首先看html

  <div style="width: 100%;">
      <div class="table-head" id="btid1">
      <table>
          <colgroup>
              <col style="width: 80px;" />
              <col />
          </colgroup>
          <thead>
              <tr><th>序號</th><th>內容</th></tr>
         </thead>
     </table>
     </div>
     <div class="table-body" id="gdid">
     <table>
         <colgroup><col style="width: 80px;" /><col /></colgroup>
         <tbody>
             <tr><td>1</td><td>我只是用來測試的</td></tr>
             <tr><td>2</td><td>我只是用來測試的</td></tr>
             <tr><td>3</td><td>我只是用來測試的</td></tr>
             <tr><td>4</td><td>我只是用來測試的</td></tr>
             <tr><td>5</td><td>我只是用來測試的</td></tr>
             <tr><td>6</td><td>我只是用來測試的</td></tr>
             <tr><td>7</td><td>我只是用來測試的</td></tr>
             <tr><td>8</td><td>我只是用來測試的</td></tr>
             <tr><td>9</td><td>我只是用來測試的</td></tr>
             <tr><td>10</td><td>我只是用來測試的</td></tr>
             <tr><td>11</td><td>我只是用來測試的</td></tr>
             <tr><td>12</td><td>我只是用來測試的</td></tr>
             <tr><td>13</td><td>我只是用來測試的</td></tr>
             <tr><td>14</td><td>我只是用來測試的</td></tr>
             <tr><td>15</td><td>我只是用來測試的</td></tr>
         </tbody>
     </table>
     </div>
 </div>

css如下

.table-head{padding-right:11px;padding-top:14px;padding-bottom:5px;}
.table-body{width:100%; height:800px;overflow-y:scroll;}
.table-head table,.table-body table{width:100%;}
.table-body table tr:nth-child(2n+1){}
.table-body table tr:hover{}

js如下

autodivheight();
function autodivheight(){ //函數：獲取尺寸
    //獲取瀏覽器窗口高度
    var winHeight=0;
    if (window.innerHeight)
        winHeight = window.innerHeight;
    else if ((document.body) && (document.body.clientHeight))
        winHeight = document.body.clientHeight;
    //通過深入Document內部對body進行檢測，獲取瀏覽器窗口高度
    if (document.documentElement && document.documentElement.clientHeight)
        winHeight = document.documentElement.clientHeight;
    //DIV高度為瀏覽器窗口的高度
    var btHeight1 = document.getElementById("btid1").offsetHeight;//表頭高度
    document.getElementById("gdid").style.height= winHeight-btHeight1-15 +"px";
}