How to get html to print return value of javascript function?

What is the preferred syntax to get html to print return value of javascript function?

function produceMessage(){
    var msg= 'Hello<br />';
    return msg;
}

EDIT: Yikes, too many answers without me clarifying what I meant. 开发者_Go百科I know how to do it via the script tag. However, let's say I wanted to make the message red. Would I just encase the script tag inside my css like so?

<div style="color:red><script>document.write(produceMessage())</script></div>

I guess my main question was, should you be using document.write to get the return values to print?

There are some options to do that.

One would be:

document.write(produceMessage())

Other would be appending some element in your document this way:

var span = document.createElement("span");
span.appendChild(document.createTextNode(produceMessage()));
document.body.appendChild(span);

Or just:

document.body.appendChild(document.createTextNode(produceMessage()));

If you're using jQuery, you can do this:

$(document.body).append(produceMessage());

It depends what you're going for. I believe the closest thing JS has to print is:

document.write( produceMessage() );

However, it may be more prudent to place the value inside a span or a div of your choosing like:

document.getElementById("mySpanId").innerHTML = produceMessage();

if you really wanted to do that you could then do

<script type="text/javascript">
    document.write(produceMessage())
</script>

Wherever in the document you want the message.

<script type="text/javascript">
    document.write("<p>" + Date() + "</p>");
</script>

Is a good example.

Or you can tell javascript where to write it.

<script type="text/javascript">
    var elem = document.getElementById('myDiv');
    var msg= 'Hello<br />';
    elem.innerHTML = msg;
</script>

You can combine this with other functions to have function write content after being evaluated.

you could change the innerHtml on an element

function produceMessage(){
    var msg= 'Hello<br />';
     document.getElementById('someElement').innerHTML = msg;
}

Most likely you're looking for something like

var targetElement = document.getElementById('idOfTargetElement');
targetElement.innerHTML = produceMessage();

provided that this is not something which happens on page load, in which case it should already be there from the start.