IE和Firefox的键盘事件

当得到键盘事件时，判断是IE还是Firefox：

onkeypress="return fnCheckNumber(event)"

function fnCheckNumber(event){//判断是IE还是firefoxevent = event?event:(window.event?window.event:"");var key = event.keyCode ? event.keyCode : event.which ? event.which : event.charCode;}