jquery右上角帷幕下拉特效js代码

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以下是 jquery右上角帷幕下拉特效js代码的示例演示效果:

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部分效果截图:

HTML代码(index.html):

<!doctype html>  
<html lang="en">
	
	<head>
		<meta charset="utf-8">
		<title>jquery</title>
		<meta name="description" content="A playful JavaScript+CSS ribbon">
		<meta name="author" content="Hakim El Hattab">
		<!--<link href='http://fonts.googleapis.com/css?family=Lato:400,700,400italic,700italic' rel='stylesheet' type='text/css'>-->
		<link rel="stylesheet" href="css/demo.css">
		<link rel="stylesheet" href="css/forkit.css">
	</head>
	
	<body>

		<article>
			<h1></h1>
				<del>This a concept for a more playful and animated GitHub ribbon. The intention was to let you use the detached ribbon to drag down an iframe-embed of the repository on github.com but I neglected to check their X-Frame-Options until finishing most of the work.</del>
			</p>
			<small>
				Created by @hakimel 
			</small>
		</article>

		<!-- The contents (if there's no contents the ribbon acts as a link) -->
		<div class="forkit-curtain">
			<div class="close-button"></div>
			<img src="images/200.jpg">
			<img src="images/201.jpg">
			<img src="images/202.jpg">
			<img src="images/203.jpg">
		</div>

		<!-- The ribbon -->
		<a class="forkit" data-text="Top Secret" data-text-detached="Drag down >" href="js/forkit.js">
		<img style="position: absolute; top: 0; right: 0; border: 0;" src="" alt="Fork me on GitHub"></a>
		<script src="js/forkit.js"></script>
		<!-- Third party stuffs -->	
	</body>
</html>

JS代码(forkit.js):

/*! * forkit.js 0.2 * http://lab.hakim.se/forkit-js * MIT licensed * * Created by Hakim El Hattab,http://hakim.se */
(function(){
	var STATE_CLOSED = 0,STATE_DETACHED = 1,STATE_OPENED = 2,TAG_HEIGHT = 30,TAG_WIDTH = 200,MAX_STRAIN = 40,// Factor of page height that needs to be dragged for the// curtain to fallDRAG_THRESHOLD = 0.36;
	VENDORS = [ 'Webkit','Moz','O','ms' ];
	var dom ={
	ribbon:null,ribbonString:null,ribbonTag:null,curtain:null,closeButton:null}
,// The current state of the ribbonstate = STATE_CLOSED,// Ribbon text,correlates to statesclosedText = '',detachedText = '',friction = 1.04;
	gravity = 1.5,// Resting position of the ribbon when curtain is closedclosedX = TAG_WIDTH * 0.4,closedY = -TAG_HEIGHT * 0.5,// Resting position of the ribbon when curtain is openedopenedX = TAG_WIDTH * 0.4,openedY = TAG_HEIGHT,velocity = 0,rotation = 45,curtainTargetY = 0,curtainCurrentY = 0,dragging = false,dragTime = 0,dragY = 0,anchorA = new Point( closedX,closedY ),anchorB = new Point( closedX,closedY ),mouse = new Point();
	function initialize(){
	dom.ribbon = document.querySelector( '.forkit' );
	dom.curtain = document.querySelector( '.forkit-curtain' );
	dom.closeButton = document.querySelector( '.forkit-curtain .close-button' );
	if( dom.ribbon ){
	// Fetch label texts from DOMclosedText = dom.ribbon.getAttribute( 'data-text' ) || '';
	detachedText = dom.ribbon.getAttribute( 'data-text-detached' ) || closedText;
	// Construct the sub-elements required to represent the// tag and string that it hangs fromdom.ribbon.innerHTML = '<span class="string"></span><span class="tag">' + closedText + '</span>';
	dom.ribbonString = dom.ribbon.querySelector( '.string' );
	dom.ribbonTag = dom.ribbon.querySelector( '.tag' );
	// Bind eventsdom.ribbon.addEventListener( 'click',onRibbonClick,false );
	document.addEventListener( 'mousemove',onMouseMove,false );
	document.addEventListener( 'mousedown',onMouseDown,false );
	document.addEventListener( 'mouseup',onMouseUp,false );
	document.addEventListener( 'touchstart',onTouchStart,false);
	document.addEventListener( 'touchmove',onTouchMove,false);
	document.addEventListener( 'touchend',onTouchEnd,false);
	window.addEventListener( 'resize',layout,false );
	if( dom.closeButton ){
	dom.closeButton.addEventListener( 'click',onCloseClick,false );
}
// Start the animation loopanimate();
}
}
function onMouseDown( event ){
	if( dom.curtain && state === STATE_DETACHED ){
	event.preventDefault();
	dragY = event.clientY;
	dragTime = Date.now();
	dragging = true;
}
}
function onMouseMove( event ){
	mouse.x = event.clientX;
	mouse.y = event.clientY;
}
function onMouseUp( event ){
	if( state !== STATE_OPENED ){
	state = STATE_CLOSED;
	dragging = false;
}
}
function onTouchStart( event ){
	if( dom.curtain && state === STATE_DETACHED ){
	event.preventDefault();
	var touch = event.touches[0];
	dragY = touch.clientY;
	dragTime = Date.now();
	dragging = true;
}
}
function onTouchMove( event ){
	var touch = event.touches[0];
	mouse.x = touch.pageX;
	mouse.y = touch.pageY;
}
function onTouchEnd( event ){
	if( state !== STATE_OPENED ){
	state = STATE_CLOSED;
	dragging = false;
}
}
function onRibbonClick( event ){
	if( dom.curtain ){
	event.preventDefault();
	if( state === STATE_OPENED ){
	close();
}
else if( Date.now() - dragTime < 300 ){
	open();
}
}
}
function onCloseClick( event ){
	event.preventDefault();
	close();
}
function layout(){
	if( state === STATE_OPENED ){
	curtainTargetY = window.innerHeight;
	curtainCurrentY = curtainTargetY;
}
}
function open(){
	dragging = false;
	state = STATE_OPENED;
}
function close(){
	dragging = false;
	state = STATE_CLOSED;
	dom.ribbonTag.innerHTML = closedText;
}
function detach(){
	state = STATE_DETACHED;
	dom.ribbonTag.innerHTML = detachedText;
}
function animate(){
	update();
	render();
	requestAnimFrame( animate );
}
function update(){
	// Distance between mouse and top right cornervar distance = distanceBetween( mouse.x,mouse.y,window.innerWidth,0 );
	// If we're OPENED the curtainTargetY should ease towards page bottomif( state === STATE_OPENED ){
	curtainTargetY = Math.min( curtainTargetY + ( window.innerHeight - curtainTargetY ) * 0.2,window.innerHeight );
}
else{
	// Detach the tag when hovering close enoughif( distance < TAG_WIDTH * 1.5 ){
	detach();
}
// Re-attach the tag if the user moved awayelse if( !dragging && state === STATE_DETACHED && distance > TAG_WIDTH * 2 ){
	close();
}
if( dragging ){
	// Updat the curtain position while draggingcurtainTargetY = Math.max( mouse.y - dragY,0 );
	// If the threshold is crossed,open the curtainif( curtainTargetY > window.innerHeight * DRAG_THRESHOLD ){
	open();
}
}
else{
	curtainTargetY *= 0.8;
}
}
// Ease towards the target position of the curtaincurtainCurrentY += ( curtainTargetY - curtainCurrentY ) * 0.3;
	// If we're dragging or detached we need to simulate// the physical behavior of the ribbonif( dragging || state === STATE_DETACHED ){
	// Apply forcesvelocity /= friction;
	velocity += gravity;
	var containerOffsetX = dom.ribbon.offsetLeft;
	var offsetX = Math.max( ( ( mouse.x - containerOffsetX ) - closedX ) * 0.2,-MAX_STRAIN );
	anchorB.x += ( ( closedX + offsetX ) - anchorB.x ) * 0.1;
	anchorB.y += velocity;
	var strain = distanceBetween( anchorA.x,anchorA.y,anchorB.x,anchorB.y );
	if( strain > MAX_STRAIN ){
	velocity -= Math.abs( strain ) / ( MAX_STRAIN * 1.25 );
}
var dy = Math.max( mouse.y - anchorB.y,0 ),dx = mouse.x - ( containerOffsetX + anchorB.x );
	// Angle the ribbon towards the mouse but limit it avoid extremesvar angle = Math.min( 130,Math.max( 50,Math.atan2( dy,dx ) * 180 / Math.PI ) );
	rotation += ( angle - rotation ) * 0.1;
}
// Ease ribbon towards the OPENED stateelse if( state === STATE_OPENED ){
	anchorB.x += ( openedX - anchorB.x ) * 0.2;
	anchorB.y += ( openedY - anchorB.y ) * 0.2;
	rotation += ( 90 - rotation ) * 0.02;
}
// Ease ribbon towards the CLOSED stateelse{
	anchorB.x += ( anchorA.x - anchorB.x ) * 0.2;
	anchorB.y += ( anchorA.y - anchorB.y ) * 0.2;
	rotation += ( 45 - rotation ) * 0.2;
}
}
function render(){
	if( dom.curtain ){
	dom.curtain.style.top = - 100 + Math.min( ( curtainCurrentY / window.innerHeight ) * 100,100 ) + '%';
}
dom.ribbon.style[ prefix( 'transform' ) ] = transform( 0,curtainCurrentY,0 );
	dom.ribbonTag.style[ prefix( 'transform' ) ] = transform( anchorB.x,anchorB.y,rotation );
	var dy = anchorB.y - anchorA.y,dx = anchorB.x - anchorA.x;
	var angle = Math.atan2( dy,dx ) * 180 / Math.PI;
	dom.ribbonString.style.width = anchorB.y + 'px';
	dom.ribbonString.style[ prefix( 'transform' ) ] = transform( anchorA.x,0,angle );
}
function prefix( property,el ){
	var propertyUC = property.slice( 0,1 ).toUpperCase() + property.slice( 1 );
	for( var i = 0,len = VENDORS.length;
	i < len;
	i++ ){
	var vendor = VENDORS[i];
	if( typeof ( el || document.body ).style[ vendor + propertyUC ] !== 'undefined' ){
	return vendor + propertyUC;
}
}
return property;
}
function transform( x,y,r ){
	return 'translate('+x+'px,'+y+'px) rotate('+r+'deg)';
}
function distanceBetween( x1,y1,x2,y2 ){
	var dx = x1-x2;
	var dy = y1-y2;
	return Math.sqrt(dx*dx + dy*dy);
}
/** * Defines a 2D position. */
function Point( x,y ){
	this.x = x || 0;
	this.y = y || 0;
}
Point.prototype.distanceTo = function( x,y ){
	var dx = x-this.x;
	var dy = y-this.y;
	return Math.sqrt(dx*dx + dy*dy);
}
;
	Point.prototype.clone = function(){
	return new Point( this.x,this.y );
}
;
	Point.prototype.interpolate = function( x,y,amp ){
	this.x += ( x - this.x ) * amp;
	this.y += ( y - this.y ) * amp;
}
;
	window.requestAnimFrame = (function(){
	return window.requestAnimationFrame||window.webkitRequestAnimationFrame||window.mozRequestAnimationFrame||window.oRequestAnimationFrame||window.msRequestAnimationFrame||function( callback ){
	window.setTimeout(callback,1000 / 60);
}
;
}
)();
	initialize();
}
)();

CSS代码(demo.css):

body{background:#323232;font-family:'Lato',Times,'Times New Roman',serif;font-size:16px;color:#eee;overflow:hidden;}
a{color:#74e685;text-decoration:none;-webkit-transition:0.15s color ease;-moz-transition:0.15s color ease;-ms-transition:0.15s color ease;-o-transition:0.15s color ease;transition:0.15s color ease;}
a:hover{color:#d3f3d7;}
article{display:inline-block;margin:20px;width:480px;}
h1,h2{font-size:24px;display:inline-block;}
h2{color:#ccc;}
p{margin:10px 0 10px 0;font-size:15px;}
small{display:block;margin:10px 0 20px 0;color:#bbb;}
del{opacity:0.3;}
.sharing{position:absolute;bottom:16px;left:20px;}
.forkit-curtain{text-align:center;background:rgba( 0,0,0,0.8 );padding-top:10%;}
.forkit-curtain .close-button{position:absolute;width:32px;height:32px;right:20px;top:20px;cursor:pointer;background:url(data:image/gif;base64,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);}

CSS代码(forkit.css):

*{margin:0px;padding:0px;-webkit-box-sizing:border-box;-moz-box-sizing:border-box;box-sizing:border-box;}
.forkit{position:absolute;right:0;top:0;width:200px;height:150px;font-family:'Lato',sans-serif;text-decoration:none;}
.forkit .tag{display:block;height:30px;width:200px;color:#fff;background:#aa0000;text-align:center;font-size:13px;font-weight:bold;line-height:30px;box-shadow:0px 0px 10px rgba( 0,0,0,0.4 );-webkit-transform-origin:15px 0px;-moz-transform-origin:15px 0px;-ms-transform-origin:15px 0px;-o-transform-origin:15px 0px;transform-origin:15px 0px;}
.forkit .tag:after{content:'';display:block;position:absolute;top:0;left:0;width:196px;height:26px;margin:1px;border:1px solid rgba( 255,255,255,0.4 );}
.forkit .string{display:block;height:1px;width:0px;position:absolute;background:rgba( 255,255,255,0.7 );box-shadow:0px 0px 10px rgba( 0,0,0,0.4 );-webkit-transform-origin:0px 0px;-moz-transform-origin:0px 0px;-ms-transform-origin:0px 0px;-o-transform-origin:0px 0px;transform-origin:0px 0px;}
.forkit-curtain{position:absolute;width:100%;height:100%;top:-100%;}

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