jQuery实现表格隔行换色 jQuery实现表格隔行换色

时间:2021-03-30 一觉至天明人气:0

<!DOCTYPE html>
<html>
  <head>
    <meta charset="UTF-8">
    <title>使用JQ完成表格隔行换色</title>
    <script src="js/jquery.min.js"></script>
    <script>
      $(function() {
        $("tbody tr:odd").css("background-color","aquamarine");
        $("tbody tr:even").css("background-color","bisque");
        var tb = $("tbody tr");
        var oldColor;
        for(var i=0;i<tb.length;i++) {
          //alert(oldColor);
          $("tbody tr")[i].onmouseover = function() {
            oldColor = this.style.backgroundColor;
            this.style.backgroundColor = "yellow";
          }
          $("tbody tr")[i].onmouseout = function() {
            this.style.backgroundColor = oldColor;
          }
        }
      });
    </script>
  </head>
  <body>
    <table id="tbl" border="1" border-collapse="collapse" align="center" cellspacing="0" cellpadding="5" width="400" height="20">
      <thead>
        <tr>
          <th>编号</th><th>姓名</th><th>年龄</th>
        </tr>
      </thead>
      <tbody>
        <tr>
          <td>1</td><td>张三</td><td>12</td>
        </tr>
        <tr>
          <td>2</td><td>李四</td><td>22</td>
        </tr>
        <tr>
          <td>3</td><td>王五</td><td>13</td>
        </tr>
        <tr>
          <td>4</td><td>马六</td><td>14</td>
        </tr>
        <tr>
          <td>5</td><td>伍六七</td><td>17</td>
        </tr>
        <tr>
          <td>6</td><td>梅花十三</td><td>17</td>
        </tr>
      </tbody>
    </table>
  </body>
</html>

疑问：为什么this.style.backgroundColor = oldColor中的this不能用$("tbody tr")[i]代替？？

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