如何在服务器端包含javascript文件？

Question

I want to include JS file inside another JS file, on server side, to prevent copy-paste and multiple JS files loading from client. Just like include('file.js') as PHP would do.

Answer 1

There is no built in way to include other JavaScript files from a JavaScript file ... but you can add them into the DOM ->

function addJavascript(jsname,pos) {
  var th = document.getElementsByTagName(pos)[0];
  var s = document.createElement('script');
  s.setAttribute('type','text/javascript');
  s.setAttribute('src',jsname);
  th.appendChild(s);
}

Example usage :

addJavascript('newExternal.js','body');

Answer 2

As Supercharging javascript article suggest - with PHP you can read all your .js files and create one big js file that you will send in one piece.

This is a simplification of the example from the article, just to get you started:

<?php 
define('SCRIPT_DIR', $_SERVER['DOCUMENT_ROOT'] . '/script/');

$files = array(
    'jquery.js',
    'myLib.js',
    'site.js'
);

header('Content-Type: text/javascript');
foreach (files as $file) {
    if (@readfile(SCRIPT_DIR . $file) === false) {
        error_log("javascript.php: Error reading file '$file'");
    }
}
?>

I would also recommend to read the full article Supercharging JavaScript in PHP to get more info.

Answer 3

JSfile = "1.js, 2.js, 3.js"

for loop it

document.write();

Answer 4

You will have to use a script loader and i would like to recommend script.js by Dustin Diaz who works at Twitter. Project Page on Github . Here is how you use it assuming you have a jquery plugin to be loaded in a page here is what you should do

// load jquery and plugin at the same time. name it 'bundle'
$script(['jquery.js', 'my-jquery-plugin.js'], 'bundle')

// load your usage
$script('my-app-that-uses-plugin.js')


/*--- in my-jquery-plugin.js ---*/
$script.ready('bundle', function() {
  // jquery & plugin (this file) are both ready
  // plugin code...
})


/*--- in my-app-that-uses-plugin.js ---*/
$script.ready('bundle', function() {
  // use your plugin :)
})

example is also from project page. Here are steps you should follow

1. Load the Script.js file first
2. Now include the dependency loader script that loads all the other wanted scripts async[the content of dependency loader script would be like above]