Simple JS code to implement calculator operation

Simple JS code to implement calculator operation _ basic knowledge

Last Update:2017-01-19 Source: Internet

Author: User

Tags function calculator

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Copy Code code as follows:

<title>js Version Calculator </title>
<link rel= "stylesheet" type= "Text/css" "href=" ">
<meta http-equiv= "Content-type" content= "Text/html;charset=utf-8" >

<script type= "Text/javascript" >

/* Define a calculator class * *
function Calculator () {

This.jisuan=function (Num1,num2,oper) {
var res=0;
Switch (OPER) {
Case "+":
res=num1+num2;
Break
Case "-":
res=num1-num2;
Break
Case "*":
res=num1*num2;
Break
Case "/":
res=num1/num2;
Break
}
return res;
}
}
Creating objects
var calculator=new calculator ();

/* Define global variable * *
var val=0; Place the input value
var xval=0;//saves the value of the converted number type
var temp=0; Save the value you entered for the first time
var oper= "";//Save input operator

   /* Get input number */
    function InputEvent (e) {

       val=e.value
        var xsval= document.getElementById ("Inp1");
         Xsval.value+=val; Continuous input numbers (string type)
       //Convert number type
         xval=parsefloat (Xsval.value);

   }

/* Get the first line of data * *
function INPUTPCB (e) {
Window.alert (E.value);
var Xsval=document.getelementbyid ("Inp1");
if (e.value== "clear") {
Xsval.value= "";
}else if (e.value== "back") {
* * This feature has not yet been realized, interested friends can do their own * *

}else if (e.value== "power") {
Calculate squared
Xsval.value=math.pow (xsval.value,2);
}
}

/* Input operator/*
function Inputoper (e) {

Oper=e.value;
Window.alert (typeof Oper);
OPER=OPER.SUBSTR (0);
if (e.value== "+") {
var Xsval=document.getelementbyid ("Inp1");
Saves the last calculated result and converts the number type to the string
Temp=parsefloat (Xsval.value);
The first value entered is set to NULL
Xsval.value= "";
}else if (e.value== "-") {
var Xsval=document.getelementbyid ("Inp1");
Temp=parsefloat (Xsval.value);
Xsval.value= "";
}else if (e.value== "*") {
var Xsval=document.getelementbyid ("Inp1");
Temp=parsefloat (Xsval.value);
Xsval.value= "";
}else if (e.value== "/") {
var Xsval=document.getelementbyid ("Inp1");
Temp=parsefloat (Xsval.value);
Xsval.value= "";
}
}

/* Calculation Results * *
function Inputequel (e) {

PS: Here again for you to recommend two online calculator this site, are implemented with JS, and powerful, I believe that in-depth understanding of JavaScript math and web design will help:

Online Standard calculator:http://tools.jb51.net/jisuanqi/jsq

Online Science calculator:Http://tools.jb51.net/jisuanqi/jsqkexue

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