当var长度小于1时更改边框颜色?当var长度小于1时更改边框颜色?
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<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.8.3/jquery.min.js"></script>
<script type="text/javascript">
$(window).load(function(){
$('#txt').keydown(function (e){
if(e.keyCode == 13){
var ex_se = $('#txt').val();
var ex_se_lenght = ex_se.length;
if(ex_se_lenght < '1')
{
// change border color id="txt" to red //
alert('red');
}
else
{
// change border color id="txt" to black //
alert('black');
}
}
})
});
</script>
<input type="text" id="txt"/>
http://jsfiddle.net/66chLg61/9/ ...在这里,你去! – void 2014-09-23 12:52:31
http://jsfiddle.net/mana5tLg/ – 2014-09-23 12:55:25