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我跟着http://www.html5rocks.com/en/tutorials/casestudies/20things_pageflip.html上的教程，并得到了一切工作，但我似乎无法弄清楚如何在页面内点击任何东西。我可以使用TAB突出显示链接，然后输入以关注它，但是当我使用鼠标时，除了页面翻转动画之外，它不能识别任何其他内容。还有什么我应该添加到Javascript重新启用链接上的鼠标点击事件？页面翻转演示中的可点击链接
(function() {
// Dimensions of the whole book
var BOOK_WIDTH = 1391;
var BOOK_HEIGHT = 950;
// Dimensions of one page in the book
var PAGE_WIDTH = 651;
var PAGE_HEIGHT = 890;
// 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 = 20;
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[page].dragging = true;
}
}
// Prevents the text selection
event.preventDefault();
}
function mouseUpHandler(event) {
for(var i = 0; i < flips.length; i++) {
// If this flip was being dragged, animate to its destination
if(flips[i].dragging) {
// Figure out which page we should navigate to
if(mouse.x < 0) {
flips[i].target = -1;
page = Math.min(page + 1, flips.length);
}
else {
flips[i].target = 1;
page = Math.max(page - 1, 0);
}
}
flips[i].dragging = false;
}
}
function render() {
// Reset all pixels in the canvas
context.clearRect(0, 0, canvas.width, canvas.height);
for(var i = 0, len = flips.length; i < len; i++) {
var flip = flips[i];
if(flip.dragging) {
flip.target = Math.max(Math.min(mouse.x/PAGE_WIDTH, 1), -1);
}
// Ease progress towards the target value
flip.progress += (flip.target - flip.progress) * 0.2;
// If the flip is being dragged or is somewhere in the middle of the book, render it
if(flip.dragging || Math.abs(flip.progress) < 0.997) {
drawFlip(flip);
}
}
}
function drawFlip(flip) {
// Strength of the fold is strongest in the middle of the book
var strength = 1 - Math.abs(flip.progress);
// Width of the folded paper
var foldWidth = (PAGE_WIDTH * 0.5) * (1 - flip.progress);
// X position of the folded paper
var foldX = PAGE_WIDTH * flip.progress + foldWidth;
// How far the page should outdent vertically due to perspective
var verticalOutdent = 20 * strength;
// The maximum width of the left and right side shadows
var paperShadowWidth = (PAGE_WIDTH * 0.5) * Math.max(Math.min(1 - flip.progress, 0.5), 0);
var rightShadowWidth = (PAGE_WIDTH * 0.5) * Math.max(Math.min(strength, 0.5), 0);
var leftShadowWidth = (PAGE_WIDTH * 0.5) * Math.max(Math.min(strength, 0.5), 0);
// Change page element width to match the x position of the fold
flip.page.style.width = Math.max(foldX, 0) + "px";
context.save();
context.translate(CANVAS_PADDING + (BOOK_WIDTH/2), PAGE_Y + CANVAS_PADDING);
// Draw a sharp shadow on the left side of the page
context.strokeStyle = 'rgba(0,0,0,'+(0.05 * strength)+')';
context.lineWidth = 30 * strength;
context.beginPath();
context.moveTo(foldX - foldWidth, -verticalOutdent * 0.5);
context.lineTo(foldX - foldWidth, PAGE_HEIGHT + (verticalOutdent * 0.5));
context.stroke();
// Right side drop shadow
var rightShadowGradient = context.createLinearGradient(foldX, 0, foldX + rightShadowWidth, 0);
rightShadowGradient.addColorStop(0, 'rgba(0,0,0,'+(strength*0.2)+')');
rightShadowGradient.addColorStop(0.8, 'rgba(0,0,0,0.0)');
context.fillStyle = rightShadowGradient;
context.beginPath();
context.moveTo(foldX, 0);
context.lineTo(foldX + rightShadowWidth, 0);
context.lineTo(foldX + rightShadowWidth, PAGE_HEIGHT);
context.lineTo(foldX, PAGE_HEIGHT);
context.fill();
// Left side drop shadow
var leftShadowGradient = context.createLinearGradient(foldX - foldWidth - leftShadowWidth, 0, foldX - foldWidth, 0);
leftShadowGradient.addColorStop(0, 'rgba(0,0,0,0.0)');
leftShadowGradient.addColorStop(1, 'rgba(0,0,0,'+(strength*0.15)+')');
context.fillStyle = leftShadowGradient;
context.beginPath();
context.moveTo(foldX - foldWidth - leftShadowWidth, 0);
context.lineTo(foldX - foldWidth, 0);
context.lineTo(foldX - foldWidth, PAGE_HEIGHT);
context.lineTo(foldX - foldWidth - leftShadowWidth, PAGE_HEIGHT);
context.fill();
// Gradient applied to the folded paper (highlights & shadows)
var foldGradient = context.createLinearGradient(foldX - paperShadowWidth, 0, foldX, 0);
foldGradient.addColorStop(0.35, '#fafafa');
foldGradient.addColorStop(0.73, '#eeeeee');
foldGradient.addColorStop(0.9, '#fafafa');
foldGradient.addColorStop(1.0, '#e2e2e2');
context.fillStyle = foldGradient;
context.strokeStyle = 'rgba(0,0,0,0.06)';
context.lineWidth = 0.5;
// Draw the folded piece of paper
context.beginPath();
context.moveTo(foldX, 0);
context.lineTo(foldX, PAGE_HEIGHT);
context.quadraticCurveTo(foldX, PAGE_HEIGHT + (verticalOutdent * 2), foldX - foldWidth, PAGE_HEIGHT + verticalOutdent);
context.lineTo(foldX - foldWidth, -verticalOutdent);
context.quadraticCurveTo(foldX, -verticalOutdent * 2, foldX, 0);
context.fill();
context.stroke();
context.restore();
}
})();