Loading module once, requirejs with examples

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I already ask similar question: Requirejs, what it means "Requirejs loads each module once"
but in that topic no one answer the main question, because i asked in

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难免孤独

2021-02-09 19:15

I changed your main.js to log to the console

require(['test1', 'test2', 'counter'], function(test1, test2, counter) {
        console.log("Executing main");
        console.log(counter.get());
});

In addition I have an index.html

<!DOCTYPE html>
<html>
<head>
    <title>My Counter Demo</title>
    <link rel="stylesheet" type="text/css" href="css/main.css">
    <script data-main="scripts/main" src="scripts/require.js"></script>
</head>
<body>
    <h1>My Counter Demo</h1>
</body>
</html>

After loading index.html and then opening the web console I have

[22:04:09.077] "Executing counter"
[22:04:09.077] "Executing test1"
[22:04:09.077] "Executing test2"
[22:04:09.077] "Executing main"
[22:04:09.078] 2

Log messages

To make it more clear what happens I suggest to substitute the log messages

Executing counter -> Creating the counter AMD module
Executing test1 -> Incrementing the counter in module "test1"
Executing test2 -> Incrementing the counter in module "test2"
"Executing main" -> Retrieving the counter value in module "main"

The I get the following result in the console log

[22:16:46.368] file:///C:/Users/User/Documents/requirejs-counter2/css/main.css
[22:16:46.368] file:///C:/Users/User/Documents/requirejs-counter2/scripts/require.js
[22:16:46.369] file:///C:/Users/User/Documents/requirejs-counter2/scripts/main.js
[22:16:46.588] file:///C:/Users/User/Documents/requirejs-counter2/scripts/test1.js
[22:16:46.589] file:///C:/Users/User/Documents/requirejs-counter2/scripts/test2.js
[22:16:46.590] file:///C:/Users/User/Documents/requirejs-counter2/scripts/counter.js
[22:16:46.381] "Creating the counter AMD module"
[22:16:46.381] "Incrementing the counter in module "test1""
[22:16:46.381] "Incrementing the counter in module "test2""
[22:16:46.381] "Retrieving the counter value in module "main""
[22:16:46.381] 2

Conclusion

The counter module is only loaded once and thus creating the counter object only once. You may consider it to be a Singleton.

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