要启用 Twig 调试，您需要复制（“default.services.yml”）并将其重命名为“services.yml”。并将“debug: false”设置为true。
例如：services.yml
parameters:
session.storage.options:
# Default ini options for sessions.
#
# Some distributions of Linux (most notably Debian) ship their PHP
# installations with garbage collection (gc) disabled. Since Drupal depends
# on PHP's garbage collection for clearing sessions, ensure that garbage
# collection occurs by using the most common settings.
# @default 1
gc_probability: 1
# @default 100
gc_divisor: 100
#
# Set session lifetime (in seconds), i.e. the time from the user's last
# visit to the active session may be deleted by the session garbage
# collector. When a session is deleted, authenticated users are logged out,
# and the contents of the user's $_SESSION variable is discarded.
# @default 200000
gc_maxlifetime: 200000
#
# Set session cookie lifetime (in seconds), i.e. the time from the session
# is created to the cookie expires, i.e. when the browser is expected to
# discard the cookie. The value 0 means "until the browser is closed".
# @default 2000000
cookie_lifetime: 2000000
#
# Drupal automatically generates a unique session cookie name based on the
# full domain name used to access the site. This mechanism is sufficient
# for most use-cases, including multi-site deployments. However, if it is
# desired that a session can be reused across different subdomains, the
# cookie domain needs to be set to the shared base domain. Doing so assures
# that users remain logged in as they cross between various subdomains.
# To maximize compatibility and normalize the behavior across user agents,
# the cookie domain should start with a dot.
#
# @default none
# cookie_domain: '.example.com'
#
twig.config:
# Twig debugging:
#
# When debugging is enabled:
# - The markup of each Twig template is surrounded by HTML comments that
# contain theming information, such as template file name suggestions.
# - Note that this debugging markup will cause automated tests that directly
# check rendered HTML to fail. When running automated tests, 'debug'
# should be set to FALSE.
# - The dump() function can be used in Twig templates to output information
# about template variables.
# - Twig templates are automatically recompiled whenever the source code
# changes (see auto_reload below).
#
# For more information about debugging Twig templates, see
# https://www.drupal.org/node/1906392.
#
# Not recommended in production environments
# @default false
debug: true
# Twig auto-reload:
#
# Automatically recompile Twig templates whenever the source code changes.
# If you don't provide a value for auto_reload, it will be determined
# based on the value of debug.
#
# Not recommended in production environments
# @default null
auto_reload: null
# Twig cache:
#
# By default, Twig templates will be compiled and stored in the filesystem
# to increase performance. Disabling the Twig cache will recompile the
# templates from source each time they are used. In most cases the
# auto_reload setting above should be enabled rather than disabling the
# Twig cache.
#
# Not recommended in production environments
# @default true
cache: true
renderer.config:
# Renderer required cache contexts:
#
# The Renderer will automatically associate these cache contexts with every
# render array, hence varying every render array by these cache contexts.
#
# @default ['languages:language_interface', 'theme', 'user.permissions']
required_cache_contexts: ['languages:language_interface', 'theme', 'user.permissions']
# Renderer automatic placeholdering conditions:
#
# Drupal allows portions of the page to be automatically deferred when
# rendering to improve cache performance. That is especially helpful for
# cache contexts that vary widely, such as the active user. On some sites
# those may be different, however, such as sites with only a handful of
# users. If you know what the high-cardinality cache contexts are for your
# site, specify those here. If you're not sure, the defaults are fairly safe
# in general.
#
# For more information about rendering optimizations see
# https://www.drupal.org/developing/api/8/render/arrays/cacheability#optimizing
auto_placeholder_conditions:
# Max-age at or below which caching is not considered worthwhile.
#
# Disable by setting to -1.
#
# @default 0
max-age: 0
# Cache contexts with a high cardinality.
#
# Disable by setting to [].
#
# @default ['session', 'user']
contexts: ['session', 'user']
# Tags with a high invalidation frequency.
#
# Disable by setting to [].
#
# @default []
tags: []
# Cacheability debugging:
#
# Responses with cacheability metadata (CacheableResponseInterface instances)
# get X-Drupal-Cache-Tags and X-Drupal-Cache-Contexts headers.
#
# For more information about debugging cacheable responses, see
# https://www.drupal.org/developing/api/8/response/cacheable-response-interface
#
# Not recommended in production environments
# @default false
http.response.debug_cacheability_headers: false
factory.keyvalue:
{}
# Default key/value storage service to use.
# @default keyvalue.database
# default: keyvalue.database
# Collection-specific overrides.
# state: keyvalue.database
factory.keyvalue.expirable:
{}
# Default key/value expirable storage service to use.
# @default keyvalue.database.expirable
# default: keyvalue.database.expirable
# Allowed protocols for URL generation.
filter_protocols:
- http
- https
- ftp
- news
- nntp
- tel
- telnet
- mailto
- irc
- ssh
- sftp
- webcal
- rtsp
# Configure Cross-Site HTTP requests (CORS).
# Read https://developer.mozilla.org/en-US/docs/Web/HTTP/Access_control_CORS
# for more information about the topic in general.
# Note: By default the configuration is disabled.
cors.config:
enabled: false
# Specify allowed headers, like 'x-allowed-header'.
allowedHeaders: []
# Specify allowed request methods, specify ['*'] to allow all possible ones.
allowedMethods: []
# Configure requests allowed from specific origins.
allowedOrigins: ['*']
# Sets the Access-Control-Expose-Headers header.
exposedHeaders: false
# Sets the Access-Control-Max-Age header.
maxAge: false
# Sets the Access-Control-Allow-Credentials header.
supportsCredentials: false