兼容ie跟火狐禁用tab键js

兼容ie和火狐禁用tab键js
兼容ie和火狐禁用tab键js

<!--禁用tab键，避免bug--><script type="text/javascript">document.onkeydown=function(e){var isie = (document.all) ? true:false;var key;var ev;if(isie){//IE浏览器key = window.event.keyCode;ev = window.event;}else{//火狐浏览器key = e.which;ev = e;}if(key==9){//IE浏览器if(isie){ev.keyCode=0;ev.returnValue=false;}else{//火狐浏览器ev.which=0;ev.preventDefault();}}};</script>