jquery判断input值不为空的方法

<script type='text/javascript'>
$(document).ready(function(){
//enter回车键激活搜索
$('.searchbox').bind('keypress', function(event) {
if (event.keyCode == "13")
{
search_news();
}
});
var k = $(".searchbox").val();
if(k!=''){
document.location = "/plus/search.php?kwtype=0&searchtype=title&q=" + encodeURI(k);
}
</script>

$(function() {
$(".searchbox").blur(function() {
if ($(".searchbox").val() == "")
{ $(".searchbox").focus(); }
else
alert($(".searchbox").val());
});
});

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