer) se.eval(question);61                 System.out.println(d);62             } catch (ScriptException e) {63                 e.printStackTrace();64             }65             66         } else {67             doperands = new double[numOfOperand];68             for (int i = 0; i < numOfOperand; i++) {69                 doperands[i] = Math.random() * rangMax / 2;70             }71         }72 73         return question;74 75     }

 1 <script type="text/javascript"> 2         function compute() { 3  4             for (var i = 1; i <= 20; i++) { 5                 var a = "" + eval(document.getElementById("q" + i).innerHTML); 6                 var auser = document.getElementById("a" + i).value; 7                 if (a == auser) { 8                     document.getElementById("r" + i).innerHTML = "正确"; 9                 } else {10                     document.getElementById("r" + i).innerHTML = "错误";11                 }12             }13 14         }15     </script>