uWebSockets的使用

### Windows

Prerequisites:

* [Python 2.6 or 2.7][] as it is required
  by [GYP][].
  If python is not in your path, set the environment variable `PYTHON` to its
  location. For example: `set PYTHON=C:\Python27\python.exe`
* One of:
  * [Visual C++ Build Tools][]
  * [Visual Studio 2015 Update 3][], all editions
    including the Community edition (remember to select
    "Common Tools for Visual C++ 2015" feature during installation).
  * [Visual Studio 2017][], any edition (including the Build Tools SKU).
    **Required Components:** "MSbuild", "VC++ 2017 v141 toolset" and one of the
    Windows SDKs (10 or 8.1).
* Basic Unix tools required for some tests,
  [Git for Windows][] includes Git Bash
  and tools which can be included in the global `PATH`.

To build, launch a git shell (e.g. Cmd or PowerShell), run `vcbuild.bat`
(to build with VS2017 you need to explicitly add a `vs2017` argument),
which will checkout the GYP code into `build/gyp`, generate `uv.sln`
as well as the necesery related project files, and start building.

```console
> vcbuild
```

Or:

```console
> vcbuild vs2017
```

To run the tests:

```console
> vcbuild test
```

To see all the options that could passed to `vcbuild`:

```console
> vcbuild help
vcbuild.bat [debug/release] [test/bench] [clean] [noprojgen] [nobuild] [vs2017] [x86/x64] [static/shared]
Examples:
  vcbuild.bat              : builds debug build
  vcbuild.bat test         : builds debug build and runs tests
  vcbuild.bat release bench: builds release build and runs benchmarks

echo git clone https://chromium.googlesource.com/external/gyp build/gyp
@git clone https://chromium.googlesource.com/external/gyp build/gyp
if errorlevel 1 goto gyp_install_failed
goto have_gyp