<html>
<head>
<base target="main">
</head><body bgcolor="blue"><input type=text style="text-transform :uppercase" id='a1'>
</body></html>
<head>
<base target="main">
</head><body bgcolor="blue"><input type=text style="text-transform :uppercase" id='a1'>
</body></html>
<input onblur="this.value = this.value.toUpperCase();"><br>
<input style="text-transform:uppercase" onblur="alert(this.value);"><br>两种一起用:
<input style="text-transform:uppercase" onblur="this.value = this.value.toUpperCase();alert(this.value);">