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<html><!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Keywords" name="Keywords"content="JavaScript, examples, JavaScript: The Definitive Guide"><title>Example 16-6 from JavaScript: The Definitive Guide, Fifth Edition</title><style>body { font-family: arial, sans-serif}.lefttitle { font: bold x-small arial, sans-serif; margin: 5px; letter-spacing: .15em; text-transform:uppercase;}.leftcaption { font: italic x-small sans-serif; margin-bottom: 20px;}#banner { font-family:sans-serif; color:#333; font-size:x-large; font-weight:normal; padding:15px; padding-top: 3px; border-bottom:4px double #666;}#banner h1 { font-size: x-large; margin: 0px; padding: 0px;}#banner .description { font-size:large; margin-left: 2px;}pre { border: solid black 1px; background-color: #ddd; padding: 10px; margin: 0px;} </style></script></head><body><div id="banner"><h1>davidflanagan.com/javascript5</h1><span class="description">Example 16-6 from<i>JavaScript: The Definitive Guide, Fifth Edition</i></span></div><div style="float: left; 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text-align: right"><a href="index.html" tppabs="http://www.davidflanagan.com/javascript5/index.html">Table of Examples</a></div><pre>/** * AnimateCSS.js: * This file defines a function named animateCSS(), which serves as a framework * for creating CSS-based animations. The arguments to this function are: * * element: The HTML element to be animated. * numFrames: The total number of frames in the animation. * timePerFrame: The number of milliseconds to display each frame. * animation: An object that defines the animation; described below. * whendone: An optional function to call when the animation finishes. * If specified, this function is passed element as its argument. * * The animateCSS() function simply defines an animation framework. It is * the properties of the animation object that specify the animation to be * done. Each property should have the same name as a CSS style property. The * value of each property must be a function that returns values for that * style property. Each function is passed the frame number and the total * amount of elapsed time, and it can use these to compute the style value it * should return for that frame. For example, to animate an image so that it * slides in from the upper left, you might invoke animateCSS as follows: * * animateCSS(image, 25, 50, // Animate image for 25 frames of 50ms each * { // Set top and left attributes for each frame as follows: * top: function(frame,time) { return frame*8 + "px"; }, * left: function(frame,time) { return frame*8 + "px"; } * }); * **/function animateCSS(element, numFrames, timePerFrame, animation, whendone) { var frame = 0; // Store current frame number var time = 0; // Store total elapsed time // Arrange to call displayNextFrame() every timePerFrame milliseconds. // This will display each of the frames of the animation. var intervalId = setInterval(displayNextFrame, timePerFrame); // The call to animateCSS() returns now, but the previous line ensures that // the following nested function will be invoked once for each frame // of the animation. function displayNextFrame() { if (frame >= numFrames) { // First, see if we're done clearInterval(intervalId); // If so, stop calling ourselves if (whendone) whendone(element); // Invoke whendone function return; // And we're finished } // Now loop through all properties defined in the animation object for(var cssprop in animation) { // For each property, call its animation function, passing the // frame number and the elapsed time. Use the return value of the // function as the new value of the corresponding style property // of the specified element. Use try/catch to ignore any // exceptions caused by bad return values. try { element.style[cssprop] = animation[cssprop](frame, time); } catch(e) {} } frame++; // Increment the frame number time += timePerFrame; // Increment the elapsed time }}</pre><div class="lefttitle" style="padding:0px; text-align: right"><a href="index.html" tppabs="http://www.davidflanagan.com/javascript5/index.html">Table of Examples</a></div><p><script type="text/javascript">amazon_ad_tag="davidflanagancom"; amazon_ad_width="300"; amazon_ad_height="250"; amazon_ad_logo="hide";</script><script type="text/javascript" src="../../www.assoc-amazon.com/s/ads.js" tppabs="http://www.assoc-amazon.com/s/ads.js"></script></div></body></html>⌨️ 快捷键说明
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