Common interview questions for bootstrap (summary)

This article summarizes some common bootstrap interview questions for you. It has certain reference value. Friends in need can refer to it. I hope it will be helpful to you. If you want to learn and get more bootstrap related tutorials, you can also visit: bootstrap tutorial!

1. Why use bootstrap?

Bootstrap has the advantages of mobile device priority, good browser support, easy to use, responsive design, etc. So Bootstrap is widely used.

2.Add the viewport meta tag in the head

In order to make the website developed by Bootstrap mobile-friendly and ensure proper drawing and touch screen scaling, it is necessary Add the viewport meta tag to the head of the web page, and the

width attribute controls the width of the device. Assuming that your website will be viewed on devices with different screen resolutions, setting it to device-width will ensure that it renders correctly on different devices.

iinitial-scale=1.0;Ensure that when the web page is loaded, it will be rendered at a 1:1 ratio without any scaling.

On mobile browsers, the zooming functionality can be disabled by adding user-scalable=no to the viewport meta tag.

Normally, maximum-scale=1.0 is used with user-scalable=no. After disabling the zoom function, users can only scroll the screen, which can make your website look more like a native application, so add the following code:

<metaname="viewport" content="width=device-width,initial-scale=1">

3. For various sizes For devices, what are the class prefixes set by Bootstrap?

Extra small device phones (<768px): .col-xs-

Small device tablets (>=768px): .col-sm-

Medium Device Desktop (>=992px): .col-md-

Large Device Desktop (>=1200px): .col-lg-

4 .How to set up a responsive table in Bootstrap?

Add class="table-responsive"

5. What are the basic steps to create a vertical form using Bootstrap?

(1) Add role="form" to the parent

element;

(2) Place the label and control in a group with class="form-group " in

, which is necessary to obtain optimal spacing;

(3) Add class=" to all text elements , , <select> form-control". </p> <p><strong>6. What are the basic steps to create a horizontal form using Bootstrap? </strong></p> <p>(1) Add class="form-horizontal" to the parent <form> element; </p> <p>(2) Place the label and control in a file with class="form -group"<p>; </p> <p> (3) Add class="control-label" to the label. </p> <p><strong>7. How to create help text for form controls using Bootstrap? </strong></p> <p>Add span tag or p tag with class="help-block". </p> <p><strong>8. How to activate or disable buttons using Bootstrap? </strong></p> <p>Activate button: add .active class to button</p> <p>Disable button: add disabled="disabled" attribute to button</p> <p><strong>9, Bootstrap What classes are there for <img>? </strong></p> <p>(1).img-rounded Add rounded corners to the picture</p> <p>(2).img-circle Turn the picture into a circle</p> <p>(3). img-thumbnail thumbnail function</p> <p>(4).img-responsive image responsiveness (will be well extended to parent elements)</p> <p><strong>10. Floating and clearing of related elements in Bootstrap Floating class? </strong></p> <p> (1) class="pull-left" elements float to the left </p> <p> (2) class="pull-right" elements float to the right </p> <p> ( 3) class="clearfix" clear floating </p> <p><strong>11. In addition to screen readers, what is the class of hidden elements on other devices? </strong></p> <p>class="sr-only"</p> <p><strong>12. How to create a drop-down menu in Bootstrap? </strong></p> <p>(1) Wrap the drop-down menu in <p> of class="dropdown"; </p> <p>(2) Add: class=" to the button that triggers the drop-down menu btn dropdown-toggle" id="dropdownMenu1" data-toggle="dropdown"</p> <p> (3) Add in the ul that wraps the drop-down menu: class="dropdown-menu" role="menu" aria-labelledby ="dropdownMenu1"</p> <p>(4) Add: role="presentation" to the list item of the drop-down menu. Among them, class="dropdown-header" should be added to the title of the drop-down menu, and tabindex="-1" should be added to the options part. </p> <p><strong>13. How to create a button group in Bootstrap? And the priority of horizontal button group and vertical button group? </strong></p> <p> (1) Use class="btn-group" <p> to wrap the button group; class="btn-group-vertical" can set a vertical button group. </p> <p>(2) The priority of btn-group is higher than the priority of btn-group-vertical. </p> <p><strong>14. How to set the drop-down menu of the button in Bootstrap? </strong></p> <p> Just place buttons and drop-down menus in a .btn-group. </p> <p><strong>15. How to make the input box group in Bootstrap? </strong></p> <p> (1) Place the prefix or suffix element in a <p> with class="input-group"; </p> <p> (2) In the < p>, place additional content inside the <span> of class="input-group-addon"; </p> <p>(3) Place <span> before or after the <input> element . </p> <p><strong>16. What are the navigations in Bootstrap? </strong></p> <p> (1) Navigation elements: There are tab navigation with class="nav nav-tabs" and capsule tab navigation with class="nav nav-pills"; </p> <p> (2) Navigation bar: class="navbar navbar-default" role="navigation"; </p> <p> (3) Breadcrumb navigation: class="breadcrumb"</p> <p>##17 , Set the paging class in Bootstrap? <strong></strong></p>Default paging: class="pagination"<p></p>Default paging: class="pager"<p></p> <p>18. Display labels in Bootstrap class? <strong></strong></p>class="label"<p></p> <p>19. How to create a badge in Bootstrap? <strong></strong></p><span class="badge">26</span><p></p> <p>20. What is the role of the super large screen in Bootstrap? <strong></strong></p>Setting class="jumbotron" can make a jumbo screen. This component can increase the size of the title and add more margins. <p></p>Summary: The above is the entire content of this article, I hope it will be helpful to everyone's study. <p></p><p>The above is the detailed content of Common interview questions for bootstrap (summary). 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