新增于: v8.0.0
这对于判断 vm.Script cachedData 缓冲区是否与此 V8 实例兼容很有用。
Added in: v8.0.0
Returns an integer representing a "version tag" derived from the V8 version,
command line flags and detected CPU features. This is useful for determining
whether a vm.Script cachedData buffer is compatible with this instance
of V8.
