sit(a, "action", "android.intent.action.SEND") 
sit(a, "type", "text/plain") 
sit(a, "extra", "android.intent.extra.SUBJECT", "分享软件")
sit(a, "extra", "android.intent.extra.TEXT", "这里写内容")
sit(a, "flags", 268435456)
uit(a, "chooser", "标题")
//按照中文的提示来写
//可放在载入事件 按钮点击事件等