SOURCE

onload=function(){
  document.getElementById("btn_add");
  let table=document.getElementsByTagName("table")[0];
  let id=document.getElementsByTagName("input")[0].value;
  let id=document.getElementsByTagName("input")[1].value;
  let tr=document.createElement("tr");
  
  let td0=document.createElement("td");
  let tdID=document.createTextNode(id);
  td0.appendChild(tdID);
  tr.appendChild(tdID);
  tr.appendChild(td0);
  
  let td1=document.createElement("td");
  let tdName=document.createTextNode(name);
  td1.appendChild(tdName);
  tr.appendChild(td1);
  table.appendChild(tr);
}

<table onload="load1()">
  <div>
    <input type="text" id="id" placeholder="输入样例">
    <input type="text" id="name" placeholder="输入样例答案">
    <input type="button" value="添加样例" id="btn_add">
  </div>
  <table border="1" cellspacing="0" cellpadding="10" align="center">
        <tr>
          <th class="a">样例编号</th>
          <th class="a">样例答案姓名</th>
          <th class="a">操作职位</th>
           <th class="a">操作薪水</th>
           <th class="a">操作</th>
        </tr>
        <tr>
          <td>1</td>
          <td>2</td>
          <td>2</td>
          <td>2</td>
          <td><a href="javascrpt:void(0);" onclick="del(this)">删除</a></td>
        </tr>
        <tr>
          <td >February</td>
          <td>sdsdf</td>
          <td>2</td>
          <td>2</td>
           <td><a href="javascrpt:void(0);" onclick="del(this)">删除</a></td>
        </tr>
        <tr>
          <td>Sum</td>
          <td>$180</td>
          <td>2</td>
          <td>2</td>
           <td><a href="javascrpt:void(0);" onclick="del(this)">删除</a></td>
        </tr>
</table>