window.onload = function () {
var tds = document.getElementById(‘tb‘).getElementsByTagName(‘td‘);
for (var i = 0; i < tds.length; i++) {
tds[i].onmouseover = function () {
for (var j = 0; j < tds.length; j++) {
tds[j].innerText = ‘★‘;
if (tds[j] == this) {
break;
};
};
};
tds[i].onmouseout = function () {
for (var i = 0; i < tds.length; i++) {
tds[i].innerText = ‘☆‘;
}
};
};
};
<table id="tb" border="0" cellpadding="0" cellspacing="0">
<tr>
<td>☆
</td>
<td>☆
</td>
<td>☆
</td>
<td>☆
</td>
<td>☆
</td>
</tr>
</table>
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原文：http://blog.csdn.net/charles0391/article/details/24557433
