转自:https://www.jb51.net/article/85475.htm
实现弹出层效果的思路非常简单:将待显示的内容先隐藏,在触发某种条件后(如点击按钮),将原本隐藏的内容显示出来。
实现
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
|
<!DOCTYPE html> <html> <head> <title>Window对象</title> <meta charset= "utf-8" > </head> <body> <button type= "button" id= "open" >打开弹出层</button> <div style= "display: none;background: lightblue;border:1px solid green;" id= "toast" > <!-- 设置display属性为none以隐藏内容 --> <p>这里是弹出层内容</p> <button type= "button" id= "close" >关闭弹出层</button> </div> <script type= "text/javascript" > var toast = document.getElementById( "toast" ); document.getElementById( "open" ).onclick = function (e){ <!-- 定义点击事件显示隐藏内容 --> toast.style.display = "block" ; toast.style.position = "fixed" ; var winWidth = window.innerWidth; var winHeight = window.innerHeight; var targetWidth = toast.offsetWidth; var targetHeight = toast.offsetHeight; toast.style.top = (winHeight - targetHeight) / 2 + "px" ; toast.style.left = (winWidth - targetWidth) / 2 + "px" ; } document.getElementById( "close" ).onclick = function (e){ <!-- 将显示的内容再次隐藏 --> toast.style.display = "none" ; } </script> </body> </html> |
显示效果如下:
但是我们可以注意到,在弹出隐藏内容之后我们还是可以通过链接进入百度页面。为了防止这种情况的发生,我们可以提供遮罩层将原先的页面内容全部遮住。代码如下:
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
|
<!DOCTYPE html> <html> <head> <title>Window对象</title> <meta charset= "utf-8" > </head> <body> <button type= "button" id= "open" >打开弹出层</button> <div id= "cover" style= "display: none;position: fixed; 100%;height: 100%;top:0px;left:0px;background: gray;" > <!-- 通过遮罩层遮住背景 --> <div style= "background: lightblue;border:1px solid green;" id= "toast" > <!-- 设置display属性为none以隐藏内容 --> <p>这里是弹出层内容</p> <button type= "button" id= "close" >关闭弹出层</button> </div> </div> <script type= "text/javascript" > var toast = document.getElementById( "toast" ); var cover = document.getElementById( "cover" ); document.getElementById( "open" ).onclick = function (e){ <!-- 定义点击事件显示隐藏内容 --> cover.style.display = "block" ; toast.style.position = "fixed" ; var winWidth = window.innerWidth; var winHeight = window.innerHeight; var targetWidth = toast.offsetWidth; var targetHeight = toast.offsetHeight; toast.style.top = (winHeight - targetHeight) / 2 + "px" ; toast.style.left = (winWidth - targetWidth) / 2 + "px" ; } document.getElementById( "close" ).onclick = function (e){ <!-- 将显示的内容再次隐藏 --> cover.style.display = "none" ; } </script> </body> </html> |
这是再次测试下效果,如下图:
总结
上述内容只是简单实现了弹出层效果,但是通过添加更多的代码也可以在此基础上实现更复杂的功能。