calculator with backspace

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JS realizes analog Calculator backspace key method to delete text effects

This article mainly introduced the JS realizes the simulation calculator backspace key to delete the text effect method, involves the JavaScript string interception operation related skill, needs the friend to be possible to refer to under ? 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26-27--28 29---30 31--32 33 34 35 36 37 38-39 40 41 42 45 46 47 48 49 50 51 52 53 54 55

JS realizes analog calculator backspace key remove text effects _javascript Tips

This article is an example of how JS implements the simulation calculator backspace key to delete text effects. Share to everyone for your reference. as follows: The wants this article to help you with your JavaScript programming.

360 Browser Press BACKSPACE backspace key cannot delete data, return to previous page

Editor's note: This article has been the original bonus points, please continue to work! I recently started using 360 browser, in the article when the wrong word, want to press BACKSPACE backspace key to delete, the result returned to the previous page. Remember before using a low version of Chrome, Chrome is the backspace set to return to the previous page of t

Solve vim backspace (BACKSPACE) is not available

Two steps:1. Remove the annoying VI consistency pattern and avoid some bugs and limitations of previous versionsSet nocompatible2.backspace has several ways of working, which are VI compatible by default. Very unaccustomed to beginners. People who are not so familiar with the old VI are also very troubled. can be usedSet Backspace=indent,eol,startTo solve.Indent: If used: Set Indent,:set AI and other auto-i

JS backspace key: JS shielding function Class (shielding F5, backspace keys, space bar ...)

1. Shielding function class 1.1 Screen Keyboard all keys 1.2 Screen right mouse button Add Oncontextmenu=self.event.returnvalue=false to the body tag. Or function Nocontextmenu () { if (document.all) { Event.cancelbubble=true; Event.returnvalue=false; return false; } } Or 1.3 Mask CTRL + N, Shift+f10, F5 refresh, backspace key Screen the right mouse button, CTRL + N, Shift+f10, F5 refresh, backspace key

The Backspace event is blocked on the webpage. The input box is not blocked, and the backspace input box is

The Backspace event is blocked on the webpage. The input box is not blocked, and the backspace input box is 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!

Linux notes (4) when using the VI Editor in Ubuntu, you cannot use the BACKSPACE key to backspace or not function properly.

Excerpt from: http://blog.csdn.net/xiaojun111111/article/details/50810439http://hongzhguan.iteye.com/blog/1479563Just put the Ubuntu system reinstall on the virtual machine, and then try VI Editor, found that using VI, can not use the BACKSPACE key to BACKSPACE, backspace key press down to become ABCD, delete key is invalid.Workaround:Programme one:The vim full v

Linux environment Oracle Sqlplus use BACKSPACE backspace back to delete the solution that appears ^h

Label:1. Set back to delete before entering SqlplusBefore entering Sqlplus, execute the following command at the current terminal: Stty erase ' ^h '.Stty: Modify the terminal parameters. If you do not want to enter the terminal every time this command, in the current user's. Profile Add this command. The meaning of this command is to useThe BACKSPACE key is used as the DELETE key.2, in Sqlplus with Ctrl+backspace

Disable browser backspace key (BACKSPACE) when jumping page (extjs,javascript)

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

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

[Experience compilation principles] compile a simple calculator and compile a principle Calculator

;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

Android development implementation calculator example, android calculator example

(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.

Retrieve the 'failed' function of the Ubuntu13.04 'backspace' key

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

JS Disable browser backspace key implementation ideas and code _javascript skills

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

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 =

How does JavaScript disable Backspace key_javascript?

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

How JavaScript disables backspace keys _javascript tips

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

Python Scientific calculator (calculator)

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

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.

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

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