Scripts
Encapsulates a compiled program
JSScript *script = JS_CompileFile(cx, obj, filename);
JSObject *obj = JS_NewScriptObject(cx, script);
JS_CompileScriptForPrincipals, JS_CompileUCScript,
JS_CompileUCScriptForPrincipals, JS_CompileFile,
JS_NewScriptObject, JS_DestroyScript