<body><SCRIPT LANGUAGE="JavaScript">
document.onkeydown = function(e)
{
e = window.event||e;
var code = e.keyCode || e.which;
alert(code);
}
</SCRIPT>
document.onkeydown = function(e)
{
e = window.event||e;
var code = e.keyCode || e.which;
alert(code);
}
</SCRIPT>
function insertTab(event,obj) {
var tabKeyCode = 9;
if (event.which) // mozilla
var keycode = event.which;
else // ie
var keycode = event.keyCode;
if (keycode == tabKeyCode) {
if (event.type == "keydown") {
if (obj.setSelectionRange) {
// mozilla
var s = obj.selectionStart;
var e = obj.selectionEnd;
obj.value = obj.value.substring(0, s) +
"\t" + obj.value.substr(e);
obj.setSelectionRange(s + 1, s + 1);
obj.focus();
} else if (obj.createTextRange) {
// ie
document.selection.createRange().text="\t"
obj.onblur = function() { this.focus(); this.onblur = null; };
} else {
// unsupported browsers
}
}
if (event.returnValue) // ie ?
event.returnValue = false;
if (event.preventDefault) // dom
event.preventDefault();
return false; // should work in all browsers
}
return true;
}//-->
</script>
<textarea onkeydown="return insertTab(event,this);"
onkeyup="return insertTab(event,this);"
onkeypress="return insertTab(event,this);"
rows="30" cols="80" ID=Textarea1>
</textarea>
focus到迫不得已才考虑，event.which早就考虑过了。