单页HTML 自出题指定范围内两个数值的加减乘练习

预期效果：
自定义指定范围内的两个数的加减乘出题，便于小学生进行加减乘法运算练习。
预期功能：
1.实现两个数值的加减乘运算练习；
2.可以选择加减乘运算；
3.可以指定本轮题目数量；
4.可以自定义每个数值的取值范围；
5.允许结果输入时，从右到左的输入；【需要勾选大数倒序输入】
（以便于多位数加法时，从低位到高位的依次计算）
6.统计正确率及用时秒数；
效果图示例如下：
代码如下：
<!DOCTYPE html>
<html>
 <head> 
  <title>Math</title> 
  <script>
var currentIndex = 0;
var totalCount = 0;
var rightCount = 0;

var numAStart = 0;
var numAEnd = 10;
var numBStart = 0;
var numBEnd = 10;
var opType = "+";
var usedSeconds = 0;
var startTime = 0;

var tempNumA = 0;
var tempNumB = 0;
var tempAnswer = 0;

var isRTL = false;


function fnStart(){
        document.getElementById("divSetting").style.display = "none";
        document.getElementById("divQuestionAnswer").style.display = "block";

        
        usedSeconds = 0;
        currentIndex = 0;
        numAStart = document.getElementById('txtNumAStart').value;

        numAEnd = document.getElementById("txtNumAEnd").value;
        numBStart = document.getElementById("txtNumBStart").value;
        numBEnd = document.getElementById("txtNumBEnd").value;
        totalCount = document.getElementById("txtQuestionsCount").value;
        rightCount = 0;
        
        var radios = document.getElementsByName("radOperationType");
        for(var i=0;i<radios.length;i++){
            if(radios[i].checked == true){
                opType = radios[i].value;
                break;
            }
        }
        
        
        startTime = new Date().getTime() ;

        if( document.getElementById("chkIsRTL").checked ){
            isRTL = true;
            document.getElementById("txtNumAnswer").style.display="none";
            document.getElementById("txtNumAnswerRTL").style.display="block";
        } else {
            isRTL = false;
            document.getElementById("txtNumAnswer").style.display="block";
            document.getElementById("txtNumAnswerRTL").style.display="none";
        }

    
        fnCreateQuestion();
}



function getRndInteger(min, max) {
    return Math.floor(Math.random() * (max - min + 1) ) + Math.floor(min);
}

function fnCreateQuestion(){
     if(currentIndex < totalCount){
        currentIndex = currentIndex + 1;
        
        tempNumA = getRndInteger(numAStart,numAEnd);
        tempNumB = getRndInteger(numBStart,numBEnd);
        
        if(opType == "+"){
            tempAnswer = tempNumA + tempNumB;
        } else if(opType == "-"){
            if(tempNumA < tempNumB){
                var tempN = tempNumA;
                tempNumA = tempNumB;
                tempNumB = tempN;
            }
            tempAnswer = tempNumA - tempNumB;
        } else if(opType == "x"){
            tempAnswer = tempNumA * tempNumB;
        }if(opType == "÷"){
            tempAnswer = tempNumA / tempNumB;
        }
        
        
        document.getElementById("divQuestionIndex").innerText = currentIndex + ".";
        document.getElementById("divNumA").innerText = tempNumA;
        document.getElementById("divNumB").innerText = tempNumB;
        document.getElementById("divOp").innerText = opType;
        
        if(isRTL){    
            document.getElementById("txtNumAnswerRTL").value = "";
            document.getElementById("txtNumAnswerRTL").focus();
        } else {
            document.getElementById("txtNumAnswer").value = "";
            document.getElementById("txtNumAnswer").focus();
        }
        
    
     } else {
        //all finish
        fnEnd();
     }
        
}

function fnNext() {

    var tempInputAnswer = document.getElementById("txtNumAnswer").value;
    
    if(isRTL){        
        tempInputAnswer = document.getElementById("txtNumAnswerRTL").value;
        var arr=tempInputAnswer.split("");
        var rever=arr.reverse();
        tempInputAnswer = rever.join("");
    } 
    
    if(tempInputAnswer == tempAnswer){
        rightCount = rightCount + 1;
    } else {
    
    }
    
    fnCreateQuestion();
    
}

function fnAfterInputAnswer(event){
        if(event.keyCode==13) {
            fnNext();
        }

}

function fnEnd(){
        var endTime =  new Date().getTime() ;
        var tempSeconds = Math.floor( (endTime - startTime)/1000 ) ; 
        
        var reportInfo = "题目数量: " + totalCount;
        reportInfo += "<br>\r\n正确数量: " + rightCount;
        reportInfo += "<br>\r\n用时秒数: " + tempSeconds;
        reportInfo += "<br>\r\n" ;
        reportInfo += "<br>\r\n分数： <span style='color:red'>" + Math.floor(( rightCount * 100 / totalCount)) + "%</span>";

        document.getElementById("divResult").innerHTML = reportInfo;
        
    
        document.getElementById("divSetting").style.display = "none";
        document.getElementById("divQuestionAnswer").style.display = "none";
        document.getElementById("divResultReport").style.display = "block";
        

}

function fnReStart(){
        document.getElementById("divSetting").style.display = "block";
        document.getElementById("divQuestionAnswer").style.display = "none";
        document.getElementById("divResultReport").style.display = "none";
}



</script> 
 </head> 
 <body> 
  <form> 
  
  
   <div id="divSetting" style="display:block; width:325px; padding:5px;border:1px solid green;">
     数字A 范围: 
    <br /> 
    <input type="text" id="txtNumAStart" value="0" style="width:80px;" /> - 
    <input type="text" id="txtNumAEnd" value="10" style="width:80px;" /> 
    <br /> 数字B 范围: 
    <br /> 
    <input type="text" id="txtNumBStart" value="0" style="width:80px;" /> - 
    <input type="text" id="txtNumBEnd" value="10" style="width:80px;" /> 
    <br /> 运算符: 
    <br /> 
    <input type="radio" name="radOperationType" value="+" checked="" /> 
    <span>加法+</span> 
    <input type="radio" name="radOperationType" value="-" /> 
    <span>减法-</span> 
    <input type="radio" name="radOperationType" value="x" /> 
    <span>乘法x</span> 
    <input type="radio" name="radOperationType" value="&divide;" /> 
    <span>除法&divide;</span> 
    <br /> 题目数量: 
    <br /> 
    <input type="text" id="txtQuestionsCount" value="10" style="width:80px;" /> 
    <br /> 单题限时: 
    <br /> 
    <input type="text" id="txtSingleLimitSeconds" value="10" style="width:80px;" />(秒） 
    <br /> 
    <input type="checkbox" id="chkIsRTL" name="chkIsRTL" value="" />大数倒序输入 
    <br /> 
    <br /> 
    <input type="button" onclick="fnStart()" id="btnStart" value="start 开始" style="margin-left:100px; font-size:30px;" /> 
   </div> 
   
   
   <div id="divQuestionAnswer" style="display:none;width:325px; padding:5px;border:1px solid green;"> 
    <div id="divQuestionIndex">
      1. 
    </div> 
    <table style="font-size:36pt; letter-spacing:8px; width:100px; background-color:gray;"> 
     <tbody> 
      <tr> 
       <td style="width:60px;"> </td> 
       <td style="width:100px"></td> 
      </tr> 
      <tr> 
       <td></td> 
       <td> 
        <div id="divNumA" style="text-align:right; background-color:gray; width:200px;">
          0 
        </div> </td> 
      </tr> 
      <tr> 
       <td> 
        <div id="divOp" style="background-color:gray; display:inline;">
          + 
        </div> </td> 
       <td> 
        <div id="divNumB" style="background-color:gray;text-align:right;width:200px;">
          0 
        </div> </td> 
      </tr> 
      <tr> 
       <td colspan="2"> 
        <div id="divHr" style=" height:10px;"> 
         <hr /> 
        </div> </td> 
      </tr> 
      <tr> 
       <td colspan="2" style="text-align:right"> <input type="text" id="txtNumAnswer" onkeyup="fnAfterInputAnswer(event)" style=" height:40px;font-size:36pt;text-align:right;letter-spacing:8px;width:310px;" value="" /> <input type="text" id="txtNumAnswerRTL" onkeyup="fnAfterInputAnswer(event)" style=" height:40px;font-size:36pt;text-align:right;letter-spacing:8px;width:310px;direction: rtl;unicode-bidi: bidi-override;" value="" /> </td> 
      </tr> 
      <tr> 
       <td colspan="2"> <input type="button" onclick="fnEnd()" id="btnEnd" value="完成" /> <input type="button" onclick="fnNext()" id="btnEnd" value=" Enter下一题 " style="margin-left:20px;  font-size:30px;" /> </td> 
      </tr> 
     </tbody> 
    </table> 
   </div> 
   
   
   <div id="divResultReport" style="display:none;width:325px; padding:5px;border:1px solid green;"> 
    <div id="divResult"> 
    </div> 
    <br /> 
    <input type="button" onclick="fnReStart()" id="btnReStart" value="restart 重新开始" style="margin-left:50px; font-size:30px;" /> 
    <br>
    <br>
    <div style="text-align:center">
        <a href="http://www.cnblogs.com/freeliver54" target="_blank">edit by freeliver54</a>
    </div>
   </div> 
   
   
  </form>  
 </body>
</html>
View Code
来源：oschina
链接：https://my.oschina.net/u/4347381/blog/3220628
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