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H5 image mask

高洛峰Original: 2016-10-12 10:55:322710browse

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(1) Knowledge preparation

a.transform-origin

transform-origin: x-axis y-axis z-axis;

x-axis values are for example left, center, right, length, %, default center is 50%, which refers to the position of the origin of the x-axis coordinate relative to the width of the element. For example, the y-axis values are top, center, bottom, and length. %. The default center is 50%, which refers to the origin of the y-axis coordinate relative to the width of the element. At the high position of the element

H5 image mask I personally feel that it would be better to swap the values of x-axis and y-axis. You can have this understanding: draw the y-axis on the left and draw the x-axis on the center. Then the two The intersection of the axes is the origin of the coordinate axis

b. The combination of transition and transformation

transition-duration:500ms;

transform:rotate(0deg)

It takes 500ms to rotate the element to 0 degrees

c. #lol: hover p:nth-child(2)

When the mouse is placed on the element A with the id of lol, if the second one of all the child elements of A is a p element, the match is successful.

d.Key code

#lol:hover p:nth-child(2)/*鼠标放在p元素上时触发*/
      {
           transform:rotate(0deg)
           /*等价于transform:translate(0px,0px) rotate(0deg) 不要忘记默认属性*/
           /* transition-duration:500ms;transform-origin:right bottom;不写也是一样的，因为#lol p:nth-child(2)设置了*/
      }
      #lol p:nth-child(2)/*浏览器显示p元素时执行*/
      {
           transition-duration:500ms;
           transform-origin:right bottom;
           transform:rotate(90deg);
           …
      }

(2) All codes

<!DOCTYPE html>
<html>
<head>
<meta charset=utf-8>
<link rel="shortcut icon" href="favicon.ico" type="image/x-icon">
<title>为了生活</title>
<style type="text/css">
      *
      {
           margin:0px;
           padding:0;
      }
      #lol
      {
           width:222px;
           height:221px;
           position:relative;
           overflow:hidden;
           cursor:pointer;
           margin:20px auto;
           border:10px #333 solid;
     
      }
      #lol:hover p:nth-child(2)
      {
           transform:rotate(0deg)
      }
      #lol p:nth-child(2)
      {
           width:222px;
           height:221px;
           position:absolute;
           transition-duration:500ms;
           transform-origin:right bottom;
           transform:rotate(90deg);
           background:orange;
           top:0px;
           left:0px;
      }
</style>    
</head
<body>
      <div id="lol">
           <img  src="images/H5 image mask" alt="H5 image mask" >
           <p>Hello World</p>
      </div>
</body>              
</html>

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