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Simple JavaScript code to implement calculator operations

Source: Internet
Author: User
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Copy codeThe Code is as follows: <Head>
<Title> JS calculator </title>
<Link rel = "stylesheet" type = "text/css" href = "">
<Meta http-equiv = "content-type" content = "text/html; charset = UTF-8">
<! -- JavaScript code can be placed in any position and executed sequentially among head labels. -->
<Script type = "text/javascript">

/* Define a Calculator class */
Function Calculator (){

This. jisuan = function (num1, num2, callback ){
Var res = 0;
Switch (switches ){
Case "+ ":
Res = num1 + num2;
Break;
Case "-":
Res = num1-num2;
Break;
Case "*":
Res = num1 * num2;
Break;
Case "/":
Res = num1/num2;
Break;
}
Return res;
}
}
// Create an object
Var calculator = new Calculator ();

/* Define global variables */
Var val = 0; // place the input value
Var xval = 0; // Save the converted Number type value
Var temp = 0; // Save the value entered for the first time
Var operator = ""; // Save the input Operator

/* Obtain the input number */
Function inputEvent (e ){

Val = e. value
Var xsval = document. getElementById ("inp1 ");
Xsval. value + = val; // continuous input number (String type)
// Convert the Number type
Xval = parseFloat (xsval. value );

}

/* Obtain the data of the first row */
Function inputPCB (e ){
// Window. alert (e. value );
Var xsval = document. getElementById ("inp1 ");
If (e. value = "Clear "){
Xsval. value = "";
} Else if (e. value = "Back "){
/* This function has not yet been implemented. If you are interested, you can do it yourself */

} Else if (e. value = "POWER "){
// Calculates the square
Xsval. value = Math. pow (xsval. value, 2 );
}
}

/* Input operator */
Function inputOper (e ){

Vertex = e. value;
// Window. alert (typeof alert );
// Response = response. substr (0 );
If (e. value = "+ "){
Var xsval = document. getElementById ("inp1 ");
// Save the last calculation result and convert the string to the Number type
Temp = parseFloat (xsval. value );
// The value entered for the first time 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 Result */
Function inputEquel (e ){

Var xsval = document. getElementById ("inp1 ");
If (e. value = "= "){
// Window. alert (xval );
// Call the object Method
Xsval. value = calculator. jisuan (temp, xval, interval );
}
}
</Script>
<! -- Css style -->
<Style>
Input {
Width: 60px;
}
# Inp1 {
Width: 280px;
Text-align: right;
}
</Style>
</Head>
<Body>
<Table border = "1">
<! -- Display result rows -->
<Tr> <td colspan = "4"> <input id = "inp1" type = "text" value = "" name = "xianshi"/> </td> </ tr>

<! -- The first line -->
<Tr> <td> <input type = "button" value = "POWER" onclick = "inputPCB (this) "/> </td> <input type =" button "value =" Clear "onclick =" inputPCB (this) "/> </td> <input type =" button "value =" Back "onclick =" inputPCB (this) "/> </td> </tr>
<! -- The second line -->
<Tr> <td> <input type = "button" value = "1" onclick = "inputEvent (this) "/> </td> <input type =" button "value =" 2 "onclick =" inputEvent (this) "/> </td> <input type =" button "value =" 3 "onclick =" inputEvent (this) "/> </td> <input type =" button "value =" 4 "onclick =" inputEvent (this) "/> </td> </tr>
<! -- Row 3 -->
<Tr> <td> <input type = "button" value = "5" onclick = "inputEvent (this) "/> </td> <input type =" button "value =" 6 "onclick =" inputEvent (this) "/> </td> <input type =" button "value =" 7 "onclick =" inputEvent (this) "/> </td> <input type =" button "value =" 8 "onclick =" inputEvent (this) "/> </td> </tr>
<! -- Row 4 -->
<Tr> <td> <input type = "button" value = "9" onclick = "inputEvent (this) "/> </td> <input type =" button "value =" 0 "onclick =" inputEvent (this) "/> </td> <input type =" button "value = ". "onclick =" inputEvent (this) "/> </td> <input type =" button "value =" = "onclick =" inputEquel (this) "/> </td> </tr>
<! -- Fifth line -->
<Tr> <td> <input type = "button" value = "+" onclick = "inputOper (this) "/> </td> <input type =" button "value ="-"onclick =" inputOper (this) "/> </td> <input type =" button "value =" * "onclick =" inputOper (this) "/> </td> <input type =" button "value ="/"onclick =" inputOper (this) "/> </td> </tr>

</Table>
</Body>
</Html>

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