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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 23-4 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 23-4 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>/** * Box.as: ActionScript code to demonstrate JavaScript <-> Flash communication * * This file is written in ActionScript 2.0, a language that is based on * JavaScript, but extended for stronger object-oriented programming. * All we're doing here is defining a single static function named main() * in a class named Box. * * You can compile this code with the open source ActionScript compiler mtasc * using a command like this: * * mtasc -header 300:300:1 -main -swf Box1.swf Box1.as * * mtasc produces a SWF file that invokes the main() method from the first * frame of the movie. If you use the Flash IDE, you must insert your own * call to Box.main() in the first frame. */class Box { static function main() { // This is an ActionScript function we want to use from JavaScript. // It draws a box and returns the area of the box. var drawBox = function(x,y,w,h) { _root.beginFill(0xaaaaaa, 100); _root.lineStyle(5, 0x000000, 100); _root.moveTo(x,y); _root.lineTo(x+w, y); _root.lineTo(x+w, y+h); _root.lineTo(x, y+h); _root.lineTo(x,y); _root.endFill(); return w*h; } // Here's how we can allow the function to be invoked from JavaScript // prior to Flash 8. First, we define properties in our root timeline // to hold the function arguments and return value. _root.arg1 = 0; _root.arg2 = 0; _root.arg3 = 0; _root.arg4 = 0; _root.result = 0; // Then we define another property with the same name as the function. _root.drawBox = 0; // Now we use the Object.watch() method to "watch" this property. // Whenever it is set, the function we specify will be called. // This means that JavaScript code can use SetVariable to trigger // a function invocation. _root.watch("drawBox", // The name of the property to watch function() { // The function to invoke when it changes // Call the drawBox() function, converting the // arguments from strings to numbers, and storing // the return value. _root.result = drawBox(Number(_root.arg1), Number(_root.arg2), Number(_root.arg3), Number(_root.arg4)); // Return 0 so that the value of the property we // are watching does not change. return 0; }); // This is an ActionScript event handler. // It calls the global fscommand() function to pass the // coordinates of a mouse click to JavaScript. _root.onMouseDown = function() { fscommand("mousedown", _root._xmouse + "," + _root._ymouse); } // Here we use fscommand() again to tell JavaScript that the // Flash movie has loaded and is ready to go. fscommand("loaded", ""); }}</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>?? 快捷鍵說明
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