<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>test</title>
<style type='text/css'>
a:link{
color: red;
}
a:visited{
color: green;
}
a:hover{
border: 1px solid black;
}
a:active{
border: 4px solid green;
}
</style>
</head>
<body>
<a href="Example_3-6.html">linkasdfas</a>
</body>
</html>
:link设置为红色,但是从用浏览器打开却直接显示绿颜色