html让页⾯飘树叶的代码，逼真的HTML5树叶飘落动画
这是⼀款基于HTML5的树叶飘落动画，树叶都是图⽚，并⾮CSS3绘制，但是树叶飘落的动画效果⾮常逼真。这款HTML5树叶飘落动画是基于webkit内核的，也就是说要在webkit内核的浏览器上才能使⽤这款动画。
HTML代码
这是基于webkit的落叶动画
CSS代码
#container {
position: relative;
height: 700px;
width: 500px;
margin: 10px auto;
overflow: hidden;
border: 4px solid #5C090A;
background: #4E4226 url('images/backgroundLeaves.jpg') no-repeat top left;
}
/* Defines the position and dimensions of the leafContainer div */
#leafContainer
{
position: absolute;
width: 100%;
height: 100%;
}
/
* Defines the appearance, position, and dimensions of the message div */
#message
{
position: absolute;
top: 160px;
width: 100%;
height: 300px;
background:transparent url('images/textBackground.png') repeat-x center;
color: #5C090A;
font-size: 220%;
font-family: 'Georgia';
padding: 20px 10px;
-webkit-box-sizing: border-box;
-webkit-background-size: 100% 100%;
z-index: 1;
}
p {
margin: 15px;
}
a
{
color: #5C090A;
text-decoration: none;
}
/* Sets the color of the "Dino's Gardening Service" message */
em
{
font-weight: bold;
font-style: normal;
}
.phone {
font-size: 150%;
vertical-align: middle;
}
/* This CSS rule is applied to all div elements in the leafContainer div.
It styles and animates each leafDiv.
*/
#leafContainer > div
{
position: absolute;
width: 100px;
height: 100px;
/* We use the following properties to apply the fade and drop animations to each leaf. Each of these properties takes two values. These values respectively match a setting
*/
-webkit-animation-iteration-count: infinite, infinite;
-webkit-animation-direction: normal, normal;
-webkit-animation-timing-function: linear, ease-in;
}
/* This CSS rule is applied to all img elements directly inside div elements which are
directly inside the leafContainer div. In other words, it matches the 'img' elements
inside the leafDivs which are created in the createALeaf() function.
*/
#leafContainer > div > img {
position: absolute;
width: 100px;
height: 100px;
/* We use the following properties to adjust the clockwiseSpin or counterclockwiseSpinAndFlip animations on each leaf.
The createALeaf function in the Leaves.js file determines whether a leaf has the
clockwiseSpin or counterclockwiseSpinAndFlip animation.
*/
-webkit-animation-iteration-count: infinite;
-webkit-animation-direction: alternate;
-webkit-animation-timing-function: ease-in-out;
-webkit-transform-origin: 50% -100%;
}
/* Hides a leaf towards the very end of the animation */
@-webkit-keyframes fade
{
/* Show a leaf while into or below 95 percent of the animation and hide it, otherwise */
0% { opacity: 1; }
95% { opacity: 1; }
100% { opacity: 0; }
}
/* Makes a leaf fall from -300 to 600 pixels in the y-axis */
@-webkit-keyframes drop
/* Move a leaf to -300 pixels in the y-axis at the start of the animation */
0% { -webkit-transform: translate(0px, -50px); }
/
* Move a leaf to 600 pixels in the y-axis at the end of the animation */
100% { -webkit-transform: translate(0px, 650px); }
}
/* Rotates a leaf from -50 to 50 degrees in 2D space */
@-webkit-keyframes clockwiseSpin
{
/* Rotate a leaf by -50 degrees in 2D space at the start of the animation */
0% { -webkit-transform: rotate(-50deg); }
/* Rotate a leaf by 50 degrees in 2D space at the end of the animation */
100% { -webkit-transform: rotate(50deg); }
}
/
* Flips a leaf and rotates it from 50 to -50 degrees in 2D space */
@-webkit-keyframes counterclockwiseSpinAndFlip
{
/* Flip a leaf and rotate it by 50 degrees in 2D space at the start of the animation */ 0% { -webkit-transform: scale(-1, 1) rotate(50deg); }
/* Flip a leaf and rotate it by -50 degrees in 2D space at the end of the animation */ 100% { -webkit-transform: scale(-1, 1) rotate(-50deg); }
}
JavaScript代码
/* Define the number of leaves to be used in the animation */
const NUMBER_OF_LEAVES = 30;
/*
Called when the "Falling Leaves" page is completely loaded.
*/
function init()
{
/* Get a reference to the element that will contain the leaves */
var container = ElementById('leafContainer');
/* Fill the empty container with new leaves */
for (var i = 0; i < NUMBER_OF_LEAVES; i++)
container.appendChild(createALeaf());
}
js控制css3动画触发}
/
*
Receives the lowest and highest values of a range and returns a random integer that falls within that range. */
function randomInteger(low, high)
{
return low + Math.floor(Math.random() * (high - low)); }
/*
Receives the lowest and highest values of a range and returns a random float that falls within that range.
*/
function randomFloat(low, high)
{
return low + Math.random() * (high - low);
}
/*
Receives a number and returns its CSS pixel value.
*/
function pixelValue(value)
{
return value + 'px';
}
/*
Returns a duration value for the falling animation.
*/
function durationValue(value)
{
return value + 's';
}

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