Application of Sprite Pictures

On the weekend, I studied the implementation of sprite graphics. Let’s first learn about sprite pictures. Sprite pictures mean css sprites, and they are also called css sprites. That is, merge the small icon and background image into one image, and then use the background positioning of CSS to display the part of the image that needs to be displayed.

1. Benefits and advantages:

Effectively reduce the number of http requests on the website and speed up the display of images.

2. Conditions:

• Static pictures, pictures do not change according to changes in user information.
• Small pictures with relatively small capacity (2~3k).
• The image loading capacity is relatively large.

Note: It is not recommended to use Sprite images for large pictures. If the picture is so big, it will be invincible after disassembly, and the loading will be slow, which is not worth the loss! ! !

3. Principle : Use css3's background-position to control a layer Display the size of the area and slide the background image through a window .

To put it simply, use this attribute to set the starting position where the background image needs to be displayed, and control the display range of the background image through labels .

4. Let’s first understand the background-position attribute,

Based on the picture:

• Take the upper left corner as (0,0) coordinates
• x and y are both negative values

In summary, the value of background-position is the starting coordinate of the background image display, in the form of background-position: 0, 0;

5. Jigsaw puzzle: You can use PS or many online sprite image generation tools on the Internet to generate sprite images.

I used an online puzzle tool to manually drag and drop the comments, which is a bit disgusting~~haha

In fact, the best puzzle is to control the margins of each icon and the amount of white space around the icon. If the coordinates of the background-position of the css are written regularly, it will be much better (however, this I dragged it manually, and the position is very irregular, so the coordinate values ​​below are all taken after debugging)

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After talking about this, we can get to the main topic, html and css code. The following code is to imitate a menu~~~

6. Code:

<span style="color: #008080;"> 1</span>    <span style="color: #0000ff;"><</span><span style="color: #800000;">div </span><span style="color: #ff0000;">id</span><span style="color: #0000ff;">="content"</span><span style="color: #0000ff;">></span>
<span style="color: #008080;"> 2</span>         <span style="color: #0000ff;"><</span><span style="color: #800000;">ul </span><span style="color: #ff0000;">class</span><span style="color: #0000ff;">="content"</span><span style="color: #0000ff;">></span>
<span style="color: #008080;"> 3</span>             <span style="color: #0000ff;"><</span><span style="color: #800000;">li </span><span style="color: #ff0000;">class</span><span style="color: #0000ff;">="cat-1"</span><span style="color: #0000ff;">></span>
<span style="color: #008080;"> 4</span>               <span style="color: #0000ff;"><</span><span style="color: #800000;">i</span><span style="color: #0000ff;">></</span><span style="color: #800000;">i</span><span style="color: #0000ff;">></span>
<span style="color: #008080;"> 5</span>               <span style="color: #0000ff;"><</span><span style="color: #800000;">h3</span><span style="color: #0000ff;">></span>女装/男装/内衣<span style="color: #0000ff;"></</span><span style="color: #800000;">h3</span><span style="color: #0000ff;">></span>
<span style="color: #008080;"> 6</span>             <span style="color: #0000ff;"></</span><span style="color: #800000;">li</span><span style="color: #0000ff;">></span>
<span style="color: #008080;"> 7</span>             <span style="color: #0000ff;"><</span><span style="color: #800000;">li </span><span style="color: #ff0000;">class</span><span style="color: #0000ff;">="cat-2"</span><span style="color: #0000ff;">></span>
<span style="color: #008080;"> 8</span>               <span style="color: #0000ff;"><</span><span style="color: #800000;">i</span><span style="color: #0000ff;">></</span><span style="color: #800000;">i</span><span style="color: #0000ff;">></span>
<span style="color: #008080;"> 9</span>               <span style="color: #0000ff;"><</span><span style="color: #800000;">h3</span><span style="color: #0000ff;">></span>鞋靴/箱包/配件<span style="color: #0000ff;"></</span><span style="color: #800000;">h3</span><span style="color: #0000ff;">></span>
<span style="color: #008080;">10</span>             <span style="color: #0000ff;"></</span><span style="color: #800000;">li</span><span style="color: #0000ff;">></span>
<span style="color: #008080;">11</span>             <span style="color: #0000ff;"><</span><span style="color: #800000;">li </span><span style="color: #ff0000;">class</span><span style="color: #0000ff;">="cat-3"</span><span style="color: #0000ff;">></span>
<span style="color: #008080;">12</span>               <span style="color: #0000ff;"><</span><span style="color: #800000;">i</span><span style="color: #0000ff;">></</span><span style="color: #800000;">i</span><span style="color: #0000ff;">></span>
<span style="color: #008080;">13</span>               <span style="color: #0000ff;"><</span><span style="color: #800000;">h3</span><span style="color: #0000ff;">></span>童装玩具/孕产/用品<span style="color: #0000ff;"></</span><span style="color: #800000;">h3</span><span style="color: #0000ff;">></span>
<span style="color: #008080;">14</span>             <span style="color: #0000ff;"></</span><span style="color: #800000;">li</span><span style="color: #0000ff;">></span>
<span style="color: #008080;">15</span>             <span style="color: #0000ff;"><</span><span style="color: #800000;">li </span><span style="color: #ff0000;">class</span><span style="color: #0000ff;">="cat-4"</span><span style="color: #0000ff;">></span>
<span style="color: #008080;">16</span>               <span style="color: #0000ff;"><</span><span style="color: #800000;">i</span><span style="color: #0000ff;">></</span><span style="color: #800000;">i</span><span style="color: #0000ff;">></span>
<span style="color: #008080;">17</span>               <span style="color: #0000ff;"><</span><span style="color: #800000;">h3</span><span style="color: #0000ff;">></span>家电/数码/手机<span style="color: #0000ff;"></</span><span style="color: #800000;">h3</span><span style="color: #0000ff;">></span>
<span style="color: #008080;">18</span>             <span style="color: #0000ff;"></</span><span style="color: #800000;">li</span><span style="color: #0000ff;">></span>
<span style="color: #008080;">19</span>             <span style="color: #0000ff;"><</span><span style="color: #800000;">li </span><span style="color: #ff0000;">class</span><span style="color: #0000ff;">="cat-5"</span><span style="color: #0000ff;">></span>
<span style="color: #008080;">20</span>               <span style="color: #0000ff;"><</span><span style="color: #800000;">i</span><span style="color: #0000ff;">></</span><span style="color: #800000;">i</span><span style="color: #0000ff;">></span>
<span style="color: #008080;">21</span>               <span style="color: #0000ff;"><</span><span style="color: #800000;">h3</span><span style="color: #0000ff;">></span>美妆/洗护/保健品<span style="color: #0000ff;"></</span><span style="color: #800000;">h3</span><span style="color: #0000ff;">></span>
<span style="color: #008080;">22</span>             <span style="color: #0000ff;"></</span><span style="color: #800000;">li</span><span style="color: #0000ff;">></span>
<span style="color: #008080;">23</span>             <span style="color: #0000ff;"><</span><span style="color: #800000;">li </span><span style="color: #ff0000;">class</span><span style="color: #0000ff;">="cat-6"</span><span style="color: #0000ff;">></span>
<span style="color: #008080;">24</span>               <span style="color: #0000ff;"><</span><span style="color: #800000;">i</span><span style="color: #0000ff;">></</span><span style="color: #800000;">i</span><span style="color: #0000ff;">></span>
<span style="color: #008080;">25</span>               <span style="color: #0000ff;"><</span><span style="color: #800000;">h3</span><span style="color: #0000ff;">></span>珠宝/眼镜/手表<span style="color: #0000ff;"></</span><span style="color: #800000;">h3</span><span style="color: #0000ff;">></span>
<span style="color: #008080;">26</span>             <span style="color: #0000ff;"></</span><span style="color: #800000;">li</span><span style="color: #0000ff;">></span>
<span style="color: #008080;">27</span>             <span style="color: #0000ff;"><</span><span style="color: #800000;">li </span><span style="color: #ff0000;">class</span><span style="color: #0000ff;">="cat-7"</span><span style="color: #0000ff;">></span>
<span style="color: #008080;">28</span>               <span style="color: #0000ff;"><</span><span style="color: #800000;">i</span><span style="color: #0000ff;">></</span><span style="color: #800000;">i</span><span style="color: #0000ff;">></span>
<span style="color: #008080;">29</span>               <span style="color: #0000ff;"><</span><span style="color: #800000;">h3</span><span style="color: #0000ff;">></span>运动/户外/乐器<span style="color: #0000ff;"></</span><span style="color: #800000;">h3</span><span style="color: #0000ff;">></span>
<span style="color: #008080;">30</span>             <span style="color: #0000ff;"></</span><span style="color: #800000;">li</span><span style="color: #0000ff;">></span>
<span style="color: #008080;">31</span>             <span style="color: #0000ff;"><</span><span style="color: #800000;">li </span><span style="color: #ff0000;">class</span><span style="color: #0000ff;">="cat-8"</span><span style="color: #0000ff;">></span>
<span style="color: #008080;">32</span>               <span style="color: #0000ff;"><</span><span style="color: #800000;">i</span><span style="color: #0000ff;">></</span><span style="color: #800000;">i</span><span style="color: #0000ff;">></span>
<span style="color: #008080;">33</span>               <span style="color: #0000ff;"><</span><span style="color: #800000;">h3</span><span style="color: #0000ff;">></span>游戏/动漫/影视<span style="color: #0000ff;"></</span><span style="color: #800000;">h3</span><span style="color: #0000ff;">></span>
<span style="color: #008080;">34</span>             <span style="color: #0000ff;"></</span><span style="color: #800000;">li</span><span style="color: #0000ff;">></span>
<span style="color: #008080;">35</span>             <span style="color: #0000ff;"><</span><span style="color: #800000;">li </span><span style="color: #ff0000;">class</span><span style="color: #0000ff;">="cat-9"</span><span style="color: #0000ff;">></span>
<span style="color: #008080;">36</span>               <span style="color: #0000ff;"><</span><span style="color: #800000;">i</span><span style="color: #0000ff;">></</span><span style="color: #800000;">i</span><span style="color: #0000ff;">></span>
<span style="color: #008080;">37</span>               <span style="color: #0000ff;"><</span><span style="color: #800000;">h3</span><span style="color: #0000ff;">></span>美食/生鲜/零食<span style="color: #0000ff;"></</span><span style="color: #800000;">h3</span><span style="color: #0000ff;">></span>
<span style="color: #008080;">38</span>             <span style="color: #0000ff;"></</span><span style="color: #800000;">li</span><span style="color: #0000ff;">></span>
<span style="color: #008080;">39</span>             <span style="color: #0000ff;"><</span><span style="color: #800000;">li </span><span style="color: #ff0000;">class</span><span style="color: #0000ff;">="cat-10"</span><span style="color: #0000ff;">></span>
<span style="color: #008080;">40</span>               <span style="color: #0000ff;"><</span><span style="color: #800000;">i</span><span style="color: #0000ff;">></</span><span style="color: #800000;">i</span><span style="color: #0000ff;">></span>
<span style="color: #008080;">41</span>               <span style="color: #0000ff;"><</span><span style="color: #800000;">h3</span><span style="color: #0000ff;">></span>鲜花/宠物/农资<span style="color: #0000ff;"></</span><span style="color: #800000;">h3</span><span style="color: #0000ff;">></span>
<span style="color: #008080;">42</span>             <span style="color: #0000ff;"></</span><span style="color: #800000;">li</span><span style="color: #0000ff;">></span>
<span style="color: #008080;">43</span>             <span style="color: #0000ff;"><</span><span style="color: #800000;">li </span><span style="color: #ff0000;">class</span><span style="color: #0000ff;">="cat-11"</span><span style="color: #0000ff;">></span>
<span style="color: #008080;">44</span>           <span style="color: #0000ff;"><</span><span style="color: #800000;">i</span><span style="color: #0000ff;">></</span><span style="color: #800000;">i</span><span style="color: #0000ff;">></span>
<span style="color: #008080;">45</span>               <span style="color: #0000ff;"><</span><span style="color: #800000;">h3</span><span style="color: #0000ff;">></span>房产/装修/建材<span style="color: #0000ff;"></</span><span style="color: #800000;">h3</span><span style="color: #0000ff;">></span>
<span style="color: #008080;">46</span>             <span style="color: #0000ff;"></</span><span style="color: #800000;">li</span><span style="color: #0000ff;">></span>
<span style="color: #008080;">47</span>         <span style="color: #0000ff;"></</span><span style="color: #800000;">ul</span><span style="color: #0000ff;">></span>
<span style="color: #008080;">48</span>    <span style="color: #0000ff;"></</span><span style="color: #800000;">div</span><span style="color: #0000ff;">></span>

<span style="color: #008080;"> 1</span> <span style="color: #800000;">  <style type="text/css" >
</span><span style="color: #008080;"> 2</span> <span style="color: #800000;">   #content</span>{
<span style="color: #008080;"> 3</span> <span style="color: #ff0000;">       width</span>:<span style="color: #0000ff;"> 180px</span>;
<span style="color: #008080;"> 4</span> <span style="color: #ff0000;">       background</span>:<span style="color: #0000ff;"> #f8f8f8</span>;
<span style="color: #008080;"> 5</span> <span style="color: #ff0000;">       border</span>:<span style="color: #0000ff;"> 1px solid #bbb</span>;
<span style="color: #008080;"> 6</span>    }
<span style="color: #008080;"> 7</span> <span style="color: #800000;">   h3</span>{
<span style="color: #008080;"> 8</span> <span style="color: #ff0000;">       margin</span>:<span style="color: #0000ff;"> 0</span>;
<span style="color: #008080;"> 9</span> <span style="color: #ff0000;">       padding</span>:<span style="color: #0000ff;"> 0</span>;
<span style="color: #008080;">10</span>    }
<span style="color: #008080;">11</span> <span style="color: #800000;">    ul</span>{
<span style="color: #008080;">12</span> <span style="color: #ff0000;">        list-style</span>:<span style="color: #0000ff;"> none</span>;
<span style="color: #008080;">13</span> <span style="color: #ff0000;">        padding</span>:<span style="color: #0000ff;"> 0</span>;
<span style="color: #008080;">14</span>     }
<span style="color: #008080;">15</span> <span style="color: #800000;">    li h3</span>{
<span style="color: #008080;">16</span> <span style="color: #ff0000;">        font-size</span>:<span style="color: #0000ff;"> 14px</span>;
<span style="color: #008080;">17</span> <span style="color: #ff0000;">        font-weight</span>:<span style="color: #0000ff;"> 400</span>;
<span style="color: #008080;">18</span>     }
<span style="color: #008080;">19</span> <span style="color: #800000;">    li</span>{  
<span style="color: #008080;">20</span> <span style="color: #ff0000;">        margin</span>:<span style="color: #0000ff;">  3px 10px 0 0</span>;
<span style="color: #008080;">21</span> <span style="color: #ff0000;">        display</span>:<span style="color: #0000ff;"> block</span>;
<span style="color: #008080;">22</span> <span style="color: #ff0000;">        height</span>:<span style="color: #0000ff;"> 31px</span>;
<span style="color: #008080;">23</span> <span style="color: #ff0000;">        line-height</span>:<span style="color: #0000ff;"> 31px</span>;
<span style="color: #008080;">24</span> <span style="color: #ff0000;">        overflow</span>:<span style="color: #0000ff;"> hidden</span>;
<span style="color: #008080;">25</span> <span style="color: #ff0000;">        border-bottom</span>:<span style="color: #0000ff;"> 1px solid #dedede</span>;
<span style="color: #008080;">26</span> 
<span style="color: #008080;">27</span>     }
<span style="color: #008080;">28</span> <span style="color: #800000;">    li i</span>{
<span style="color: #008080;">29</span> <span style="color: #ff0000;">background</span>:<span style="color: #0000ff;">  url(sprite.png)</span>;
<span style="color: #008080;">30</span> <span style="color: #ff0000;">display</span>:<span style="color: #0000ff;"> inline</span>;
<span style="color: #008080;">31</span> <span style="color: #ff0000;">width</span>:<span style="color: #0000ff;"> 40px</span>;
<span style="color: #008080;">32</span> <span style="color: #ff0000;">height</span>:<span style="color: #0000ff;"> 28px</span>;
<span style="color: #008080;">33</span> <span style="color: #ff0000;">float</span>:<span style="color: #0000ff;"> left</span>;
<span style="color: #008080;">34</span>     }
<span style="color: #008080;">35</span> <span style="color: #800000;">    .cat-1 i</span>{
<span style="color: #008080;">36</span> <span style="color: #ff0000;">        background-position</span>:<span style="color: #0000ff;"> -7px -5px</span>;
<span style="color: #008080;">37</span>     }
<span style="color: #008080;">38</span> <span style="color: #800000;">   .cat-2 i</span>{
<span style="color: #008080;">39</span> <span style="color: #ff0000;">        background-position</span>:<span style="color: #0000ff;"> -2px -35px</span>;
<span style="color: #008080;">40</span>     }
<span style="color: #008080;">41</span> <span style="color: #800000;">    .cat-3 i</span>{
<span style="color: #008080;">42</span> <span style="color: #ff0000;">        background-position</span>:<span style="color: #0000ff;"> -7px -65px</span>;
<span style="color: #008080;">43</span>     }
<span style="color: #008080;">44</span> <span style="color: #800000;">    .cat-4 i</span>{
<span style="color: #008080;">45</span> <span style="color: #ff0000;">        background-position</span>:<span style="color: #0000ff;"> -7px -105px</span>;
<span style="color: #008080;">46</span>     }
<span style="color: #008080;">47</span> <span style="color: #800000;">    .cat-5 i</span>{
<span style="color: #008080;">48</span> <span style="color: #ff0000;">        background-position</span>:<span style="color: #0000ff;"> -7px -129px</span>;
<span style="color: #008080;">49</span>     }
<span style="color: #008080;">50</span> <span style="color: #800000;">    .cat-6 i</span>{
<span style="color: #008080;">51</span> <span style="color: #ff0000;">        background-position</span>:<span style="color: #0000ff;"> -7px -151px</span>;
<span style="color: #008080;">52</span>     }
<span style="color: #008080;">53</span> <span style="color: #800000;">    .cat-7 i</span>{
<span style="color: #008080;">54</span> <span style="color: #ff0000;">        background-position</span>:<span style="color: #0000ff;">-60px -4px</span>;
<span style="color: #008080;">55</span>     }
<span style="color: #008080;">56</span> <span style="color: #800000;">    .cat-8 i</span>{
<span style="color: #008080;">57</span> <span style="color: #ff0000;">        background-position</span>:<span style="color: #0000ff;">-56px -33px</span>;
<span style="color: #008080;">58</span>     }
<span style="color: #008080;">59</span> <span style="color: #800000;">    .cat-9 i</span>{
<span style="color: #008080;">60</span> <span style="color: #ff0000;">        background-position</span>:<span style="color: #0000ff;"> -56px -66px</span>;
<span style="color: #008080;">61</span>     }
<span style="color: #008080;">62</span> <span style="color: #800000;">    .cat-10 i</span>{
<span style="color: #008080;">63</span> <span style="color: #ff0000;">        background-position</span>:<span style="color: #0000ff;">-60px -103px</span>;
<span style="color: #008080;">64</span>     }
<span style="color: #008080;">65</span> <span style="color: #800000;">    .cat-11 i</span>{
<span style="color: #008080;">66</span> <span style="color: #ff0000;">        background-position</span>:<span style="color: #0000ff;"> -51px -128px</span>;
<span style="color: #008080;">67</span>     }
<span style="color: #008080;">68</span> 
<span style="color: #008080;">69</span> <span style="color: #800000;">   </style></span>

7. The rendering is as follows:

That’s it for the application of sprites~~Please point out if there are any mistakes~~Hahaha