I can't work out how to update a global variable from within YUI3.
Consider the following code:
window.myVariable = 'data-one';
var yuiWrap = YUI().use('node',function(Y) {
console.log(window.myVariable); // 'data-one'
window.myVariable = 'data-two';
console.log(window.myVariable); // 'data-two'
});
console.log(window.myVariable); // 'data-one'
Can anyone explain this to me? It's causing me a lot of trouble. Why can window.myVariable be accessed but not properly updated from within a YUI3 block?
I think it might have something to do with Closures but I don't understand why Closures should apply to the global "window" object.
Help?
The callback is not fired immediately but after something happened:
Attaches one or more modules to the YUI instance. When this is executed, the requirements are analyzed, and one of several things can happen:
- All requirements are available on the page -- The modules are attached to the instance. If supplied, the use callback is executed synchronously.
- Modules are missing, the Get utility is not available OR the 'bootstrap' config is false -- A warning is issued about the missing modules and all available modules are attached.
- Modules are missing, the Loader is not available but the Get utility is and boostrap is not false -- The loader is bootstrapped before doing the following....
- Modules are missing and the Loader is available -- The loader expands the dependency tree and fetches missing modules. When the loader is finshed the callback supplied to use is executed asynchronously.
来源:https://stackoverflow.com/questions/6034275/javascript-yui3-using-global-variables