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JS's Simple Calculator

Source: Internet
Author: User
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# # # #闲来无事, write something small for beginners, here is a simple calculator, we look at the specific code:
<! DOCTYPE html>
<meta charset= "UTF-8" >
<title> Easy Calculator </title>
<style>
div{
height:100px;
margin:200px 350px;
}
</style>
<script type= "Text/javascript" >
function GetId (idname) {
return document.getElementById (Idname)
}
function count () {
Switch (getId ("select"). Value) {
Case "+":
GetId ("Txt3"). Value=parseint (GetId ("Txt1"). Value) +parseint (GetId ("Txt2"). Value)
Break

Case "-":
GetId ("Txt3"). Value=getid ("Txt1"). Value-getid ("Txt2"). Value
Break

Case "*":
GetId ("Txt3"). Value=getid ("Txt1"). Value*getid ("Txt2"). Value
Break

Case "/":
GetId ("Txt3"). Value=getid ("Txt1"). Value/getid ("Txt2"). Value
Break
}
}
</script>
<body>
<div>
<input type= "text" id= "Txt1" >
<select id= "Select" >
<option value= "+" >+</option>
<option value= "-" >-</option>
<option value= "*" >*</option>
<option value= "/" >/</option>
</select>
<input type= "text" id= "Txt2" >
<button onclick= "Count ()" >=</button>
<input type= "text" id= "Txt3" onclick= "Count ()" >
</div>

</body>

JS's Simple Calculator

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