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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 22-6 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 22-6 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>/** * This constructor function creates a div element into which a * CSS-based figure can be drawn. Instance methods are defined to draw * lines and boxes and to insert the figure into the document. * * The constructor may be invoked using two different signatures: * * new CSSDrawing(x, y, width, height, classname, id) * * In this case a <div> is created using position:absolute at the * specified position and size. * * The constructor may also be invoked with only a width and height: * * new CSSDrawing(width, height, classname, id) * * In this case, the created <div> has the specified width and height * and uses position:relative (which is required so that the child * elements used to draw lines and boxes can use absolute positioning). * * In both cases, the classname and id arguments are optional. If specified, * they are used as the value of the class and id attributes of the created * <div> and can be used to associate CSS styles, such as borders with * the figure. */function CSSDrawing(/* variable arguments, see above */) { // Create and remember the <div> element for the drawing var d = this.div = document.createElement("div"); var next; // Figure out whether we have four numbers or two numbers, sizing and // positioning the div appropriately if (arguments.length >= 4 && typeof arguments[3] == "number") { d.style.position = "absolute"; d.style.left = arguments[0] + "px"; d.style.top = arguments[1] + "px"; d.style.width = arguments[2] + "px"; d.style.height = arguments[3] + "px"; next = 4; } else { d.style.position = "relative"; // This is important d.style.width = arguments[0] + "px"; d.style.height = arguments[1] + "px"; next = 2; } // Set class and id attributes if they were specified. if (arguments[next]) d.className = arguments[next]; if (arguments[next+1]) d.id = arguments[next+1];}/** * Add a box to the drawing. * * x, y, w, h: specify the position and size of the box. * content: a string of text or HTML that to appear in the box * classname, id: optional class and id values for the box. Useful to * associate styles with the box for color, border, etc. * Returns: The <div> element created to display the box */CSSDrawing.prototype.box = function(x, y, w, h, content, classname, id) { var d = document.createElement("div"); if (classname) d.className = classname; if (id) d.id = id; d.style.position = "absolute"; d.style.left = x + "px"; d.style.top = y + "px"; d.style.width = w + "px"; d.style.height = h + "px"; d.innerHTML = content; this.div.appendChild(d); return d;};/** * Add a horizontal line to the drawing. * * x, y, width: specify start position and width of the line * classname, id: optional class and id values for the box. At least one * must be present and must specify a border style which * will be used for the line style, color, and thickness. * Returns: The <div> element created to display the line */CSSDrawing.prototype.horizontal = function(x, y, width, classname, id) { var d = document.createElement("div"); if (classname) d.className = classname; if (id) d.id = id; d.style.position = "absolute"; d.style.left = x + "px"; d.style.top = y + "px"; d.style.width = width + "px"; d.style.height = 1 + "px"; d.style.borderLeftWidth = d.style.borderRightWidth = d.style.borderBottomWidth = "0px"; this.div.appendChild(d); return d;};/** * Add a vertical line to the drawing. * See horizontal() for details. */CSSDrawing.prototype.vertical = function(x, y, height, classname, id) { var d = document.createElement("div"); if (classname) d.className = classname; if (id) d.id = id; d.style.position = "absolute"; d.style.left = x + "px"; d.style.top = y + "px"; d.style.width = 1 + "px"; d.style.height = height + "px"; d.style.borderRightWidth = d.style.borderBottomWidth = d.style.borderTopWidth = "0px"; this.div.appendChild(d); return d;};/** Add the drawing to the document as a child of the specified container */CSSDrawing.prototype.insert = function(container) { if (typeof container == "string") container = document.getElementById(container); container.appendChild(this.div);}/** Add the drawing to the document by replacing the specified element */CSSDrawing.prototype.replace = function(elt) { if (typeof elt == "string") elt = document.getElementById(elt); elt.parentNode.replaceChild(this.div, elt);}</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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