What are the advantages and disadvantages of javascript compared with vbscript? Vbscript is basically dead.
Javascript is developing in full swing.
Is a dynamic scripting language for pages.
What are the advantages and disadvantages of PROFINET compared with PROFINET? The communication buses PROFINET and PROFIBUS of Siemens TIA automation began to exist, and Profinet will not replace PROFIBUS.
PROFINET and PROFIBUS are not comparable in a narrow sense. So we can only compare the differences in application between them in a broad sense.
The most prominent feature of PROFINET is real-time. From process automation to factory automation to motion control, its timeliness can meet various applications, and PROFIBUS can also achieve the above functions. However, when real-time performance is required, especially in motion control, its efficiency can't be compared with PROFINET. Its minimum real-time period is 250us, and the jitter is less than 1us.
Another outstanding feature of PROFINET is Ethernet, which can transmit TCP or it data or data, voice, video and other data at the same time, which is incomparable to PROFIBUS. Moreover, because diagnosis is more flexible in Ethernet, SNMP protocol and HTTP protocol can diagnose PN devices and obtain diagnostic information. Access the devices you need to connect anytime, anywhere from anywhere on the network or through WLAN. In addition, for the network expansion kit, PROFIBUS can only add OLM or repeater mechanically, and the location of addition is mostly fixed, and its disadvantage is especially reflected in the expansion of equipment. PROFINET adopts Ethernet connection mode, adding switches and inserting network cables. This is similar to the local area network where we work. When we need to add equipment, we only need to connect to the port of the switch.
Based on the above reasons, Siemens' brand-new S7- 1200 only matches PROFINET interface, and the connection of PROFIBUS can only be seamlessly integrated through IE/PB LINK PN IO.
What's the difference between LOF and ordinary open buildings? What are the advantages and disadvantages? The main difference is that open-end funds can only apply for redemption in the primary market, while LOF funds can not only apply for redemption in the primary market, but also be licensed to trade in the secondary market like stocks.
The advantage is that the transaction cost is much lower. The total transaction amount in the secondary market is only 0.5% (the commission charged by each broker is different, and the maximum one-way commission is 0.3%, just like that of stocks), while the primary market is 1.8%.
But what people talk about most is LOF arbitrage, which is the biggest feature of LOF. Because the market price is different from the net value of the fund, if there is still a few percent arbitrage space after excluding the handling fee, someone will do it. Almost.
What is the function of prebiotic fertilizer? So far, the research on reducing the incidence of diseases by prebiotics is still in the trial stage, and a lot of experiments are needed for further exploration. At present, there are mainly the following reports: 1) increase intestinal peristalsis and reduce constipation; 2) Prevent intestinal infection and inhibit diarrhea; 3) Promote the absorption and utilization of calcium and reduce the incidence of osteoporosis; 4) reduce the contents of triglycerides and cholesterol, and reduce atherosclerosis and cardiovascular diseases; 5) Relieve insulin antagonism and reduce obesity and type 2 diabetes; 6) Reduce the incidence of cancer. -21day probiotic co-creation ~ Liu Fang lfbssc
What are the advantages and disadvantages of Div+Css and table function implementation? DIV and TABLE are not good or bad. The so-called web standard only suggests the correct use of tags, such as DIV is used for layout, and TABLE is originally used to transform two-dimensional data. Letting TABLE do what it should do doesn't mean that you can't see how awesome TABLE is on the page.
I won't talk about the benefits of using DIV typesetting, and everyone should know it better. DIV is a standard and a general trend, but it doesn't mean that all pages are suitable for it.
Domestic portals are very different from foreign portals. China netizens don't like pages with little information. When Yahoo arrived in China, the content on the page increased a lot. But in the end, after changing to a concise page, the traffic dropped too much and changed back in a few days. China's national conditions have created portals such as Sohu and Sina.
Why DIV is not suitable for them? Let me explain it one by one from several aspects:
Simplify the code:
Everyone says that the layout of DIV simplifies the code, but the code saved by replacing TABLE with DIV is occupied by CSS (styles), and most of these styles are used to control the layout of DIV. Then you will say that CSS can be reused externally. Please read on to get the answer to this question.
Reusability and downloads:
Unified use of a. css style sheet file can achieve the effect of modifying the whole site once, and the maintenance cost is lower. But please look at it from another angle. If all pages have to access a file when loading, then the daily download volume of this file, especially on the website platforms of Sohu and Sina, will reach hundreds of millions of times, which needs the support of many front-end web servers, and the cost of the background will increase a lot invisibly. If the background support is not done well, then the screen will appear on the page, and the previous work will be in vain. Many people will ask, the probability is too small. What we did was to avoid these two accidents. If an accident happens, the consequences for the portal will be unimaginable.
HTTP communication:
The unified style sheet document is in the form of external call, so that every time a page is loaded, the server will respond to the server's request one more time, which will greatly consume the front-end web server. In the past, css and js were written in front of the page for a long time (you can look at Sohu and Sina's pages, most of which are in this form), rather than as an external call, in order to avoid adding consumption to the server as much as possible.
Page cache:
Every time a user visits a page, it will be stored in the browser cache for a certain period of time to ensure that the display speed of the page can be greatly improved when the user visits the page next time. Every modification will cause the page to be downloaded again, as will every externally imported style file. If the CSS file is modified, every page of the website will be downloaded again. In the past, the style was written in the page, but the modified page needs to be downloaded again.
Compatibility:
For CSS (style sheet), not all versions of all browsers support CSS well. For example, browsers before IE5 didn't support CSS. At present, there are not a few users of browsers before using IE5, which makes it necessary to test different browser versions in the process of page making to ensure compatibility, which also invisibly increases a lot of workload (at least the time for developers I contacted to make div pages is longer than the standard time for table pages).
Crosscutting and ductility:
Crosscutting-traditional layout method divides the page into several blocks from top to bottom in order to make the page download faster, but it often happens in DIV layout pages. Because the content of each middle column or other columns is not fixed, the two columns are not adaptive at the same time, resulting in blank.
In contrast, the traditional tabular method is easier to avoid this situation.
Above we only discuss the usability of a certain technology in a certain field, not the technology itself.
Having said that, I'm not saying that DIV is a bad layout, but that we should correctly look at the role of Table in a large content-based portal, instead of following other people's suggestions. The reason why DIV layout is not applied in large websites is not that portal websites do not use DIV, but that the people inside are not forward-looking, but that it is decided by various reasons. Netease uses DIV entirely because content is not their main direction. For other portals, such a decision depends on time to verify. It's just not yet ripe.
How about Tissot touch series? What are the functions? Advantages and disadvantages? One thing is that it has many functions. There is no high imitation because it can't be imitated. The disadvantage is that some functions of the altimeter have great errors. Temperature measurement takes 20 minutes, and the maximum height difference can reach 100 meter. If you don't climb mountains outdoors often, you don't have to buy them. There are dragon commemorative money to collect.
What ingredients does curry powder contain? What's the role? Curry originated in India, and it is said that the first person who made curry was Sakyamuni. According to Indian legend, Sakyamuni first taught people how to make an elixir of life from the fruit of tree grass, and named it "curry", which was originally handed down by Sakyamuni, and later people widely spread this elixir as a seasoning for cooking. At first, this seasoning was used to remove the smell of mutton. Because a single spice can't be removed, it is cooked with a thick juice made of a variety of spice powders. Later, spices and curries were introduced to European countries where meat was the main food. In order to facilitate storage and transportation, spices are exported in the form of dry goods, and powder spices are popular so far. Ingredients: Curry, a complex of various spices, is actually an unstable complex composed of many spices. Up to 20 kinds of spices can be used to make a dish, such as cardamom, clove, fennel, cinnamon, all kinds of peppers, peppers, mint, mustard seeds, turmeric powder for coloring, and even spinach puree. These spices have their own unique aroma and taste, some are spicy and some are fragrant. Curries in different regions have different styles. Type: There are many kinds of curries, with different colors and tastes, including red, blue, yellow and white. In terms of countries, there are Indian, Sri Lankan, Thai, Singaporean and Malaysian curries. There are about ten flavors depending on the ingredients. Thai people treat curry just like Hunan people treat peppers, which can be paired with many kinds of vegetables. Generally, yellow curry is used for chicken, beef and mutton, red, yellow or cyan curry is used for seafood, and cyan curry is used for vegetables. A good curry is bright in color, smooth in taste and fragrant. Curry tastes slightly different in different countries due to different spices. For example, Indian curry is heavy, spicy and strong; Thai curry tastes delicious. The addition of coconut milk reduces the spicy taste and enhances the flavor. The extra spices such as citronella, lime, fish sauce and bay leaf make Thai curry unique. Red curry is the most popular curry in Thailand. Because of the addition of red curry sauce, it is reddish in color and spicy in taste. Thai green curry uses coriander, lime peel and other materials, so the curry is turquoise and is a famous curry in Thailand. Malaysians love to use coconut milk to reduce spicy and increase fragrance, so curry tastes more peaceful; The spices produced in Sri Lanka are of good quality, and the curry made is very fragrant, but the spicy taste is lighter than that of Indian curry. Efficacy: it is beneficial to digestion and promotes circulation. Because curry contains spicy spices, it will secrete saliva or gastric juice to improve digestion and absorption. Once the spicy spices in curry are absorbed by the human body, it will promote blood circulation, achieve the purpose of sweating and lower the body temperature. In addition, curry can also be disinfected in vivo, and most spices have the function of disinfection and sterilization after being combined with acidic solution in gastric juice. Function: It can enhance the spicy, fragrant, fishy and harmonious taste in cooking. Dry hair, dispelling cold, invigorating stomach, resolving phlegm and appetizing. Taboo: curry powder has the function of gastric acid secretion. Excessive gastric acid secretion will cause gallbladder contraction and induce biliary colic. Patients with chronic cholecystitis are contraindicated.
What are the advantages and disadvantages of Nokia 5300? Thank you 5300
disadvantaged
Phase head * * * is easy to wear.
The shell gets dirty easily. The 5300 shell was originally clean, but if you don't pay attention, the dirty marks are not easy to clean, which is very troublesome.
The battery is very low. If you listen to music, charge it every day.
There are many problems with the back cover. Some people say that the back cover is not easy to open, others say that it can't fit in and it is rough.
Pixel low 130 is no longer the mainstream.
S40 system software is rare.
superiority
The appearance is really beautiful and fashionable, which I have to admit.
Play it loudly! But easy, sonic boom ~
The music system can be much better than ordinary mobile phones.