<body onload="timeCount()"> <span id="fps"></span> <script type="text/javascript"> var second=0; function timeCount(){ setTimeout("timeCount()",1000); second=second+1; document.getElementById('fps').innerHTML=second; } </script>
按下ESC键事件触发
<script> document.onkeydown = function(event){ if (event.keyCode == 27) { alert("按下了ESC键，键位值27"); } } </script>
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