为什么这个js对表格第一行没作用
html
Document Object Model
ltinerary
When
Where
June 9th
Portland,OR
June 10th
Seattle,WA
June 12th
Sacramento,CA
css
body{
font-family:"Helvetica","Arial",sans-serif;
font-size:18pt;
}
table{
margin:10px;
border:1px solid #699;
}
caption{
padding:0.2em;
text-align:center;
font-weight:bold;
font-size:1.2em;
}
th{
font-weight:normal;
font-style:italic;
text-align:left;
border:1px dotted #669;
background-color:#9cc;
color:#000;
}
th,td{
width:10em;
padding:0.5em;
}
js
function heightlightRows(){
if(!document.getElementsByTagName) return false;
var rows = document.getElementsByTagName("tr");
for(var i=0; i
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因为你在css里写死了th的font-weight是normal,而你在js里只是改变tr的font-weight为bold,所以不起作用。改成这样就可以了: