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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><script>var bounce = { x:0, y:0, w:200, h:200, // Window position and size dx:5, dy:5, // Window velocity interval: 100, // Milliseconds between updates win: null, // The window we will create timer: null, // Return value of setInterval() // Start the animation start: function() { // Start with the window in the center of the screen bounce.x = (screen.width - bounce.w)/2; bounce.y = (screen.height - bounce.h)/2; // Create the window that we're going to move around // The javascript: URL is simply a way to display a short document // The final argument specifies the window size bounce.win = window.open('javascript:"<h1>BOUNCE!</h1>"', "", "left=" + bounce.x + ",top=" + bounce.y + ",width=" + bounce.w + ",height=" +bounce.h+ ",status=yes"); // Use setInterval() to call the nextFrame() method every interval // milliseconds. Store the return value so that we can stop the // animation by passing it to clearInterval(). bounce.timer = setInterval(bounce.nextFrame, bounce.interval); }, // Stop the animation stop: function() { clearInterval(bounce.timer); // Cancel timer if (!bounce.win.closed) bounce.win.close(); // Close window }, // Display the next frame of the animation. Invoked by setInterval() nextFrame: function() { // If the user closed the window, stop the animation if (bounce.win.closed) { clearInterval(bounce.timer); return; } // Bounce if we have reached the right or left edge if ((bounce.x+bounce.dx > (screen.availWidth - bounce.w)) || (bounce.x+bounce.dx < 0)) bounce.dx = -bounce.dx; // Bounce if we have reached the bottom or top edge if ((bounce.y+bounce.dy > (screen.availHeight - bounce.h)) || (bounce.y+bounce.dy < 0)) bounce.dy = -bounce.dy; // Update the current position of the window bounce.x += bounce.dx; bounce.y += bounce.dy; // Finally, move the window to the new position bounce.win.moveTo(bounce.x,bounce.y); // Display current position in window status line bounce.win.defaultStatus = "(" + bounce.x + "," + bounce.y + ")"; }}</script><button onclick="bounce.start()">Start</button><button onclick="bounce.stop()">Stop</button></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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