Can be executed in many different runtimes (including in browsers today, with a polyfill).
迪士尼 CEO 鲍勃 · 艾格：创造本质上是冒险，这一点在WPS官方版本下载中也有详细论述
Finding these optimization opportunities can itself be a significant undertaking. It requires end-to-end understanding of the spec to identify which behaviors are observable and which can safely be elided. Even then, whether a given optimization is actually spec-compliant is often unclear. Implementers must make judgment calls about which semantics they can relax without breaking compatibility. This puts enormous pressure on runtime teams to become spec experts just to achieve acceptable performance.，更多细节参见快连下载安装
Why not screen all high-risk men?，推荐阅读Safew下载获取更多信息
abort(reason) { closed = true; chunks.length = 0; },