NativeScript runs JavaScript on a JavaScript VM • JavaScriptCore on iOS • V8 on Android • JavaScriptCore on Windows • Runs on V8 • Runs on JavaScriptCore Gathering Native APIs • NativeScript uses • V8/JavaScript Core have APIs to inject global variables Invoking native APIs • V8/JavaScriptCore have C++ callbacks for JS function calls and property accesses. • The NativeScript runtime

output: JavaScript NativeScript iOS Example JavaScript Runs on V8 JavaScript VM Runs on JavaScriptCore VM NativeScript Module Layer (NML) o Abstractions on native APIs provide unified, cross-platform

@rowdyrabouw 23/120 NativeScript Runtime 4 Runs on JavaScript Virtual Machines 4 V8 (Android) 4 JavaScriptCore (iOS) 4 Executes C++ code to invoke native code 4 Uses reflection to generate metadata 4 Examines

API 以及 macOS Cocoa frameworks 的能力，这意味着除了标准的 JavaScript 库外，还可以使用许多很棒 的类与函数。CocoaScript 建立在苹果的 JavaScriptCore 之上，而 JavaScript- Core 是为 Safari 提供支持的 JavaScript 引擎。 因此，当你使用 CocoaScript 编写代码的时候，你就是在写 JavaScript。Co-