sit(a, "action", "android.intent.action.SEND")
sit(a,"classname","com.tencent.mm","com.tencent.mm.ui.tools.ShareImgUI")
sit(a, "extra", "android.intent.extra.TEXT", "测试")
uit(a, "chooser", "分享朋友")
//以上代码将会直接调用微信分享指定内容到指定好友