However, it is not recommended to enable all register_globals variables because it brings security risks to the program.
<A href = "#">Create a. CSS style FileIn the file, use the id or class separator to define the style, and then on the displayed HTNL HomepageUse the <link> label to introduce a file. For example:
<Link type = "text/css" rel = "stylesheet" href = "path">
3. common attributes of CSS styles:
Common attributes of CSS styles
Attribute name |
Analysis |
Border |
You can define border attributes to set Border width, color, and style. |
Background-color |
Set background color |
Background-image |
Set background image |
Font-size |
Set Font Size |
Font-family |
Set Font |
Text-decoration |
Retrieves or sets the decoration of text in an object, such as underline and blinking. |
Line-height |
Retrieves or sets the Row Height of an object, that is, the distance between the bottom of the font and the top of the font. |
Letter-spacing |
Retrieves or sets the interval between texts in an object. |
Text-align |
Sets or retrieves the text alignment of an object. |
4. How to Solve the double margin problem of the following code under IE6?
<style type="text/css">body {margin:0;}div {float:left; margin-left:10px; width:200px; height:200px; border:1px; solid red;}</style>
This is a common Bug in IE6. Although the defined margin is 10px, IE is parsed to 20px.
Solution:Add property display: inline
5. How can I solve the problem that the hover style does not appear after the hyperlink is clicked?
Sort the hyperlink style attributes correctly.
A: link {color: red; text-docoration: none}
A: visited {color: blue; text-decoration: none}
A: hover {color: black; text-decoration: overline}
A: action {color: black; text-decoration: overline}
6. How can I solve the problem that text in Firefox cannot open containers?
Add two CSS attributes,Min-widthAndMin-heightYou can also add a class clear: both attribute div to clear alignment to automatically calculate the height of Firefox.
7. How to define a container with a height of around 1 px?
In the process of webpage layout, a partition is usually required between the navigation bar and the content bar. Generally, the height of one pixel is the best.
DIV tag
1. The difference between the tag <span> and <div>:
The <div> and <span> tags also apply to the webpage layout. Their differences are as follows:
- The span tag is inline and is generally used for inline styles of small modules into HTML documents.
- The div element itself is a block-level element. It is mostly used to combine large pieces of code.
2. How to center a DIV layer?
Position: absolute;
Top: 50%;
Left: 50%;
Margin:-100px 0 0-100px;
3. How to solve the problem that the text-align attribute of the nested div label in the filefox browser is invalid?
1 <style>2 .one {border:1px solid blue;width:300px;height:200px;text-align:center }3 .two {border:1 px solid blue;width:200px;height:100px;margin:0px auto }4 </style>5 <div class="one">6 <div class="two"></div>7 </div>
JavaScript script
1. Functions in the pop-up dialog box and input focus functions:
Dialog BoxAlert ()Function
Get input focus usageFocus ()Function
2. What are the conversion functions of JavaScript? How to introduce an external JavaScript file?
Steering function:Window. location. href = "file name ";
Introduce external JavaScript files:<Script type = "text/javascript src = 'file path and name'"> </script>
3. When you hover the mouse over the text box, the content in the text box is automatically selected:
<Input id = "txt" type = "text" value = "baidu" onmouseover = "this. select ()"/>
4
<Input id = "txt" type = "text" value = "baidu" onclick = "this. value ='' "/>
5. Set the JavaScript code for the Home Page:
<A href = "#" onclick = "this. style. behavior = 'url (# default # homepage) '; this. setHomepage ('url'); "> set as homepage </a>
Ajax applications
1. Use Ajax in jQuery to determine whether the user name is occupied:
You need to define two pages. The index. php Page code is as follows:
1 <script type = "text/javascript" src = "jquery-1.4.2.js"> </script> 2 <input type = "text"> <input type = "button" value = "Check "> 3 <script type =" text/javascript "> 4 $ (function () {5 $ ("input: last ". click (function () {6 $. get ("in. php ", {7 username: $ (" input: first "). val () 8}, function (data) {9 alert (data); 10}) '11}); 12}); 13 </script>
The in. php Page code is as follows:
1 <? Php 2 $ string = ""; 3 if (isset ($ GET [username]) {4 if (urldecode ($ GET [username]) = $ string) {5 echo "username occupied"; 6} else {7 echo "username available"; 8} 9} 10?>
2. Write the code so that you can enter a year in the text box, judge the Zodiac, and output it next to the text box. You need to write HTML and JavaScript code:
The front-end page design code is as follows:
1 PHP script for judging the Zodiac in the background:1 <? Php2 if (isset ($ _ GET [number]) {3 $ array = array ("pig", "rat", "Ox", "Tiger", "rabbit ", "Dragon", "snake", "horse", "goat", "monkey", "chicken", "dog "); 4 foreach ($ array as $ key =>$ value) {5 if (ceil ($ _ GET [number] % 12) =key key) {6 echo $ value; 7} 8} 9}
JQuery framework
Currently, jQuery is a popular Client Scripting framework created by John Resig, an excellent JavaScript framework. Its purpose is to write less and do more. it is a lightweight js library, compatible with CSS3, and compatible with various browsers (IE 6.0 + ). Users can easily process HTML document and events, achieve animation effects, and provide AJAX interaction for websites. Another major advantage of jQuery is its comprehensive documentation and detailed descriptions of various applications. There are also many mature plug-ins to choose from. JQuery can ensure the separation of code and HTML content for your HTML pages. That is to say, you don't need to insert a bunch of JavaScript code into the HTML to call the command. You just need to define the id.
1. Commonly Used selectors in jQuery:
Basic selector:
Id selector: can be used only once
Class selector: Allows repeated use
Tag Selector
*: Matches all elements.
Level selector:
$ ("# A. B") select all elements whose class value is B in the element whose id value is.
$ ("# A>. B") Select the child element whose class value is B after the element whose id value is.
$ ("# A +. B") Select an element whose id is a and the next class value is B.
Filter selector:
: First, select the first element.
: Odd. Select an element with an odd index.
: Even. Select the element whose index is an even number.
: Not. Select other elements except an element.
: Eq (), search for elements by index.
: Lt (), an element smaller than a certain index value.
: Gt, an element greater than an index value.
2. How to Find the elements in the DOM tree?
Var input = $ ("input: first ");
3. How to create and insert elements in the DOM tree?
1 <script type = "text/javascript" src = "jquery-1.4.2.js"> </script> 2 <div> fruit </div> 3 <script> 4 var title = $ (" <span> Apple </span> "); 5 $ ("div "). append (title); // append the title to the next 6 $ ("div") of the div TAG content "). before (title); // before appending the title to the div tag, it belongs to the same level as the div tag. 7 $ ("div "). prepend (title); // Add the title to the content before the div tag 8 $ ("div "). after (title); // append the title to the div tag and the div tag belongs to the same level 9 </script>
4. How to replace the specified Element in the DOM tree?
1 <script type = "text/javascript" src = "jquery-1.4.2.js" </script> 2 <div> fruit </div> 3 <script> 4 var title = $ ("< span> Apple </span> "); 5 $ ("div "). replaceWith (title); 6 </script>
5. disappear the fade-out effect of an image on the page:
1 <script type="text/javascript" src="jquery-1.4.2.js"></script>2 3 <script>4 $("img".click(function(){5 $(this).fadeOut("slow");6 });7 </script>
6. Create a button. When the button is clicked, the shutter effect disappears:
1 <script type = "text/javascript" src = "jquery-1.4.2.js"> </script> 2 <input type = "button" value = "button"> 3 $ ("input" ). click (d = function () {4 $ (this ). slideUp ("slow"); 5}); 6 </script>
7. Photo rotation effect:
1 <script type="text/javascript" src="jquery-1.4.2.js"></script> 2 <style> 3 ul{list-style:none;width:350px;height:200px;position:absolute} 4 li{position:ansolute} 5 </style> 6 <div class="change"> 7 <ul> 8 <li></li> 9 <li></li>10 <li></li>11 <li></li>12 </ul>13 </div>14 <script>15 $(function(){16 $(."change ul li:not(:first)").hide();17 setInterval(function(){18 if($."change ul li:last").is(":visible")){19 $(."change ul li:first").fadeIn("slow");20 $(."change ul li:last").hide();21 }else{22 $(."change ul li:visible").next().fadeIn("slow");23 }24 },1000);25 });26 </script>
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