docs: update YJSInDepth.rst

update docs of event mechanism

source/conf.py

@@ -23,7 +23,6 @@ author = 'Peking University'
 # The full version, including alpha/beta/rc tags
 release = 'V1.0'
 
-
 # -- General configuration ---------------------------------------------------
 
 # Add any Sphinx extension module names here, as strings. They can be
@@ -31,9 +30,9 @@ release = 'V1.0'
 # ones.
 
 html_theme = "sphinx_rtd_theme"
-html_logo="_static/imgs/logo.png"
+html_logo = "_static/imgs/logo.png"
 html_theme_options = {
-'logo_only': True
+    'logo_only': True
 }
 
 source_parsers = {
@@ -49,9 +48,9 @@ source_suffix = ['.rst', '.md']
 # }
 
 extensions = [
-	'recommonmark',
-	'sphinx_rtd_theme',
-	'sphinx_markdown_tables'
+    'recommonmark',
+    'sphinx_rtd_theme',
+    'sphinx_markdown_tables'
 ]
 
 html_favicon = "_static/imgs/favicon.ico"
@@ -70,13 +69,12 @@ language = 'zh_CN'
 # This pattern also affects html_static_path and html_extra_path.
 exclude_patterns = []
 
-
 # -- Options for HTML output -------------------------------------------------
 
 # The theme to use for HTML and HTML Help pages.  See the documentation for
 # a list of builtin themes.
 #
-#html_theme = 'alabaster'
+# html_theme = 'alabaster'
 
 # Add any paths that contain custom static files (such as style sheets) here,
 # relative to this directory. They are copied after the builtin static files,