<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<script src="http://cdn.static.runoob.com/libs/jquery/1.10.2/jquery.min.js"></script>
<title></title>
</head>
<body>
<input type="text" name="" id="input" value="输入框改变时，文字变色" /><br /><br /><br />
<textarea name="" rows="" cols="" id="textarea">
输入框改变时，文字变色
</textarea><br />
<h6>select框改变时，文字变色</h6>
<select name="" id="select">
<option value="1">111</option>
<option value="2">222</option>
<option value="3">333</option>
</select>
</body>
<script type="text/javascript">
var oInput=$('input');
var oTextarea=$('textarea');
var oSelect=$('select');
oInput.change(function(){
$(this).css('color','red');
});
oTextarea.change(function(){
$(this).css('color','red');
});
oSelect.change(function(){
$(this).css('color','red');
});
</script>
</html>