js判断当值的比较小的背景为红色 

<!DOCTYPE html>
<html>
<head>
    <title></title>
</head>
<body>
    <table width="500px" border="1px solid #ccc">
        <thead>
        
            <td>首页</td>
            <td>数字</td>
            <td>关于</td>
            <td>我们</td>
            
        </thead>
    <tbody class="parent">
            <!-- <tr>
            <td>1</td>
            <td class="small">2</td>
            <td>3</td>
            <td class="big" >5</td>
        </tr> -->
    </tbody>
    </table>
    <script type="text/javascript">
    
    var parent=document.querySelectorAll(".parent")[0];
    var tr="";
    for(var i=0;i<9;i++){
         tr+='<tr><td>1</td><td class="small">2</td><td>3</td><td class="big" >5</td></tr>'

    };
    parent.innerHTML=tr;
    var small=document.querySelectorAll(".small");
    var big=document.querySelectorAll(".big");
    console.log(small);
    console.log(big);
    for(var j=0;j<small.length;j++){
        if(big[j].innerHTML>small[j].innerHTML){
        big[j].style.backgroundColor="red";
    }else{
        big[j].style.backgroundColor="white";
    }

    }
    
    </script>
</body>
</html>

 

posted @ 2017-05-08 16:58  车水码龙  阅读(284)  评论(0)    收藏  举报