SOURCE

console 命令行工具 X clear 

                    

                        
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console

            
window.onload = function () 
{
    var otds=document.getElementsByTagName("td");

    for(var i=0;i<otds.length;++i){
        otds[i].onclick=function(){
            var oparent=this.parentNode;
            oparent.style.color="white";
            oparent.style.backgroundColor="lightskyblue";
        }
    }

    var oul=document.getElementById("list");
    var ochildnodes=oul.childNodes;
    var ochildelements=oul.children;

    var obtn=document.getElementById("btn");

    obtn.onclick=function(){
        //oul.removeChild(oul.lastElementChild);

        //var prelastelement=oul.lastElementChild.previousElementSibling;
        //oul.removeChild(prelastelement);

        var prelastnode=oul.lastElementChild.previousSibling;
        oul.removeChild(prelastnode);
    }
}

            
<!DOCTYPE html> 
<html>
<head>
    <meta charset="utf-8" />
    <title></title>
    <style type="text/css">
        
    </style>
    <script>
       
    </script>
</head>
<body>
    <table>
        <caption>考试成绩表</caption>
        <tr>
            <td>小明</td>
            <td>80</td>
            <td>80</td>
            <td>80</td>
        </tr>
        <tr>
            <td>小红</td>
            <td>90</td>
            <td>90</td>
            <td>90</td>
        </tr>
        <tr>
            <td>小杰</td>
            <td>100</td>
            <td>100</td>
            <td>100</td>
        </tr>
    </table>

    <ul id="list">
        <li>HTML</li>
        <li>CSS</li>
        <li>JavaScript</li>
        <li>jQuery</li>
        <li>Vue.js</li>
    </ul>
    <button id="btn">删除</button>
</body>
</html> 


            
table{
    border-collapse:collapse;
}
table,tr,td{
    border:1px solid gray;
}