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<title>無標題文檔</title>
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function getTr(){
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for(var i=0;i<trs.length;i++){
var classnames=document.getElementById("a").className ;
//獲取所有tr的classname的值
if( i % 2 == 0){
trs[i].style.background="1px solid yellow";
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<body>
<table width="200" border="0">
<tr class="namea" id="a" >
<td>啊啊啊啊啊啊啊啊啊啊啊</td>
</tr>
<tr class="nameb" id="a" >
<td>白拜拜拜拜拜拜拜拜拜拜</td>
</tr>
<tr class="namea" id="a" >
<td>哈哈哈哈哈哈哈哈哈哈哈</td>
</tr>
<tr class="nameb" id="a" >
<td>反反覆覆反反覆覆反反</td>
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<tr class="namea" id="a" >
<td>就斤斤計較斤斤計較斤斤</td>
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