s id=3
//toolbar的id
utb(id)
java(mTba, activity, "android.support.v7.app.AppCompatActivity.getSupportActionBar")
java(null, mTba, "android.support.v7.app.ToolbarActionBar.setDisplayHomeAsUpEnabled", "boolean", true)
//设置左边为返回键
utb("set", "leftck", id)
{
  tw("返回")
}