// 屏蔽点击BackSpace键页面后退
document.getElementsByTagName("body")[0].onkeydown = function(event){
// 获取事件对象指向的element
var elem = event.relatedTarget || event.srcElement || event.target ||event.currentTarget;
//alert(elem.tagName);
// 判断按键为BackSpace键
if(event.keyCode == 8) {
if (elem.tagName.toUpperCase() != "INPUT"
&& elem.tagName.toUpperCase() != "TEXTAREA"
&& elem.tagName.toUpperCase() != "TEXT"
|| elem.readOnly || elem.disabled) {
if(event.returnValue){
event.returnValue = false ;
}else if(event.preventDefault ){
event.preventDefault();
}
return false;
}
}
};
document.getElementsByTagName("body")[0].onkeydown = function(event){
// 获取事件对象指向的element
var elem = event.relatedTarget || event.srcElement || event.target ||event.currentTarget;
//alert(elem.tagName);
// 判断按键为BackSpace键
if(event.keyCode == 8) {
if (elem.tagName.toUpperCase() != "INPUT"
&& elem.tagName.toUpperCase() != "TEXTAREA"
&& elem.tagName.toUpperCase() != "TEXT"
|| elem.readOnly || elem.disabled) {
if(event.returnValue){
event.returnValue = false ;
}else if(event.preventDefault ){
event.preventDefault();
}
return false;
}
}
};
