小编Jon*_*now的帖子

我正在尝试制作一个能够显示奇数和偶数表行颜色的表,不知道我哪里出错了

HTML:

<table id="tableStyles" border="1">
  <th>Heading 1</th>
  <th>Heading 2</th>
  <th>Heading 3</th>
  <tr>
    <td>Odd</td>
    <td>Odd</td>
    <td>Odd</td>
  </tr>
  <tr>
    <td>Even</td>
    <td>Even</td>
    <td>Even</td>
  </tr>
  <tr>
    <td>Odd</td>
    <td>Odd</td>
    <td>Odd</td>
  </tr>
  <tr>
    <td>Odd</td>
    <td>Odd</td>
    <td>Odd</td>
  </tr>
</table>

JS:

var isEven = function(someNumber) {
  return (someNumber%2 == 0) ? true : false;
};
if isEven = true {
  var styletab = document.getElementsByTagName("tableStyles");
  var cells = table.getElementsByTagName("td"); 
  for (var i = 0; i < styletab.length; i++) {
    styletab[i].style.fontSize = "12px";
    styletab[i].style.color = "blue";
  }

} else { …