【click】
<!DOCTYPE html>
<html>
<head>
<script type='text/javascript'
src='http://ajax.googleapis.com/ajax/libs/jquery/1.7.2/jquery.min.js'></script>
<script type='text/javascript'>//<![CDATA[
$(window).load(function(){
$('a').get(0).click();
});//]]>
</script>
</head>
<body>
<a href="http://w3cschool.cn"> Download this pic </a>
</body>
</html>
