Prevent clicking the backspace key to make the page rewind the instance code

Prevent clicking the backspace key to make the page rewind the Instance code:
Some friends who often use the editor may encounter this phenomenon, when the use of BACKSPACE backspace delete text, and did not achieve this effect, but to make the page retrograde phenomenon, this is a very annoying thing, because sometimes the content has been edited to disappear, Here's a quick introduction to how to prevent this from happening.
The code is as follows:

$ (document). KeyDown (function(e) {vardoprevent; if(e.keycode==8){     vard=e.srcelement| |E.target; if(d.tagname.touppercase () = = ' INPUT ' | | D.tagname.touppercase () = = ' TEXTAREA ') {doprevent=d.readonly| |d.disabled; }     Else{doprevent=true; }      }   Else{doprevent=false; }  if(doprevent) {e.preventdefault (); }})

The above code can implement this function, here is not much introduced, if there are any questions can be thread message.

The original address is: http://www.softwhy.com/forum.php?mod=viewthread&tid=9040

For more information, refer to: http://www.softwhy.com/jquery/

Prevent clicking the backspace key to make the page rewind the instance code