为微软的文本转语音服务的 demo 页面添加下载按钮
Script error in [Greasemonkey 脚本 https://greasyfork.org/users/909438/Azure Speech Download；版本 1.0.0]:
TypeError: window.Acom is undefined Azure Speech Download:568:19
user-script:https://greasyfork.org/users/909438/Azure Speech Download:568
firefox报这个错误，chrome正常（
报错TypeError: window.Acom is undefined