JS代码如下：
<script>
document.onkeydown = function(e) {
var isie = (document.all) ? true:false;
var key;
var ev;
if(isie){
key = window.event.keyCode;
ev = window.event;
}else{
key = e.which;
ev = e;
}
if(key==9){
if(isie){
ev.keyCode=0;
ev.returnValue=false;
}else{
ev.which=0;
ev.preventDefault();
}
}
}
</script>
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