<script>
function check(){
if((window.event.keyCode>=48) && (window.event.keyCode<=57))alert('数字键');
if((window.event.keyCode>=65) && (window.event.keyCode<=96))alert('字母')
}
</script>
<body onkeydown="check()">
function check(){
if((window.event.keyCode>=48) && (window.event.keyCode<=57))alert('数字键');
if((window.event.keyCode>=65) && (window.event.keyCode<=96))alert('字母')
}
</script>
<body onkeydown="check()">
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