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achieve this effect. (For the optimization speed, the actual application can be used in a small part. Some people may say that, one more image is used.What about HTTP requests ......)A good example is that during the 512 earthquake this year, many websites all turned gray overnight. They only used a line of CSS code:Program code body{filter: gray;} However, you will see that these web pages are very slow, and your CPU will soar when you open them. It

SELECT * from employee where 1 = 2 3, Pay attention to transactions and locks Transactions are important tools in database applications. They have four attributes: atomicity, consistency, isolation, and persistence. We need to use transactions to ensure data correctness for many operations. When using transactions, we need to avoid deadlocks and minimize blocking. Pay special attention to the following asp

";Script>Body>HTML>(JavaScript is performed by a Web browser.) In this case, the browser will access the HTML element of id= "demo" and replace its contents (InnerHTML) with "My first JavaScript". ）Write to document outputThe following example writes the HTML document output: DOCTYPE HTML>HTML>Body>H1>My First Web PageH1>Script>document.write ("");Script>Body>HTML>WarningPlease use document.write () to write only to the document output. If document.write is executed after the document has finish