有个投诉说页面变形了，一问才知道页面被用户不小心zoom了，这个情况最好是能对用户有个提示。写了个IE和firefox下检测zoom的demo：
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN" >
<HTML >
<BODY >
<div id ="output" ></div >
<SCRIPT LANGUAGE ="JavaScript" >
( function (){
window.onresize = testZoom;
var _screenOriginalWidth = window.screen.width
function testZoom(){
if (window.screen.width < _screenOriginalWidth){
document.getElementById("output").innerHTML = " <br>Zoom In " ;
}
if (window.screen.width > _screenOriginalWidth){
document.getElementById("output").innerHTML = " <br>Zoom Out " ;
}
_screenOriginalWidth = window.screen.width
}
})()
</SCRIPT>
</BODY>
</HTML>