js 返回浏览器版本和分辨率

<script type="text/javascript">

window.alert(navigator.userAgent);
var str = navigator.appVersion;
var array = str.split("MSIE");
var version = parseFloat(array[1]);
if(version >= 5.5){
	window.alert("您的浏览器为IE5.5以上的版本");
} else {
	window.alert('非IE浏览器');
}
window.alert('显示器分辨率:' + screen.width + ' x ' + screen.height + "--" + screen.colorDepth);

</script>