cgm meaning

page confusion, commonly used in the EM table as followsAt this time someone and I will complain, my maths is taught by the P.E. teacher, divided by 16 how can I figure out, that's good you can redefine the base font size html {font-size:62.5%} on the root node But it is! But, but! Again, EM is accurate relative to the parent node's font size to calculate, if you define the font size then relative to the size of their own to calculate, for example, as follows:HTML {font-size:100%;}. box-0 {

The security switch mainly uses the access control list to implement the security function of the packet filtering firewall. It enhances the security protection capability and is the first choice for small and medium-sized enterprises. Vswitches play an important role in the enterprise network, usually the core of the entire network. In the network era where hackers are intruding into the cloud and the virus is raging, the core security switch also takes responsibility for network security. Ther

security really needs to "arm your teeth ". Meaning of layer-3 Security Switch The most important role of a vswitch is to forward data. In the case of hacker attacks and virus intrusion, The vswitch must be able to maintain its efficient data forwarding rate without being disturbed by attacks, this is the most basic security function required by the vswitch. At the same time, as the core of the entire network, vswitches should be able to differentiat

You may find that there is a sentence in the code written by someone else: var = this; What does that mean?In JavaScript, this represents the current object.var that=this is a copy of the current this object into that variable. What is the point of doing this?$ (' #zhetenga '). Click (function () {This is the #zhetenga that is clickedvar = this;$ ('. Zhetenga '). each (function () {This is the current object in the. Zhetenga loopThat's still the #zhetenga that was just clicked});});As you can se

Undefined is a global property that indicates that no assignment has been defined or defined.Void is a unary operator that returns undefined no matter what parameters are passed in.The void operator is defined in ECMAScript V1, and undefined is defined in ECMAScript v5. We know that undefined is not a reserved word for JavaScript, so we can use undefined as the variable name. At this point, the undefined we define will affect the use of undefined as a judgment place . Look at the following examp

recorded in the subtable. Therefore, the above can be omitted on DELETE restrict. Non-default action-cascade update: When the parent table updates the primary key, if the child table has a corresponding record, the child table is automatically updated. This action is implemented by ON update cascade. Non-default action-cascade deletion: When the parent table updates the primary key, if the child table has a corresponding record, the child table is automatically updated. This operation is implem

Fromhttp://dev.csdn.net/article/60/60902.shtmMeta is the response header message used to simulate an HTTP protocol in an HTML document. Meta tags are used in Name property1, 2, 3, 4, 5, The properties are described as follows:Set to all: The file will be retrieved and the link on the page can be queried;Set to None: The file will not be retrieved, and the link on the page cannot be queried;Set to index: The file will be retrieved;Set to follow: links on the page can be queried;Set to NOINDEX: Th

as dependency intervention) is that you do not create objects, but describe how they are created. The code does not directly connect to objects and services, but describes in the configuration file which component requires which service. Containers (which are IOC containers in the Spring framework) are responsible for linking these together. in a typical IOC scenario, the container creates all the objects and sets the necessary properties to connect them together, deciding when to invoke the me

Box-shadow: Shadow offset value (preferably positive or negative), shadow vertical offset value (positive or negative value); shadow blur value; Shadow colorFirefox supports box shadow:-moz-box-shadow:2px 2px 5px #333;WebKit kernel's Safari and chrome support box shadow:-webkit-box-shadow:2px 2px 5px #333;Opera supports box shadow:box-shadow:2px 2px 5px #333;IE does not support box Shadow;Knowledge Expansion:Gecko (used by Firefox browser)WebKit (developed by Safari Apple, chrome use)Trident (us

Meaning of =) in oracle function parameters Today we see an MD5 encryption problem. Many languages provide encryption functions. oracle also provides MD5 encryption functions. I searched the internet and the encryption function is: DBMS_OBFUSCATION_TOOLKIT.MD5 (input_string => 'abc ') However, the parameter contains a "=>" symbol. What does this symbol mean? There are two ways for oracle Real-time participation parameters: 1. One isLocation Metho

All said not to write articles is not technical cattle people, next! To record my rookie growth course! The scope of a variable is something that every programmer must consider, but in PHP it's a lot different from C + +! For example, the function inside and outside if the same variable name, but cannot be overwritten, want to refer to variables outside the function, need to use global. Next, look at the following demo: $num =10; function Test() { $num = $num*10; } Test (); Echo $num;

contents of the header. For example: "Keep-alive". $_server[' http_host '///Current requested HOST: The contents of the header. $_server[' http_referer '//link to the URL address of the previous page of the current page. $_server[' http_user_agent '///user_agent of the current request: the contents of the header. $_server[' https ']//if accessed via HTTPS, is set to a non-null value (on), otherwise it returns off $_server[' Script_filename '] #当前执行脚本的绝对路径名. $_server[' server_admin '] #管理员信息 $_s

uppercase and lowercase alphanumeric and underscores equivalent ([0-9a-zA-Z]) (drawn from the Classic tutorial regular expression 30-minute introductory tutorial) But in practice, it's not the case, it can be said that it's not just about the ([0-9a-zA-Z_]) data, Here is the test tool for EditPlus: The actual addition ([0-9a-zA-Z_]) also contains the Greek alphabet, Russian letters, etc.; So if you need to pay attention to the specific matching data when registering the user information, you

assignment with will copy this instance (such as an object) and $this will act on the copy, which is not always the desired result. Because of problems with performance and memory consumption, usually you just want to work on one instance.Although you can use the @ operator to close any error messages in the constructor, such as @new, this does not work with the new statement. This is a limitation of the Zend engine and can result in a parsing error.The second thing a reference does is pass a

This article mainly for you in detail the PHP read text files commonly used 4 ways and str_replace in the parameters of the meaning of not commonly used, with a certain reference value, interested in small partners can refer to Seemingly simple things, but it is likely that you do not know enough to know more of course you will not find it complicated, but you know more than others. Like our usual file_get_contents we often use it to fetch a URL cont

When we use the Internet, we often say that the IP address is Internet Protocol. Internet protocol. In order to better understand this knowledge, we have summarized and sorted out the basic content. Now let's take a look at the specific meaning of the IP protocol. Internet Protocol) Cause The Internet protocol is used to connect multiple Packet Exchange Networks. Before the Source and Destination addresses, it transmits something called a datagram. It

create an assembly name and get the various parts of an assembly name. Public instance properties: such as CultureInfo, FullName, KeyPair, name, and version. This class provides several public instance methods, such as Getpublickey, Getpublickeytoken, Setpublickey, and Setpublickeytoken.Viii. OtherThe metadata identifier is a 4-byte numeric value whose high byte represents the type of token (0x01 = TypeRef, 0x02 =typedef, 0x26 = filedef, 0x27 = ExportedType)To make the C # assembly that we crea

I stepped on a hole today.Math.Round () function rounding found wrong, 3/2 = 2, 5/2 = 2Search the Internet: http://www.cnblogs.com/fanyong/archive/2013/05/30/chinese_round.htmlMath.Round () in C # is not a "rounding" method used. In fact, in VB, VBScript, C #, J #, T-SQL round functions are used banker ' s rounding (banker algorithm), namely: four six into the five to take the pair. In fact, this is also an IEEE specification, so all IEEE compliant languages should adopt such an algorithm.Starti

Tag: operation cannot arithmetic condition style description size Pre UnionA?b:cThis is a conditional expression, which means that if a is true, the expression value is B, and if A is false, the expression value is CThe conditional expression is specified as followsConditional statements:if (a>b) max=A; else max=b;An available conditional expression is written asmax= (a>b) a:b;The semantics for executing the statement are: If A>b is true, assign a to max, otherwise assign B to max.When you use c

views are changed accordingly. With the URL function, it becomes:Httpresponseredirect (Reverse ("News_index"))The benefits are the same as those used in the template.When encountering a urlpatterns address that contains parameters, such as:(R ' ^ (? PThere are two parameters, the final address such as the archived address http://www.baoyalv.com/2010/02The situation becomes more complicated, and the usage of urlpatterns is the same:URL (r ' ^ (? PThe use of templates needs to be changed, we rega