Example of asynchronous loading of javascript loadScript

I. Syntax:
LoadScript (url [, callback])
Or
LoadScript (settings)
2. Parameters supported by settings:
Url: script path
Async: asynchronous or not. The default value is false (HTML5)
Charset: file encoding
Cache: whether to cache. The default value is true.
Success: the function that is executed after the load is successful. callback is executed first.
Iii. Call example:
Copy codeThe Code is as follows:
// LoadScript (url [, callback])
LoadScript ("http://code.jquery.com/jquery.js ");
LoadScript ("http://code.jquery.com/jquery.js#,function (){
Console. log (1)
});
// LoadScript (settings)
LoadScript ({"url": "parts });
LoadScript ({"url": "loads (){
Console. log (2)
}});
// Or you can set the sauce purple:
// LoadScript (settings [, callback])
LoadScript ({"url": "http://code.jquery.com/jquery.js?,?async=:false,?charset=:=8}},function (){
Console. log ($)
});

4. Source Code:
Copy codeThe Code is as follows:
Function loadScript (url, callback ){
Var head = document. head | document. getElementsByTagName ("head") [0] | document.doc umentElement,
Script,
Options,

If (typeof url = "object "){
Options = url;
Url = undefined;
}
S = options | {};
Url = url | s. url;
Callback = callback | s. success;
Script = document. createElement ("script ");
Script. async = s. async | false;
Script. type = "text/javascript ";
If (s. charset ){
Script. charset = s. charset;
}
If (s. cache = false ){
Url = url + (/\? /. Test (url )? "&": "?" ) + "_ =" + (New Date (). getTime ();
}
Script. src = url;
Head. insertBefore (script, head. firstChild );
If (callback ){
Document. addEventListener? Script. addEventListener ("load", callback, false): script. onreadystatechange = function (){
If (/loaded | complete/. test (script. readyState )){
Script. onreadystatechange = null
Callback ()
}
}
}
}