from flask import url_for

@app.context_processor # 上下文渲染器，给所有html添加渲染参数
def inject_url():
  data = {
    "url_for": dated_url_for,
  }
  return data

def dated_url_for(endpoint, **values):
	filename = None
  if endpoint == 'static':
    filename = values.get('filename', None)
  if filename:
    file_path = os.path.join(app.root_path, endpoint, filename)
    values['v'] = int(os.stat(file_path).st_mtime) # 取文件最后修改时间的时间戳，文件不更新，则可用缓存
    return url_for(endpoint, **values)

<link rel="stylesheet" href="{{ url_for('static', filename='css/base.css') }}" rel="external nofollow" >

if name == ‘main‘:
#静态资源修改不需要重启
app.jinja_env.auto_reload = True
app.run(debug=True)