How can I dynamically download and run a javascript script from a javascript console?

Is there a one-liner I could execute in a javascript console to download and execute a javascript script from a remote source?

I was looking to see if there was a nice way to download this script and use it for experimenting interactively on random pages which may not have say, jQuery loaded.

[edit: I'm aware I could dynamically create a script element but is 开发者_如何学Pythonthere a nicer way to do this?]

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I've written a little script for that.

var loadjQuery = function(cb){
   if(typeof(jQuery) == 'undefined'){
     var scr = document.createElement('script');
     scr.setAttribute('type', 'text/javascript');
     scr.setAttribute('src', 'http://code.jquery.com/jquery-latest.js');

     if(scr.readyState){
        scr.onreadystatechange = function(){
            if(scr.readyState === 'complete' || scr.readyState === 'loaded'){
               scr.onreadystatechange = null;
               if(cb === 'function'){
                  args = [].slice.call(arguments, 1);
                  cb.apply(this, args);
               }
            }
        };
     }
     else {
        scr.onload = function(){
           if(cb === 'function'){
              args = [].slice.call(arguments, 1);
              cb.apply(this, args);
           }
        };
     }

     var head = document.getElementsByTagName('head')[0];
     head.insertBefore(scr, head.firstChild);  
   }
}

This works cross-browser.

edit

I've updated that script as a function with a callback. Synopsis should be:

loadjQuery(function(something){
    // execute code after library was loaded & executed
});

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Well, it is quite simple to take a long javascript snippet and put it all together into one line :)

This approach takes a few lines you could mix togehter into a oneliner (but i guess you are looking for a shorter solution). You will have to eval the contents of the two script tags to load Google AJAX libraries - that is all. You might need to do a call to get the first one though.

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1. Go to the remote source (e.g.: https://ajax.googleapis.com/ajax/libs/d3js/5.7.0/d3.min.js)

2. Select all the js source (ctrl + a) and copy to the clipboard (ctrl + c)

3. Go to the target website where you want to inject the js

4. Open the console, paste the copied source and hit enter

All the functions of the library are available to you on the target website's console now.