原生JS實現拖拽翻書特效第1/2頁
本文給大傢分享一個用原生JS實現的拖拽翻書效果圖，效果如下：
效果還不錯吧，當然還需要兩個圖片。
1.書本封面。
2.書頁
實現代碼如下，歡迎大傢復制粘貼。
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>原生JS實現拖拽翻書特效</title>
<style>
body,
h2,
p {
margin: 0;
padding: 0;
}
body {
background-color: #444;
color: #333;
font-family: Helvetica, sans-serif;
}
#book {
/* 書本封面 */
background: url("images/0.png") no-repeat;
position: absolute;
width: 830px;
height: 260px;
left: 50%;
top: 50%;
margin-left: -400px;
margin-top: -125px;
}
#pages section {
/* 書本頁 */
background: url("images/1.png") no-repeat;
display: block;
width: 400px;
height: 250px;
position: absolute;
left: 415px;
top: 5px;
overflow: hidden;
}
#pages section>div {
display: block;
width: 400px;
height: 250px;
font-size: 12px;
}
#pages section p,
#pages section h2 {
padding: 3px 35px;
line-height: 1.4em;
text-align: justify;
}
#pages section h2 {
margin: 15px 0 10px;
}
#pageflip-canvas {
position: absolute;
z-index: 100;
}
</style>
</head>
<body>
<div id="book">
<canvas id="pageflip-canvas"></canvas>
<div id="pages">
<section>
<div>
<h2>History</h2>
<p>
Canvas was initially introduced by Apple for use inside their own Mac OS X WebKit component,
powering applications like Dashboard widgets and the Safari browser. Later, it was adopted by
Gecko browsers and Opera and standardized by the WHATWG on new proposed specifications for next
generation web technologies.
</p>
</div>
</section>
<section>
<div>
<h2>Usage</h2>
<p>
Canvas consists of a drawable region defined in HTML code with height and width attributes.
JavaScript code may access the area through a full set of drawing functions similar to other
common 2D APIs, thus allowing for dynamically generated graphics. Some anticipated uses of
canvas include building graphs, animations, games, and image composition.
</p>
</div>
</section>
<section>
<div>
<h2>Reactions</h2>
<p>
At the time of its introduction the canvas element was met with mixed reactions from the web
standards community. There have been arguments against Apple's decision to create a new
proprietary element instead of supporting the SVG standard. There are other concerns about
syntax e.g. the absence of a namespace.
</p>
</div>
</section>
<section>
<div>
<h2>Support</h2>
<p>
The element is currently supported by the latest versions of Mozilla Firefox, Google Chrome,
Safari, and Opera. It is not natively implemented by Internet Explorer (IE) as of version 8,
though support is in development for Internet Explorer 9; however, many of the Canvas element's
features can be supported in IE, for example by using Google or Mozilla plugins, JavaScript
libraries and either Adobe Flash or IE's proprietary VML.
</p>
</div>
</section>
</div>
</div>
<script type="text/javascript" src="js/index.js"></script>
</body>
<html>
以下上面代碼中引入的index.js代碼，為核心代碼。
(function () {
// Dimensions of the whole book
var BOOK_WIDTH = 830;
var BOOK_HEIGHT = 260;
// Dimensions of one page in the book
var PAGE_WIDTH = 400;
var PAGE_HEIGHT = 250;
// Vertical spacing between the top edge of the book and the papers
var PAGE_Y = (BOOK_HEIGHT - PAGE_HEIGHT) / 2;
// The canvas size equals to the book dimensions + this padding
var CANVAS_PADDING = 60;
var page = 0;
var canvas = document.getElementById("pageflip-canvas");
var context = canvas.getContext("2d");
var mouse = { x: 0, y: 0 };
var flips = [];
var book = document.getElementById("book");
// List of all the page elements in the DOM
var pages = book.getElementsByTagName("section");
// Organize the depth of our pages and create the flip definitions
for (var i = 0, len = pages.length; i < len; i++) {
pages[i].style.zIndex = len - i;
flips.push({
// Current progress of the flip (left -1 to right +1)
progress: 1,
// The target value towards which progress is always moving
target: 1,
// The page DOM element related to this flip
page: pages[i],
// True while the page is being dragged
dragging: false
});
}
// Resize the canvas to match the book size
canvas.width = BOOK_WIDTH + (CANVAS_PADDING * 2);
canvas.height = BOOK_HEIGHT + (CANVAS_PADDING * 2);
// Offset the canvas so that it's padding is evenly spread around the book
canvas.style.top = -CANVAS_PADDING + "px";
canvas.style.left = -CANVAS_PADDING + "px";
// Render the page flip 60 times a second
setInterval(render, 1000 / 60);
document.addEventListener("mousemove", mouseMoveHandler, false);
document.addEventListener("mousedown", mouseDownHandler, false);
document.addEventListener("mouseup", mouseUpHandler, false);
function mouseMoveHandler(event) {
// Offset mouse position so that the top of the book spine is 0,0
mouse.x = event.clientX - book.offsetLeft - (BOOK_WIDTH / 2);
mouse.y = event.clientY - book.offsetTop;
}
function mouseDownHandler(event) {
// Make sure the mouse pointer is inside of the book
if (Math.abs(mouse.x) < PAGE_WIDTH) {
if (mouse.x < 0 && page - 1 >= 0) {
// We are on the left side, drag the previous page
flips[page - 1].dragging = true;
} else if (mouse.x > 0 && page + 1 < flips.length) {
// We are on the right side, drag the current page
flips
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