v8.cachedDataVersionTag()

• 返回：<integer>

  ¥Returns: <integer>

返回表示从 V8 版本、命令行标志、以及检测到的 CPU 特性派生的版本标签的整数。这对于判断 vm.Script cachedData 缓冲区是否与此 V8 实例兼容很有用。

¥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.

console.log(v8.cachedDataVersionTag()); // 3947234607
// The value returned by v8.cachedDataVersionTag() is derived from the V8
// version, command-line flags, and detected CPU features. Test that the value
// does indeed update when flags are toggled.
v8.setFlagsFromString('--allow_natives_syntax');
console.log(v8.cachedDataVersionTag()); // 183726201 拷贝