[Learning]#14 JS: create a calculator by prompt()

Final Calculator Design

<!DOCTYPE html>
<html>
<head>
<title>JavaScript</title>
<script type="text/javascript">
var n1=prompt("Please key in a random number.","e.g.123");
var n2=prompt("Please key in a random number.","e.g.123");
var result=n1*n2;
alert(result);
</script>
</head>
</html>

Design a Calculator

prompt() is a dialogue box that user can key in values, and it will close until the user submit or cancel.

Basing on the rule, we separate the user behavior into steps, like:
input: prompt(default value or an example) → operate → output: alert(data)

For example, to create a simple calculator…

var n1=prompt("Please key in a random number." , "7");
var n2=prompt("Please key in a random number." , "7");
var result=n1*n2;
alert(result);

=> The result is 49.

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