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console 命令行工具 X clear 

                    

                        
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console

            
						var rightNum = 0;
            var wrongNum = 0;
            var count = 0;
            var num1;
            var num2;

            randomQuestion();
 
            function randomQuestion(){
            	if(count > 9){
                    if(count <= 10){
                        res();
                         document.getElementById("xs").innerHTML="总分："+rightNum*10+"\n<br/>答错"+wrongNum+"题";
                     
                    }
                    count++;
                    return;
               }else if(count > 0){
                    res();
                }

                num1 =parseInt(Math.random()*30);
                num2 = parseInt(Math.random()*30);
                question.innerText = num1+'+'+num2;
                count++;
                title.innerText = "第"+count+"题";
                answer.value = "";
            
            	}

 
            function res(){
                var result;
                result= num1 + num2;
                if(parseFloat(answer.value) == parseFloat(result)){
                    rightNum++;
                    document.getElementById("xs").innerHTML="正确";
                }else{
                    wrongNum++;
                    document.getElementById("xs").innerHTML="错误";
                }
            }

            
 <body>
   <div class="top" style="height:70px;border-bottom:1px solid #ddd;">
<img class="logoIndex" height="60" src="https://www.zenitour.com/img/logoIndex.png" style="margin-left:10px;margin-top:5px;">
</div>
   <div class="content" style="text-align:center; margin-top:50px;height: 78%;">
        <table style="margin-left:40%;">
            <tr><td colspan="4"><label id="title" /></td>
            <tr>
                <td><label id="question"  /></td>
                <td>=</td>
                <td><input id="answer"  /></td>
                <td><button  onclick="randomQuestion()">确定</button></td>
            
        </table>
     <p id="xs"></p>
   </div>
   <div id="bottom" style="text-align:center;border-top:1px solid #ddd;">
<span class="centerspan" style="font-size:10px">Copyright © 2017 Zenitour lnc All Rights Reserved　版权所有-哲途教育  渝ICP备13002955号-2</span>
</div>
    </body>



            
         html,body {
            width: 100%;
            height: 100%;
            margin: 0;
            padding: 0;
        }