var email=null; email?: println("email is empty"); email?.let{ println("emali not empty"); } var current= email?.let { "nihao" }?:"not i fuck i am null"; println("current var ${current}"); 【本文转自：韩国服务器 http://www.558idc
var email=null;【本文转自：韩国服务器 http://www.558idc.com/kt.html提供,感谢支持】
email?: println("email is empty");
email?.let{
println("emali not empty");
}
var current= email?.let { "nihao" }?:"not i fuck i am null";
println("current var ${current}");