将socket.io加载到JavaScriptCore for iOS中

I'm writing an iOS/JavaScriptCore app that calls code from a Javascript file. My Javascript code depends on the 'io' variable created by importing socket.io.js. The Javascript all works fine when loaded from an HTML file, but when I load socket.io.js into JavaScriptCore the io variable is not defined and my own Javascript can't run.I'm writing an iOS/JavaScriptCore app that call