document.onkeydown = function(){
if((event.keyCode == 8)){ //屏蔽退格删除键
if(window.event.srcElement.tagName.toUpperCase() != "INPUT"
&& window.event.srcElement.tagName.toUpperCase() != "TEXTAREA"
&& window.event.srcElement.tagName.toUpperCase() != "TEXT"){
event.keyCode = 0;
event.returnValue = false;
}else{
if(window.event.srcElement.readOnly){
event.keyCode = 0;
event.returnValue = false;
}
}
}
}
if((event.keyCode == 8)){ //屏蔽退格删除键
if(window.event.srcElement.tagName.toUpperCase() != "INPUT"
&& window.event.srcElement.tagName.toUpperCase() != "TEXTAREA"
&& window.event.srcElement.tagName.toUpperCase() != "TEXT"){
event.keyCode = 0;
event.returnValue = false;
}else{
if(window.event.srcElement.readOnly){
event.keyCode = 0;
event.returnValue = false;
}
}
}
}