v8.cachedDataVersionTag()

• 返回：<integer>

返回一个整数，表示从 V8 版本、命令行标志和检测到的 CPU 功能派生的版本标签。这对于确定某个 vm.Script cachedData 缓冲区是否与此 V8 实例兼容非常有用。

【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