The latest 1+x certificate for 2019 Web front-end development intermediate theory examination (including PDF HD version)

1+x Certificate Web Front-end Development Intermediate Theory Examination (Exam Paper 9)

Official QQ Group

1. A total of 30 questions, 60 points

existJavaScriptThe correct description of the following options about this is ()
 A When using new to instantiate an object, this points to this instance object
 B When the object is calledfunctionOr when a method, this points to this object.
 In strict mode, this points to window
 D In any case this pointing cannot be modified once it is determined

The difference between mysql_connect() and @mysql_connect() is:
 A@mysql_connect() will not ignore the error and display the error to the client
 Bmysql_connect() will not ignore the error and display the error to the client
 C No difference
 D Two functions with different functions

Which of the following classes are used for containers that are fixed-width and support responsive layouts?
 Acontainer
 Bcenter
 Ccontainers
 DcontainerFluid

Use the () attribute in CSS to implement text surround images.
 Amargin
 Bfloat
 Cpadding
 Dsrc

Which type is a slider control in a form form?
 Asearch
 Bcontrols
 Cslider
 Drange

existMySQLIn, the keyword used by joint query is ()
 AJOIN
 BUNION
 CALL
 DFULL

existLaravelIn the framework, use the () keyword for different parts of the template file?
 A@class
 B@yield
 C@extends
 D@section

Is the correct writing format for inserting comments in a CSS file ()?
 A//this is a comment
 B#this is a comment//
 C/this is a comment/
 D’this is a comment

In PHP operators, the priority from high to low is ( )
 A relational operator, logical operator, arithmetic operator
 B arithmetic operations, relational operators, logical operators
 C logical operators, arithmetic operators, relational operators
 D relational operators, arithmetic operators, logical operators

In MySQL, the wrong statement about index management is ()
 A You can create an index when executing a CREATE TABLE statement, or you can use CREATE INDEX or AL TER TABLE to add an index to the table
 B It is possible to set that certain field columns in the data table cannot contain duplicate values ​​through a unique index
 Both CALTER TABLE or DROP INDEX statements can delete indexes in data tables
 D The command to view the index is: SHOW INDEX Data table name

In cache, the maximum limit that a cookie can store is ( )
 A1kb
 B2kb
 C3kb
 D4kb

The following tags do not belong to the list tag ()
 Aul
 Bdl
 Col
 Dp

The following execution result in javascript is incorrect ()
 (3, 4, 5) Return 5
 (-9) Return 9
 (3.5) Return 3
 (4.2) Return 4

In the Laravel framework, when a form submits a request, the following statement is correct ()
 A requests with get, and token verification is required;
 B Use post to request, and token verification is required. Add {{ csrf_field() }} or @csrf to the form;
 C requests with get and post, do not require token verification;
 D The above statements are not correct;

In bootstrap4, the error in the split screen type of responsive raster system is ().
 -sm-
 -md-
 -sx-
 -lg-。

In MySQL, if you find out the information of all the boys in the class teacher "Wang Xiaoxiao" class, the correct SQL statement is ()
 Aselect * from student where gender ='male' and class number == (select class number fr om class where class teacher ='Wang Xiaoxiao')
 BSelect * from student where gender ='male' and class number in (select class number fro m class where class teacher ='Wang Xiaoxiao')
 CSelect * from student where gender ='male' and class number union (select class number from class where class teacher ='Wang Xiaoxiao')
 DSelect * from student where gender ='male' and class number as (select class number fr om class where class teacher ='Wang Xiaoxiao')

In php, the result of $result in the following code is () $x=""; $result=is_null($x); var_dump($result);
 A Report an error
 Bbool(true)
 Cbool(false)
 D""

In processing the response, if we want to process it in text, what attributes do we need to place the XMLHttpRequest object in the parameter table?





In javascript, declare an object, add the name attribute and show method to display its name value. The correct one in the following code is ()
 Avar obj = [name:"zhangsan",show:function(){alert(name);}];
 Bvar obj = {name:"zhangsan",show:”alert()”};
 Cvar obj = {name:"zhangsan",show:function(){alert(name);}};
 Dvar obj = {name:"zhangsan",show:function(){alert();}};

In php, the number of executions of statements for(k=0;k=1;k++); and statements for(k=0;k==1;k++); are respectively:
 A Infinite and 0
 B0 and Infinite
 C is infinite
 D is 0

Regarding mysql_fetch_object statement, the correct one is: ( )
 Amysql_fetch_object is the same as mysql_fetch_array, no difference
 Bmysql_fetch_object The return value is an object, so it is slower than mysql_fetch_array in terms of speed
 Cmysql_fetch_object The return value isArray, so in terms of speed, it is almost the same as mysql_fetch_array and m ysql_fetch_row
 Dmysql_fetch_object The return value is an object, which is similar to mysql_fetch_array and mysql _fetch_row in terms of speed

Which of the following is a new attribute added to CSS3 ()
 Abox-shadow
 Bborder
 Cbackground
 Ddisplay

Is the bootstrap plugin developed based on()?
 Ajavascript
 Bjquery
 Cangular js
 Dnode js

What is not part of the implementation principle of a grid system is ()
 A Customize the size of the container. Average divided into 12 copies
 B Developed based on JavaScriptComponents
 C combined with media query

The wrong statement about the usage of "+" in javascript is ()
 A can be used for addition operations
 B Cannot convert data types
 C can link strings
 D can be a symbol for executing the function immediately

The readyState status of the XMLHttpRequest object, when ==1 indicates: ()
 A Request received
 B The server link has been established
 C Request completed
 D Not initialized

In laravel, the interface file should be placed under which path ()
 Aapp\http\controllers
 Bpublic/html
 Cresources\views
 Droutes

In MySQL, the correct SQL statement to create a database test is ()
 ACREATE DATABASE IF EXISTS test
 BCREATE IF NOT EXISTS test
 CCREATE DATABASE IF NOT EXISTS test
 DCREATE IF NOT EXISTS test DATABASE

In the MySQL database server, you can view all available databases in the current system and execute the ( ) instruction.
 ASHOW DATABASES;
 BSHOW TABLES;
 CDESCRIBE DATABASES;
 DDISPLAY LIBRARIES;

In jQuery, the following statement is wrong ( )
 A$("ul li:first") refers to selection

• The first one below
• Sub-elements
   B$("ul li:gt(2)") refers to selection
  • The index under the following starts with 2
  • Sub-elements
     C$("ul li:eq(2)") refers to selection
    • The index below is 2
    • Sub-elements
       D$("ul li:not(:first)") refers to selection
      • Except for the first one
      • All child elements
      • Sub-elements

        2. A total of 15 questions, 30 points

        In MySQL, create a shopping table, where one of the fields records the shopping time (requires accurate to seconds), then the appropriate data type for this field is ().
         ADATE
         BTIME
         CDATETIME
         DTIMESTAMP

        In Bootstrap4, the following statement is correct
         A<576px pixels are ultra-small screens, using .col-*
         B≥576px pixels are small screens, use .col-sm-*
         C≥768px pixels are medium screens, use .col-md-*
         D≥992px pixels are large screens, use .col-lg-*
         E≥1200px pixels are super large screens, using .col-xl-*

        The following tags belong to HTML5 structure tags ()
         Aheader
         Bfooter
         Cnav
         Dhgroup
         Ep

        Using Ajax can bring convenience ()
         A Reduce the burden on the server
         B No refresh update page
         C can call external data
         D Can not use Javascript scripts

        What key names can be used for arrays in php?
         A Number key name
         B Subscript
         Cnull
         D Text (or string) key name

        In MySQL, the correct statement about database recovery is ( )
         A SQL statements in the backup SQL file can achieve the purpose of database recovery
         The BSOURCE command to restore the database is: SOURCE /path/db_name.sql
         C The syntax for using the mysql command to restore a database is: mysql ?u username ?p [dbname] < /path/db_name.sql
         The DSOURCE command recovery database can be executed in the DOS command window as well as the mysql command.

        The technologies that make up Ajax include ()
         ADOM
         BXML
         CJS
         DHTML

        The following statement is correct ()
         All tags representing titles in AHTML should be used with h1
         B should use h1 as the main title (most important), followed by h2 (second important), followed by h3 and so on.
         C You should decide to use the appropriate title tag based on the hierarchical relationship of the content in the page.
         The Dh1 tag is used to describe the top-level title in a web page.

        In MySQL, the following statement about data types is correct ()
         Avarchar type and char type are both string types, there is no difference
         Field of type Bvarchar(4), if "abcdef" is inserted, an error with excessive length will be reported.
         The length of the Cvarchar type is fixed, and the length of the char type is variable
         Field of type Dchar(2) when inserting "abc", the number of characters occupied is 2, and inserting "ab" in the database

        In laravel, the correct statement about page jump is
         Return redirect('home/test'); method of using redirect to jump in the controller;
         Bfront page, this method is for command routing;
         Cfront page, this method can be used without a named route;
         Dfront page

        The correct statement about RESTful API is ()
         A It is a standard, stateless request
         B The requested routing address is fixed
         C usage standards include .post .put .delete
         D All the above statements are correct

        PHP allows comment symbols:
         A//
         B Closed paragraph
         C#
         D/and/ Closed paragraph

        What is the correct statement about the difference between session and cookies?
         Asession and cookies can record data status.
         B There is no output until session and cookie are set.
         C Before using cookies, use the cookie_start() function to start.
         D Before using session, use the session_start() function to start.

        About HTML tags that are correct ()
         Adiv tags are mainly used for layout
         The code indentation in the tag in Bhtml is for easy reading
         C

        web frontend

        
         D
        Cannot nest ul,h tags

        What are the types of transforms ()
         Ascale
         Bskew
         Ctranslate
         Drotate
         Etansition

        3. Judgment questions total 5 questions, 10 points

        Same-origin policy refers to the domain name, protocol, and port.
         A Yes
         B Wrong

        The principle of ajax is "get data on demand", which can minimize the burden on the server caused by redundant requests and responses.
         A Yes
         B Wrong

        In MySQL, using indexes cannot avoid scanning of full tables
         A Yes
         B Wrong

        "use 'demoDB'" in mysql switch to demoDb database

         A Yes
         B Wrong

        You can use echo output data types in PHP programs
         A Yes
         B Wrong

        1+x certificate web front-end development junior corresponding course analysis
        http://blog.//archives/194/