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I just want to play a little bit with JS. I would like to use JS without HTML or a HTML page -- just a console for output. Whats the best way? I have this:

<html>
<body>
<h1>Playin around</h1>
<script type="text/javascript" src="script.js"></script>
</body>
</html>

script.js:

var test = "global";

function out() {
    var test = "local";
    return test;
}

window.alert(out());

How can I replace window.alert so I can get a console output & how to make a "main" or something, that I don't have to start on the HTML?

Thank you

I just want to play a little bit with JS. I would like to use JS without HTML or a HTML page -- just a console for output. Whats the best way? I have this:

<html>
<body>
<h1>Playin around</h1>
<script type="text/javascript" src="script.js"></script>
</body>
</html>

script.js:

var test = "global";

function out() {
    var test = "local";
    return test;
}

window.alert(out());

How can I replace window.alert so I can get a console output & how to make a "main" or something, that I don't have to start on the HTML?

Thank you

  • javascript
  • html
  • eclipse
Share Improve this question edited Apr 13, 2017 at 11:57 Ripon Al Wasim 37.8k42 gold badges159 silver badges178 bronze badges asked Oct 23, 2011 at 15:48 GolemGolem 1732 silver badges5 bronze badges
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5 Answers 5

Reset to default 4

I use JS Bin and JS Fiddle.

I'll be going off topic here. If you want something easy and quick to test javascript code, here's your path (based on my experience):

  1. Firebug in Firefox
  2. Javascript Console in Chrome
  3. JSFiddle

Before you asked, I don't know how to do javascript code in eclipse, sorry. *you may vote down this answer).

I use Windows primarily.

In every copy of Windows since Windows 95, there's a script host that allows you to run the Microsoft variant of Javascript, known as JScript, from the mand line. Open a cmd.exe window, and type in filename.js and Windows will run the Jscript in that file.

JScript is Javascript, with some extensions for Windows. One extension: a JScript program can create a COM object; this means you could use a JScript program to automate Word, or to create a "Compressed folder" (a zip file), or to send a FAX, by interacting with the COM objects available on Windows for those purposes.

But, if you want to just focus on the Javascript language, how to structure programs and modules, or more pure algorithmic programming, then JScript running in Windows Script Host is a really good option, if you are on Windows.

For example, the JSLINT, JSHINT, and CSSHINT tools - all written in pure Javascript - are all available in versions that run on Windows Script Host, from the Windows mand line. Using those versions, you could include a LINT check into a build script.

If you run a Javascript program on WSH, there is no HTML DOM. There is no window object, no document object. It's just Javascript.

Here's how I would structure your simple program for use on WSH: 

(function(globalScope){

    var test = "global"; 

    function say(x){ WScript.Echo(x); }

    function out() { 
        var test = "local"; 
        return test; 
    } 

    say(out()); 

}(this));

Notice the use of WScript.Echo - that's a JScript-only extension. This is the output of the program:

For something a little more interesting, given this JS module: 

(function(globalScope){
    'use strict';

    function say(x){ WScript.Echo(x); }

    if (typeof Array.prototype.numericSort !== 'function') {
        Array.prototype.numericSort = function() {
            return this.sort(function(a,b){return a - b;});
        };
    }

    var list = [17,  23, 2003, 39, 9172, 414, 3];

    say("array: [" + list.toString() + "]");

    var sortedList = list.numericSort();

    say("sorted: [" + sortedList.toString() + "]");

}(this));

Running it on WSH looks like this:

You can see I've used prototypal inheritance of the Array object. All the usual JS language features are there. You can learn quite a bit, just doing programs that run from the mand line.

Simplest solution would be to install FireBug for Firefox, then use the console:

console.log(out());

You want to run the javascript with out html page, Press F12 in Chrome then goto console and paste your code then press enter

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