Function Code for dynamically loading external javascript files _ javascript tips-js tutorial

Share the function code of loading external javascript files dynamically, and make a record for easy searching. The Code is as follows:

(Function (clover ){
Clover. loadScript = function loadScript (url, callback ){
Var heads = document. getElementsByTagName ('head ');
If (heads. length = 0 ){
Alert ("page must have one head element ");
}
Var head = heads [0];
Var script = document. createElement ('script ');
Script. type = 'text/javascript ';
Script. src = url;
// Most browsers
Script. onload = callback;
// IE 6 & 7
Script. onreadystatechange = function (){
If (this. readyState = 'complete '){
Callback ();
}
}
Head. appendChild (script );
}

}) (Window. clover = window. clover | | {});

// Sample
// Clover. loadScript ("http://ajax.googleapis.com/ajax/libs/jquery/1.6.2/jquery.min.js? 1.1.23 ");