sit(a,"action","android.intent.action.SENDTO") 
sit(a,"type","vnd.android-dir/mms-sms")
sit(a, "data", "smsto:10086") 
//10086为发短信号码
sit(a,"extra","sms_body","短信内容")
//以上为短信内容
uit(a, "chooser", "发短信")