jQuery / CSS3动画阴影效果 [英] jQuery / CSS3 Animated shadow effect
问题描述
所以这个问题可能会被拒绝,但我认为有人可能能够帮助。
So this question will probably get downvoted but I figure someone might be able to help.
我想找的效果是蓝色的块上下滚动一个气球,和阴影在其下生长和收缩,因为块上下循环。
The effect I am looking for is the blue block hovering up and down like a balloon, and the shadow growing and shrinking beneath it, as the block goes up and down, on a loop.
有关如何编程的任何想法,或任何人知道教程/
Any ideas on how to program this, or is anyone aware of a tutorial/plugin that might accomplish?
推荐答案
您可以使用jQuery或 CSS3 ,我会向您展示两个:
You can do it with jQuery or either with CSS3, your call, I'll show you both:
CSS3:
#box{
position:absolute;
top:100px;
left:0;
width:200px;
height:200px;
background:#6CB8E9;
-moz-animation:jump 2s infinite ease-in-out;
-webkit-animation:jump 2s infinite ease-in-out;
}
#shadow{
position:absolute;
top:290px;
height:20px;
border-radius:30px;
left: -200px;
background:transparent;
width:200px;
box-shadow:200px 0 10px 2px rgba(0,0,0,0.4);
margin-left:0;
opacity: 1;
-moz-animation:shadowSize 2s infinite ease-in-out;
-webkit-animation:shadowSize 2s infinite ease-in-out;
}
@-moz-keyframes jump {
0% { top:100px;}
50% { top:25px;}
100% { top:100px;}
}
@-webkit-keyframes jump {
0% { top:100px;}
50% { top:25px;}
100% { top:100px;}
}
@-moz-keyframes shadowSize {
0% { width:200px; margin-left:0px; opacity:1; box-shadow:200px 0 10px rgba(0,0,0,0.7);}
50% { width:150px; margin-left:25px;opacity:0.3; box-shadow:200px 0 30px rgba(0,0,0,0.3);}
100% { width:200px; margin-left:0px; opacity:1; box-shadow:200px 0 10px rgba(0,0,0,0.7);}
}
@-webkit-keyframes shadowSize {
0% { width:200px; margin-left:0px; opacity:1; box-shadow:200px 0 10px rgba(0,0,0,0.7);}
50% { width:150px; margin-left:25px;opacity:0.3; box-shadow:200px 0 30px rgba(0,0,0,0.3);}
100% { width:200px; margin-left:0px; opacity:1; box-shadow:200px 0 10px rgba(0,0,0,0.7);}
}
现在,我们亲爱的jQ ...只是使用.png图像作为阴影,而不是我的丑陋 box-shadow
:)
var li = 1; // a LoopIterations variable
function loop(){
li = ++li%2; // reset evenly to '0' // results in 0, 1, 0, 1, 0, ....
$('#shadow').animate({
width: !li ? 150:200 ,
marginLeft: !li ? 25:0 ,
opacity: !li ? 0.3:1
}, 2000);
$('#box').animate({
top: !li ? 25 : 100
},2000, loop); // THIS 'loop' callback will recall the loop() function creating ... a loop :D
}
loop(); // start loop
解释:
每次奇数迭代 li
将设置为 0
,每隔一段时间设置为 1
Javascript中的
0
可以表示为 false
,非常适合使用三元运算符,它将检查两个布尔值,例如:
[true或false statement]? [do this if true]:[do that if false];
To explain:
On every odd iteration li
will be set to 0
, and on every other to 1
thanks to %
(Modulo operator).
0
in Javascript can be represented as false
, great for the use of a ternary operator that will check for two Boolean values e.g:
[true or false statement] ? [do this if true] : [do that if false] ;
! 150:200 表示
!li
(= 0 =为false)use 200
使用 150
!li ? 150:200
means if !li
(= 0 = is false) use 200
else use 150
另外:
<div id="box"></div>
<div id="shadow"></div>
和CSS:
#box{
position:absolute;
top:100px;
width:200px;
height:200px;
background:#6CB8E9;
}
#shadow{
position:absolute;
top:310px;
height:1px;
background:rgba(0,0,0,0.26);
width:200px;
box-shadow:0 0 14px 2px #000;
margin-left:0;
opacity: 1;
}
这篇关于jQuery / CSS3动画阴影效果的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持IT屋!