$(this).parent().toggleClass('have-submenu-opened');我必须确定：
$(this).parent().find(".sub-menu").toggleClass("display-on");
将运行并在之前完成：
func getAvailableCoins() {
var coins = [Coin]?()
httpClient.getRequest("http://shapeshift.io/getcoins", completion: { data in
coins = self.shapeShiftService.availableCoins(data)
coinsAreReady(coins)
})
}
func coinsAreReady(coins: [Coin]?) {
//do what you need with your coins here
}