run WebAssembly Standalone type report TypeError

参照书中第5章5.2.1，构建Standalone类型的 wasm，在火狐和google浏览器中运行生成的html文件，报 TypeError: exportFuncAdd is not a function。

但是直接使用你在git上提供的 html 和 wasm，却能正常运行。书中的编译命令
emcc emscripten-standalone.cc -Os -s WASM=1 -o emscripten-standalone.js ，不知道是不是emcc 版本问题，还是编译方式需要调整？

我的emcc 版本为
emcc (Emscripten gcc/clang-like replacement) 1.38.31 (commit 55ad1c4502293cc0f6ce8d5a249c941eee604269)

Start with the standalone example and the documented command `emcc emscripten-standalone.cc -Os -s WASM=1 -o emscripten-standalone.js`. Reproduce the generated HTML in Firefox and Google Chrome using Emscripten 1.38.31, then compare it with the repository's provided HTML and WASM; done means identifying whether the TypeError is caused by the compiler version or the build command.

Written by the indexing model from the issue text.