calculator with backspace

Ext Implementation Method://Method OnevarKey =NewExt.keymap (document,{key:8, fn:function(obj,e) {varType =E.target.type; varReadOnly =e.target.readonly; if(Type! = ' text ' type! = ' textarea ' type! = ' Password '){//E.preventdefault ();e.stopevent (); }Else if(readonly) {//E.preventdefault ();e.stopevent (); }}, Scope: This});//Method TwoExt.getdoc (). On (' KeyDown ',function(e) {if(E.getkey () = = 8 e.gettarget (). Type = = ' text ' !e.gettarget (). readOnly) { }Else if(E.

Where is the Win10 calculator? Three ways to open the Win10 calculator: graphic introduction, win10 Calculator The brand-new windows 10 system has brought about many new features and changes. Among them, the position of the win10 calculator has changed a lot, so many netizens think that the win10

;Private JTextField displayField; // computing result display areaPrivate String lastCommand; // save +,-, *,/, = commandPrivate double result; // Save the calculation result.Private boolean start; // determines whether it is the start of a number.Public Calculator (){Super ("Calculator ");Container = getContentPane ();Layout = new GridBagLayout ();Container. setLayout (layout );Constraints = new GridBagCon

(typeClean = true ){ResultText = "0 ";TypeClean = false;}If (num. equals (".") currentText. lastIndexOf (".")! =-1) return;If (resultText. equals ("0") | resultText. equals (""))! Num. equals ("."))ResultText = "";ResultText = resultText + num;SetResultText (resultText );} Private void backSpace (){If (currentText. equals ("0") | currentText. equals ("") return;If (currentText. length () = 1 ){SetResultText ("0 ");Return;}SetResultText (currentText.

Users who use Ubuntu13.04 may find a detail. In Ubuntu13.04, the return function of the rsquo; Backspace rsquo; key is gone. No movement is made when pressing the rsquo; Backspace rsquo; key in Nautilus/Thunar or Firefox (normally, the return function should be used) at first, I thought it was an aftereffect for upgrading the system, but later I learned that Ubuntu 13 was installed normally. Users who u

A project was submitted last week (used internally), together with a bug, said to disable the BACKSPACE key (BACKSPACE or call Back button), because this and his habits are not the same, fearing that if the text input half, he pressed the backspace key, the whole page of the content of white filled, Then vowed to say that he did the system back key is not used, I

How does js disable the Backspace key to bring the browser back? jsbackspace In the project, if you press the Backspace key to bring the browser back, several solutions are not ideal. Therefore, the wisdom of the masses and the wisdom of the family are summarized as follows: 1. Define the method to block Backspace in public js Function banBackSpace (e) {var ev =

This article mainly introduces how JavaScript disables the Backspace key, which can help you solve the problem of "rolling back to the previous page by pressing the Backspace key in the read-only input box in IE, if you are interested, you can refer to the findings in IE today. when you use the readonly = "readonly" attribute to set the text box to read-only There is a strange problem: if the cursor enters

Today found in IE browser, when the use of the readonly= "ReadOnly" property to set the text box to read-only is that if the cursor goes into a read-only text box and then presses the BACKSPACE key, it jumps to the previous page, as if clicking the Back button on the browser returns to the previous page, and there is no such problem with Firefox and Google. , to solve this problem, write a method such as the following, if the text box is read-only

DescriptionThe calculator is written primarily to practice regular expressions and Python basics: code comparison low!Run processEnter your calculation formula and the calculator will output the results to the screen (the steps will be printed here); Exit (Exit/quit)Mycalc> 1-2 * ((60-30 + ( -40/5) * (9-2*5/3 + 7/3*99/4*2998 +10 * 568/14))-( -4*3)/(16-3*2)) 1-2* ((60-30+ ( -40/5) * ( 9-2*5/3+7/3*99/4*2998+1

JQuery implements a method to prevent the return of the backspace key This article mainly introduces JQuery's method to prevent the return of the Backspace key. The example shows how jQuery makes Backspace unavailable while Backspace is still available in the browser, which is of great practical value, for more informa

Using vi in ubuntu is a solution for changing the direction keys to garbled characters _ The backspace key cannot be used. This evening, the teacher assigned us a ubuntu Virtual Machine and said we would like to use it for experiments. Of course, it doesn't matter. My favorite is ubuntu, but it may be a very difficult experiment process for some people who are not familiar with linux. Using vi in ubuntu is a solution for changing the direction keys to