document.onkeydown = function (e) {
var code;
if (!e){ var e = window.event;}
if (e.keyCode){ code = e.keyCode;}
else if (e.which){ code = e.which;}
//BackSpace 8;
if (
(event.keyCode == 8)
&& ((event.srcElement.type != "text" && event.srcElement.type != "textarea" && event.srcElement.type != "password")
|| event.srcElement.readOnly == true
)
) {
event.keyCode = 0;
event.returnValue = false;
}
return true;
};
转载于:https://www.cnblogs.com/gcczhongduan/p/5363008.html
相关资源：js屏蔽backspace后退，又不影响删除输入框文字
