Assuming that both of these approaches load the script properly, and that I wait the appropriate amount of time before using the script (and/or use a callback), what are the major differences between these approaches.
Note: I understand the first uses jQuery (which is a larger download etc.). What I'm really interested in is the after affects of these approaches. Does one place the script in a different scope than the other? Etc.
jQuery:
function loadScript() {
$.getScript('http://www.mydomain/myscript.js');
}
Appending to body:
function loadScript() {
var script= document.createElement('script');
script.type= 'text/javascript';
script.src= 'http://www.mydomain/myscript.js';
script.async = true;
document.body.appendChild(script);
}
Appending to head:
function loadScript() {
var head= document.getElementsByTagName('head')[0];
var script= document.createElement('script');
script.type= 'text/javascript';
script.src= 'http://www.mydomain/myscript.js';
script.async = true;
head.appendChild(script);
}
jQuery appends the script
element to head
if present, or to document
element otherwise. Under the hood the code is similar. The final result will be the same: both approaches execute new code in the global scope.
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