关于jquery.lazyload.js的定义高宽问题？php安装的问题，无法载入 mysql 扩展，请检查 PHP 配置

我有个改造lazyload的方案，这需要修改lazyload的源代码，主要是加载到显示的流程的那部分，通过事先获得图片的高宽度在动态的指定img标记的width和height的值。我只谈理论：1.当页面加载完之后，首先向document里创建一个display:none隐藏的图片标记，2.当需要加载显示某图片时，先向创建的那个隐藏标记里放图片，3.写一个setInterval监听函数不停地监听读取图片的width和height（图片加载完前是读取不到的，所以需要不停地读取，直到能读取到了，说明图片也加载完成了），4.动态的指定真正要显示的图片标记的width和height值以及src，注：尽管上面的步骤中看似有两个Img标记，但事实上浏览器只会下载图片一次的，且速度和非改造的速度几乎一样，不会在视觉上有不友好的地方，因为同一个域名下如果有多个地方引用了同一个资源，浏览器会在第一次的时候做缓存，下一个用的地方会直接从本地缓存库里调用，所以没有服务器、带宽和性能损耗。

首先你需要将PHP安装目录下的php_mysql.dll和php_mysqli.dll（我的在D:\apptools\php5\ext目录下）复制到c:\windows\system32目录下，然后修改php.ini文件（需要放到c:\windows目录下），关键是extension=php_mysql.dll 和extension_dir = “D:/apptools/php5/ext“。 我的配置是这样的： [PHP] ;;;;;;;;;;; ; WARNING ; ;;;;;;;;;;; ; This is the default settings file for new PHP installations. ; By default, PHP installs itself with a configuration suitable for ; development purposes, and *NOT* for production purposes. ; For several security-oriented considerations that should be taken ; before going online with your site, please consult php.ini-recommended ; and ;;;;;;;;;;;;;;;;;;; ; About php.ini ; ;;;;;;;;;;;;;;;;;;; ; This file controls many aspects of PHP’s behavior. In order for PHP to ; read it, it must be named ’php.ini’. PHP looks for it in the current ; working directory, in the path designated by the environment variable ; PHPRC, and in the path that was defined in compile time (in that order). ; Under Windows, the compile-time path is the Windows directory. The ; path in which the php.ini file is looked for can be overridden using ; the -c argument in command line mode. ; ; The syntax of the file is extremely simple. Whitespace and Lines ; beginning with a semicolon are silently ignored (as you probably guessed). ; Section headers (e.g. [Foo]) are also silently ignored, even though ; they might mean something in the future. ; ; Directives are specified using the following syntax: ; directive = value ; Directive names are *case sensitive* - foo=bar is different from FOO=bar. ; ; The value can be a string, a number, a PHP constant (e.g. E_ALL or M_PI), one ; of the INI constants (On, Off, True, False, Yes, No and None) or an expression ; (e.g. E_ALL & ~E_NOTICE), or a quoted string (“foo“). ; ; Expressions in the INI file are limited to bitwise operators and parentheses: ; | bitwise OR ; & bitwise AND ; ~ bitwise NOT ; ! boolean NOT ; ; Boolean flags can be turned on using the values 1, On, True or Yes. ; They can be turned off using the values 0, Off, False or No. ; ; An empty string can be denoted by simply not writing anything after the equal ; sign, or by using the None keyword: ; ; foo = ; sets foo to an empty string ; foo = none ; sets foo to an empty string ; foo = “none“ ; sets foo to the string ’none’ ; ; If you use constants in your value, and these constants belong to a ; dynamically loaded extension (either a PHP extension or a Zend extension), ; you may only use these constants *after* the line that loads the extension. ; ; ;;;;;;;;;;;;;;;;;;; ; About this file ; ;;;;;;;;;;;;;;;;;;; ; All the values in the php.ini-dist file correspond to the builtin ; defaults (that is, if no php.ini is used, or if you delete these lines, ; the builtin defaults will be identical). ;;;;;;;;;;;;;;;;;;;; ; Language Options ; ;;;;;;;;;;;;;;;;;;;; ; Enable the PHP scripting language engine under Apache. engine = On ; Enable compatibility mode with Zend Engine 1 (PHP 4.x) zend.ze1_compatibility_mode = Off ; Allow the 《? tag. Otherwise, only 《?php and 《script》 tags are recognized. ; NOTE: Using short tags should be avoided when developing applications or ; libraries that are meant for redistribution, or deployment on PHP ; servers which are not under your control, because short tags may not ; be supported on the target server. For portable, redistributable code, ; be sure not to use short tags. short_open_tag = On ; Allow ASP-style 《% %》 tags. asp_tags = Off ; The number of significant digits displayed in floating point numbers. precision = 12 ; Enforce year 2000 compliance (will cause problems with non-compliant browsers) y2k_compliance = On ; Output buffering allows you to send header lines (including cookies) even ; after you send body content, at the price of slowing PHP’s output layer a ; bit. You can enable output buffering during runtime by calling the output ; buffering functions. You can also enable output buffering for all files by ; setting this directive to On. If you wish to limit the size of the buffer ; to a certain size - you can use a maximum number of bytes instead of ’On’, as ; a value for this directive (e.g., output_buffering=4096). output_buffering = On ; You can redirect all of the output of your scripts to a function. For ; example, if you set output_handler to “mb_output_handler“, character ; encoding will be transparently converted to the specified encoding. ; Setting any output handler automatically turns on output buffering. ; Note: People who wrote portable scripts should not depend on this ini ; directive. Instead, explicitly set the output handler using ob_start(). ; Using this ini directive may cause problems unless you know what script ; is doing. ; Note: You cannot use both “mb_output_handler“ with “ob_iconv_handler“ ; and you cannot use both “ob_gzhandler“ and “zlib.output_compression“. ; Note: output_handler must be empty if this is set ’On’ !!!! ; Instead you must use zlib.output_handler. ;output_handler = ; Transparent output compression using the zlib library ; Valid values for this option are ’off’, ’on’, or a specific buffer size ; to be used for compression (default is 4KB) ; Note: Resulting chunk size may vary due to nature of compression. PHP ; outputs chunks that are few hundreds bytes each as a result of ; compression. If you prefer a larger chunk size for better ; performance, enable output_buffering in addition. ; Note: You need to use zlib.output_handler instead of the standard ; output_handler, or otherwise the output will be corrupted. zlib.output_compression = Off ; You cannot specify additional output handlers if zlib.output_compression ; is activated here. This setting does the same as output_handler but in ; a different order. ;zlib.output_handler = ; Implicit flush tells PHP to tell the output layer to flush itself ; automatically after every output block. This is equivalent to calling the ; PHP function flush() after each and every call to print() or echo() and each ; and every HTML block. Turning this option on has serious performance ; implications and is generally recommended for debugging purposes only. implicit_flush = Off ; The unserialize callback function will be called (with the undefined class’ ; name as parameter), if the unserializer finds an undefined class ; which should be instantiated. ; A warning appears if the specified function is not defined, or if the ; function doesn’t include/implement the missing class. ; So only set this entry, if you really want to implement such a ; callback-function. unserialize_callback_func= ; When floats & doubles are serialized store serialize_precision significant ; digits after the floating point. The default value ensures that when floats ; are decoded with unserialize, the data will remain the same. serialize_precision = 100 ; Whether to enable the ability to force arguments to be passed by reference ; at function call time. This method is deprecated and is likely to be ; unsupported in future versions of PHP/Zend. The encouraged method of ; specifying which arguments should be passed by reference is in the function ; declaration. You’re encouraged to try and turn this option Off and make ; sure your scripts work properly with it in order to ensure they will work ; with future versions of the language (you will receive a warning each time ; you use this feature, and the argument will be passed by value instead of by ; reference). allow_call_time_pass_reference = On ; ; Safe Mode ; safe_mode = Off ; By default, Safe Mode does a UID compare check when ; opening files. If you want to relax this to a GID compare, ; then turn on safe_mode_gid. safe_mode_gid = Off ; When safe_mode is on, UID/GID checks are bypassed when ; including files from this directory and its subdirectories. ; (directory must also be in include_path or full path must ; be used when including) safe_mode_include_dir = ; When safe_mode is on, only executables located in the safe_mode_exec_dir ; will be allowed to be executed via the exec family of functions. safe_mode_exec_dir = ; Setting certain environment variables may be a potential security breach. ; This directive contains a comma-delimited list of prefixes. In Safe Mode, ; the user may only alter environment variables whose names begin with the ; prefixes supplied here. By default, users will only be able to set ; environment variables that begin with PHP_ (e.g. PHP_FOO=BAR). ; ; Note: If this directive is empty, PHP will let the user modify ANY ; environment variable! safe_mode_allowed_env_vars = PHP_ ; This directive contains a comma-delimited list of environment variables that ; the end user won’t be able to change using putenv(). These variables will be ; protected even if safe_mode_allowed_env_vars is set to allow to change them. safe_mode_protected_env_vars = LD_LIBRARY_PATH ; open_basedir, if set, limits all file operations to the defined directory ; and below. This directive makes most sense if used in a per-directory ; or per-virtualhost web server configuration file. This directive is ; *NOT* affected by whether Safe Mode is turned On or Off. ;open_basedir = ; This directive allows you to disable certain functions for security reasons. ; It receives a comma-delimited list of function names. This directive is ; *NOT* affected by whether Safe Mode is turned On or Off. disable_functions = ; This directive allows you to disable certain classes for security reasons. ; It receives a comma-delimited list of class names. This directive is ; *NOT* affected by whether Safe Mode is turned On or Off. disable_classes = ; Colors for Syntax Highlighting mode. Anything that’s acceptable in ; 《span style=“color: ???????“》 would work. ;highlight.string = #DD0000 ;highlight.comment = #FF9900 ;highlight.keyword = #007700 ;highlight.bg = #FFFFFF ;highlight.default = #0000BB ;highlight.html = #000000 ; If enabled, the request will be allowed to complete even if the user aborts ; the request. Consider enabling it if executing long request, which may end up ; being interrupted by the user or a browser timing out. ; ignore_user_abort = On ; ; Misc ; ; Decides whether PHP may expose the fact that it is installed on the server ; (e.g. by adding its signature to the Web server header). It is no security ; threat in any way, but it makes it possible to determine whether you use PHP ; on your server or not. expose_php = On ;;;;;;;;;;;;;;;;;;; ; Resource Limits ; ;;;;;;;;;;;;;;;;;;; max_execution_time = 3000 ; Maximum execution time of each script, in seconds max_input_time = 60 ; Maximum amount of time each script may spend parsing request data memory_limit = 8M ; Maximum amount of memory a script may consume (8MB) ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; ; Error handling and logging ; ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; ; error_reporting is a bit-field. Or each number up to get desired error ; reporting level ; E_ALL - All errors and warnings (doesn’t include E_STRICT) ; E_ERROR - fatal run-time errors ; E_WARNING - run-time warnings (non-fatal errors) ; E_PARSE - compile-time parse errors ; E_NOTICE - run-time notices (these are warnings which often result ; from a bug in your code, but it’s possible that it was ; intentional (e.g., using an uninitialized variable and ; relying on the fact it’s automatically initialized to an ; empty string) ; E_STRICT - run-time notices, enable to have PHP suggest changes ; to your code which will ensure the best interoperability ; and forward compatibility of your code ; E_CORE_ERROR - fatal errors that occur during PHP’s initial startup ; E_CORE_WARNING - warnings (non-fatal errors) that occur during PHP’s ; initial startup ; E_COMPILE_ERROR - fatal compile-time errors ; E_COMPILE_WARNING - compile-time warnings (non-fatal errors) ; E_USER_ERROR - user-generated error message ; E_USER_WARNING - user-generated warning message ; E_USER_NOTICE - user-generated notice message ; ; Examples: ; ; - Show all errors, except for notices and coding standards warnings ; ;error_reporting = E_ALL & ~E_NOTICE ; ; - Show all errors, except for notices ; ;error_reporting = E_ALL & ~E_NOTICE | E_STRICT ; ; - Show only errors ; ;error_reporting = E_COMPILE_ERROR|E_ERROR|E_CORE_ERROR ; ; - Show all errors except for notices and coding standards warnings ; error_reporting = E_ALL & ~E_NOTICE ; Print out errors (as a part of the output). For production web sites, ; you’re strongly encouraged to turn this feature off, and use error logging ; instead (see below). Keeping display_errors enabled on a production web site ; may reveal security information to end users, such as file paths on your Web ; server, your database schema or other information. display_errors = On ; Even when display_errors is on, errors that occur during PHP’s startup ; sequence are not displayed. It’s strongly recommended to keep ; display_startup_errors off, except for when debugging. display_startup_errors = Off ; Log errors into a log file (server-specific log, stderr, or error_log (below)) ; As stated above, you’re strongly advised to use error logging in place of ; error displaying on production web sites. log_errors = Off ; Set maximum length of log_errors. In error_log information about the source is ; added. The default is 1024 and 0 allows to not apply any maximum length at all. log_errors_max_len = 1024 ; Do not log repeated messages. Repeated errors must occur in same file on same ; line until ignore_repeated_source is set true. ignore_repeated_errors = Off ; Ignore source of message when ignoring repeated messages. When this setting ; is On you will not log errors with repeated messages from different files or ; sourcelines. ignore_repeated_source = Off ; If this parameter is set to Off, then memory leaks will not be shown (on ; stdout or in the log). This has only effect in a debug compile, and if ; error reporting includes E_WARNING in the allowed list report_memleaks = On ; Store the last error/warning message in $php_errormsg (boolean). track_errors = Off ; Disable the inclusion of HTML tags in error messages. ; Note: Never use this feature for production boxes. ;html_errors = Off ; If html_errors is set On PHP produces clickable error messages that direct ; to a page describing the error or function causing the error in detail. ; You can download a copy of the PHP manual from ; and change docref_root to the base URL of your local copy including the ; leading ’/’. You must also specify the file extension being used including ; the dot. ; Note: Never use this feature for production boxes. ;docref_root = “/phpmanual/“ ;docref_ext = .html ; String to output before an error message. ;error_prepend_string = “《font color=ff0000》“ ; String to output after an error message. ;error_append_string = “《/font》“ ; Log errors to specified file. ;error_log = filename ; Log errors to syslog (Event Log on NT, not valid in Windows 95). ;error_log = syslog ;;;;;;;;;;;;;;;;; ; Data Handling ; ;;;;;;;;;;;;;;;;; ; ; Note - track_vars is ALWAYS enabled as of PHP 4.0.3 ; The separator used in PHP generated URLs to separate arguments. ; Default is “&“. ;arg_separator.output = “&“ ; List of separator(s) used by PHP to parse input URLs into variables. ; Default is “&“. ; NOTE: Every character in this directive is considered as separator! ;arg_separator.input = “;&“ ; This directive describes the order in which PHP registers GET, POST, Cookie, ; Environment and Built-in variables (G, P, C, E & S respectively, often ; referred to as EGPCS or GPC). Registration is done from left to right, newer ; values override older values. variables_order = “EGPCS“ ; Whether or not to register the EGPCS variables as global variables. You may ; want to turn this off if you don’t want to clutter your scripts’ global scope ; with user data. This makes most sense when coupled with track_vars - in which ; case you can access all of the GPC variables through the $HTTP_*_VARS, ; variables. ; ; You should do your best to write your scripts so that they do not require ; register_globals to be on; Using form variables as globals can easily lead ; to possible security problems, if the code is not very well thought of. register_globals = On ; Whether or not to register the old-style input arrays, HTTP_GET_VARS ; and friends. If you’re not using them, it’s recommended to turn them off, ; for performance reasons. register_long_arrays = On ; This directive tells PHP whether to declare the argv&argc variables (that ; would contain the GET information). If you don’t use these variables, you ; should turn it off for increased performance. register_argc_argv = On ; When enabled, the SERVER and ENV variables are created when they’re first ; used (Just In Time) instead of when the script starts. If these variables ; are not used within a script, having this directive on will result in a ; performance gain. The PHP directives register_globals, register_long_arrays, ; and register_argc_argv must be disabled for this directive to have any affect. auto_globals_jit = On ; Maximum size of POST data that PHP will accept. post_max_size = 8M ; Magic quotes ; ; Magic quotes for incoming GET/POST/Cookie data. magic_quotes_gpc = On ; Magic quotes for runtime-generated data, e.g. data from SQL, from exec(), etc. magic_quotes_runtime = Off ; Use Sybase-style magic quotes (escape ’ with ’’ instead of \’). magic_quotes_sybase = Off ; Automatically add files before or after any PHP document. auto_prepend_file = auto_append_file = ; As of 4.0b4, PHP always outputs a character encoding by default in ; the Content-type: header. To disable sending of the charset, simply ; set it to be empty. ; ; PHP’s built-in default is text/html default_mimetype = “text/html“ ;default_charset = “iso-8859-1“ ; Always populate the $HTTP_RAW_POST_DATA variable. ;always_populate_raw_post_data = On ;;;;;;;;;;;;;;;;;;;;;;;;; ; Paths and Directories ; ;;;;;;;;;;;;;;;;;;;;;;;;; ; UNIX: “/path1:/path2“ ;include_path = “.:/php/includes“ ; ; Windows: “\path1;\path2“ include_path = “.;D:\apptools\php5\PEAR“ ; The root of the PHP pages, used only if nonempty. ; if PHP was not compiled with FORCE_REDIRECT, you SHOULD set doc_root ; if you are running php as a CGI under any web server (other than IIS) ; see documentation for security issues. The alternate is to use the ; cgi.force_redirect configuration below doc_root = ; The directory under which PHP opens the script using /~username used only ; if nonempty. user_dir = ; Directory in which the loadable extensions (modules) reside. extension_dir = “D:/apptools/php5/ext“ ; Whether or not to enable the dl() function. The dl() function does NOT work ; properly in multithreaded servers, such as IIS or Zeus, and is automatically ; disabled on them. enable_dl = On

assign /əˈsaɪn/ DJ /ə’saɪn/ KK verb to give sb sth that they can use, or some work or responsibility 分配（某物）；分派，布置（工作、任务等） ~ sth (to sb) ~ (sb) sth The two large classrooms have been assigned to us. 这两间大教室分配给了我们。 VN The teacher assigned a different task to each of the children. 老师给每个儿童布置的作业都不相同。 We have been assigned the two large classrooms. 我们分得了这两间大教室。 VNN The teacher assigned each of the children a different task. 老师给每个儿童都布置了不同的作业。 to provide a person for a particular task or position 指定；指派 ~ sb (to sth/as sth) They’ve assigned their best man to the job. 他们指派了最优秀的人担任这项工作。 VN British forces have been assigned to help with peacekeeping. 英国军队被派遣协助维持和平。 VN to inf. to send a person to work under the authority of sb or in a particular group 委派；派遣 VN usually passive ~ sb to sb/sth I was assigned to B platoon. 我被派到 B 排工作。 to say that sth has a particular value or function, or happens at a particular time or place 确定（价值、功能、时间、地点） ~ sth to sth Assign a different colour to each different type of information. 给每类信息分别确定一种颜色。 VN The painting cannot be assigned an exact date. 这幅画的年代确定不了。 VNN to say that your property or rights now belong to sb else 转让，让与（财产、权利） VN ~ sth to sb law The agreement assigns copyright to the publisher. 协议规定将版权转让给出版商。