踩了很多坑，记录一下

1.Edit->Preference->External tools->External Script Editor 里面选vscode的.exe文件,下面的框框全点上
2.双击unity里的script文件，就会直接跳转到vscode
3.在vscode里面下插件（c#），网上还有其他一些插件也可以用
4.安装.NET SDK，然后在文件->首选项-> 设置->搜索 use -> 勾选Omnisharp:Use Modern Net
5.重进vscode ，如果输出控制台有下面的报错，

The reference assemblies for framework ".NETFramework,Version=v4.7.1" were not found. To resolve this, install the SDK or Targeting Pack for this framework version or retarget your application to a version of the framework for which you have the SDK or Targeting Pack installed. Note that assemblies will be resolved from the Global Assembly Cache (GAC) and will be used in place of reference assemblies. Therefore your assembly may not be correctly targeted for the framework you intend.

说明就没有Version=v4.7.1的.NET Framework，在网址（https://dotnet.microsoft.com/download/thank-you/net452-developer-pack）里下一个他缺的版本就行了，然后安装，安装完成后将他的安装地址（C:\Program Files (x86)\Reference Assemblies\Microsoft\Framework.NETFramework\v4.7.1）配置在本地的path里就行了。