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selector: directly based on the ID, CSS class name, element name to return the matching DOM elements. 2, hierarchical selector: Also known as the path selector, you can select the corresponding DOM element according to the path hierarchy. 3. Filter selector: Filter the relevant conditions on the previous basis to get the matching DOM elements. Question: Use jquery to set all the element borders on the page to a 2px wide dashed line? Answer: This is the time for the jquery selector to play, the

.equals (S2));Enter false because S2 is not of type string, and the Equals method of string is type-judged.3. What does the following code enter?"ABC"; String ("abc"); S2.intern (); System.out.println (S1 ==s2); The output False,intern () method returns a reference to the string object from the string pool, but since we have not assigned to S2,S2 no change, if the third line of code is S2 =S2.intern (), enter true.4. The following code will create several string objects.String ("Hello"); Stri

conserve bandwidth and the stability of script references, we use jquery files on the CDN, such as Google's jquery CDN service. However, if the jquery service on these cdns is not available, we can also switch to the jquery version of the local server by using the following code:HTML code --------------------------------------------------I'm a split line-------------------------------------------------------------- 6, how to use jquery implementation Click Button Pop up a dialog box?Answer: The

. Combining these two technologies with SVM is one of the reasons why SVM classifier is simple and powerful.Problem description A Gaussian core is usedTraining SVM (Support Vector machine), the test proves that if there are no two points in the same position in a given training set, there is a set of parameters {α1, ... αm, b} and parameter gamma make the SVM training error of 0. If we use the parameter gamma in question 1 to train a SVM that does not join the relaxation variable, w

The problem with Python exercises is as follows:Summary: The bonus paid by the enterprise is based on the profit commission. Profit (I) less than or equal to $100,000, the bonus can be raised by 10%, the profit is higher than $100,000, less than $200,000, the portion of less than 100,000 yuan by 10% commission, higher than the portion of 100,000 yuan, a commission of 7.5%, 200,000 to 400,000, higher than 200,000 yuan, can commission 5% , between 400,000 and 600,000 is higher than the portion of

problem is if the elements in the collection, this will bring some errors, some unpredictable errors, So it is forbidden to do so in collection.29th, when an object is passed as a parameter to a method, this method can change the properties of the object and return the changed result, so is this a value pass or a reference pass?Reference passing, there is no doubt that object passing can only be a reference. You can change the content of the reference, but not change the reference itself.30th,

load Java extension libraries. The implementation of the Java virtual machine provides an extension library directory. The class loader finds and loads Java classes in this directory.3. Systems Class Loader (System class loader): It loads Java classes based on the Java application's Classpath (CLASSPATH). In general, Java-applied classes are loaded by it. It can be obtained by Classloader.getsystemclassloader ().4. User-defined ClassLoader, implemented by inheriting the Java.lang.ClassLoader cl

Detailed answers to MySQL permissions A Permission table 3 permission tables in the MySQL database: User, DB, host The access procedure for the permission table is: 1 first from the user table in the host, user, password these 3 fields to determine the connection of IP, user name, password exists in the table, the existence is authenticated; 2 through permission verification, when assigning rights, according to the order of User?db?tables_priv?col

c.window.location= The role of "a.html" and window.location.href= "a.html" is to replace the current page with the a.html page D. Defines the global variable G; You can access the variable in a WINDOW.G way Third, questions and answers: 1, talk about the use of JavaScript array sorting method sort (), focusing on the use of sort () parameters and its internal mechanism answer: Syntax: Arrayobject.sort (SortBy) Parameter sortby: Optional, specify sor

This article prepares 70 shell script interview questions and answers, and shell scripts are the skills that must be mastered in Linux work.1 How can I pass parameters to a script?./script argumentExample: Display file name script./show.sh File1.txtCat show.sh#!/bin/bashCat $2 How do I use parameters in a script?First argument: $, second argument: $Example: The script will copy the file (arg1) to the destination address (ARG2)./copy.sh file1.txt/tmp/C

that are notified when the user makes certain actions, such as clicking a button, on the control. Use a delegate to declare an event. A delegate object encapsulates a method so that the method can be called anonymously. An event is a method that a class allows a client to provide a delegate for which the methods should be invoked when the event occurs. When an event occurs, the delegate that its customer provides to it is invoked. 　　5. Write a console application that completes the following fu

| | | | user | 0 | PRIMARY | 2 | User | A | 4 | NULL | NULL | | BTREE | | | +-------+------------+----------+--------------+-------------+-----------+-------------+----------+----- ---+------+------------+---------+---------------+ 2 rows in set (0. XX sec) 11. What is a CSV table?A: CSV is a comma-separated value (comma-separated values) or an abbreviation that is also known as a character-delimited value (character-separated values). CSV tables store data in plain text and t

student's school number, name and average score;Select Student.sid,student.sname,b.numname from (select Student_id,avg (num) as Numname from score GROUP by student_id HAVI NG AVG (num) >60) as Bleft JOIN student on B.student_id=student.sid4, inquiry all students of the school number, name, number of courses selected, total;SELECT Student_id,student.sname,count (course_id), SUM (num) from score left JOIN student on Score.student_id=student.sid GROUP by student_id5, inquire the surname "Li" the n

/wKiom1d5Hi3x6tPhAAAbsLi6soc522.png " >Eight, null value (a) null is a strange valueNull is not equal to null value650) this.width=650; "border=" 0 "src=" http://s3.51cto.com/wyfs02/M02/83/A3/wKiom1d5Hi2jI0b3AAAFN1lTjlg919.png " >650) this.width=650; "border=" 0 "src=" http://s3.51cto.com/wyfs02/M02/83/A2/wKioL1d5Hi7yQC_XAAAGgzeoJhU566.png ">Null is not equal to NULL650) this.width=650; "border=" 0 "src=" http://s3.51cto.com/wyfs02/M00/83/A2/wKioL1d5Hi6iCClMAAAHqnN5Hbs303.png " >650) this.width=

amount of the month, Debitoccur: The amount of the occurrence.Database name: Jcyaudit, Data set: Select * from TestDBAnswer: Select A.*From TestDB A, (select Occmonth,max (debitoccur) debit101ccur from TestDB where accid= ' 101 ' GROUP by Occmonth) bwhere A.occmonth=b.occmonth and A.debitoccur>b.debit101ccur************************************************************************************Interview question: How to put such a tableYear Month amount1991 1 1.11991 2 1.21991 3 1.31991 4 1.41992 1

NULL5 8 NULLNULL NULL 9------------------------------------------1)Select a. department name Dname,b. Performance YJ as ' January ', c. Performance YJ as ' February ', d. performance YJ as ' March 'From table1 a,table2 b,table2 c,table2 DWhere a. DEP Department = B. DEP department and b. Month Mon = ' January ' andA. Department dep = c. DEP department and c. Month Mon = ' February ' andA. Department dep = D. Department DEP and d. Month Mon = ' March ' and2)Select A.DEP,SUM (case if B.mon=1 then

' (4) Find Projects J2 The names and quantities of the various parts used. SELECT Pname,qty from Spj,p WHERE P.PNO=SPJ. PNO and SPJ. jno= ' J2 ' (5) Find all the part numbers supplied by the Shanghai manufacturer. SELECT PNO from Spj,s WHERE S.SNO=SPJ. SNO and city= ' Shanghai ' (6) The project name of the part that uses the seafood. SELECT Jname from Spj,s,j WHERE S.SNO=SPJ. SNO and s.city= ' Shanghai ' and J.JNO=SPJ. Jno (7) Find out the engineering number of the parts not used in Tianjin.

operation:Back Time-Front timeDate subtraction The default result is the difference in daysMonths_between (Back Time-front time)Months_between default return result is the number of months differenceB. Value of date takenExtract functionExtract (year from Sysdate)3. Paging QueryRownum:oracle-specific keywords for pagingA. Nested implementation paging QueryPaged queries are nested with two queries, internal queries are used to specify upper bounds, and result sets return rownum, and external que

Tags: research and Development Select Table Practice ISA Relationship Comm varchar ExercisesOne, the existing three database tables, respectively, the Department table, Staff table, Department and Employee Relations table 1. Department tableCREATE TABLE ' t_dept ' (' ID ' int (8) not NULL auto_increment,' Dept_name ' varchar (the DEFAULT NULL COMMENT ' Department '),PRIMARY KEY (' id ')) CHARACTER SET UTF8 COLLATE utf8_general_ci comment= ' departmental table ID is the primary key '; 2. Employee

is very likely that there will be multiple lines of text in the actual edits at this point we use the command to display the line number so that we can better edit the text.Specific description of the general mode of deletion, copy and paste?A: Previously deleted one character and deleted one character backwards: x,xDelete cursor Line: DDDelete cursor down n rows: nddCopy cursor line: yyCopy cursor down n line: NyyPaste from the next row and previous line on the lines: P and PHow do I enter edi