在 VS Code 属性设置中找到 User Snippets，新建全局代码片段。
例如：创建名为 flask-jinja.code-snippets 自定义全局代码片段
{
// Place your global snippets here. Each snippet is defined under a snippet name and has a scope, prefix, body and
// description. Add comma separated ids of the languages where the snippet is applicable in the scope field. If