script.createCachedData()

• 返回：<Buffer>

  ¥Returns: <Buffer>

创建可与 Script 构造函数的 cachedData 选项一起使用的代码缓存。返回 Buffer。此方法可以随时调用任意次数。

¥Creates a code cache that can be used with the Script constructor's cachedData option. Returns a Buffer. This method may be called at any time and any number of times.

Script 的代码缓存不包含任何 JavaScript 可观察状态。代码缓存可以安全地与脚本源一起保存，并用于多次构造新的 Script 实例。

¥The code cache of the Script doesn't contain any JavaScript observable states. The code cache is safe to be saved along side the script source and used to construct new Script instances multiple times.

Script 源代码中的函数可以标记为延迟编译，并且在构建 Script 时不会编译它们。这些函数将在第一次调用时被编译。代码缓存序列化 V8 目前知道的关于 Script 的元数据，它可以用来加速未来的编译。

¥Functions in the Script source can be marked as lazily compiled and they are not compiled at construction of the Script. These functions are going to be compiled when they are invoked the first time. The code cache serializes the metadata that V8 currently knows about the Script that it can use to speed up future compilations.

const script = new vm.Script(`
function add(a, b) {
  return a + b;
}

const x = add(1, 2);
`);

const cacheWithoutAdd = script.createCachedData();
// In `cacheWithoutAdd` the function `add()` is marked for full compilation
// upon invocation.

script.runInThisContext();

const cacheWithAdd = script.createCachedData();
// `cacheWithAdd` contains fully compiled function `add()`. 拷贝