Question

Can you pass key-value pairs to a JavaScript file like that:

<script type="text/javascript" src="http://www.example.com/script.js?key=value"></script>

Answer 1

Not easily, unless you want them to be processed by server-side code that generates Javascript.

However, you can define variables in an earlier script block as parameters.

For example:

<script type="text/javascript">
    var key = value;
</script>

<script type="text/javascript" src="http://www.example.com/script.js></script>

You can then use the key variable in script.js just like any other variable.

EDIT: As Upper Stage pointed out, it would be a better idea to put the parameters inside their own namespace.

For example:

<script type="text/javascript">
    var MyScriptParameters = {
        param1: 123,
        param2: "Hello",
        param3: new Date,
        param4: function(text) { ... }
    };
</script>

You could then write MyScriptParameters.param2 in script.js (Or in any other script on the page)