win7下声音图标消失的解决办法

var o = Ext.util.Observable.prototype;

// This is the function we will be executing <b>before</b> the real fireEventMethod.
// It will be passed all the same argments, and has the same scope (this reference).
// Log the firer, the event name, and the arguments to the console.

function fireEventInterceptor(evt) {
var a = arguments;
var msg = "fired the following event {0} with args";

//console.log(this);
console.log(String.format(msg, evt));
console.log(Array.prototype.slice.call(a, 1, a.length));
// console.log(a.slice( 1, a.length));
}

// Set the class's fireEvent to be our interceptor.
o.fireEvent = o.fireEvent.createInterceptor(fireEventInterceptor);