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Converted to HTML in WebWorks Publisher 2000. manual wdt 1.5"> <META NAME="LASTUPDATED" CONTENT="09/28/00 13:15:52"> <TITLE> Core JavaScript Reference 1.5: </TITLE></HEAD><BODY TEXT="#000000" LINK="#666699" VLINK="#666699" ALINK="#333366" BGCOLOR="#FFFFFF"><MAINCONTENT><NAVIGATIONCONTENT> <TABLE WIDTH="100%" BORDER="0" CELLSPACING="4"> <TR> <TD VALIGN="TOP"> <b><a href="object.html"><FONT FACE="Arial, Helvetica, sans-serif" SIZE="2" COLOR="#993300">Previous</a></FONT> </b><a href="contents.html"><b><FONT FACE="Arial, Helvetica, sans-serif" SIZE="2" COLOR="#993300">Contents</a></FONT></b> <a href="ix.html"><b><FONT FACE="Arial, Helvetica, sans-serif" SIZE="2" COLOR="#993300">Index</a></FONT></b> <a href="regexp.html"><b><FONT FACE="Arial, Helvetica, sans-serif" SIZE="2" COLOR="#993300">Next</a></FONT></b> </TD> </TR> <TR> <TD VALIGN="TOP" ALIGN="RIGHT" BGCOLOR="#CCCCCC"> <FONT FACE="Arial, Helvetica, sans-serif" COLOR="#000000" SIZE="2"><B> Core JavaScript Reference 1.5</B></FONT> </TD> </TR> <TR> </TABLE> <BR></NAVIGATIONCONTENT><BOOKCONTENT> <blockquote><BR><BR> <BR><BR><P><A NAME="1193137"> </A><A NAME="Packages"> </A><FONT FACE="Arial, Helvetica, sans-serif" SIZE="5"><B><zrefhead1>Packages</zrefhead1></B></FONT><P><A NAME="1193151"> </A><FONT FACE="Arial, Helvetica, sans-serif" SIZE="2"><zparagraph>A top-level object used to access Java classes from within JavaScript code.<BR><P><TABLE WIDTH="90%" BORDER="1" CELLPADDING="5" CELLSPACING="0"> <CAPTION></CAPTION><P><FONT FACE=""><B></B></FONT><BR><BR> <TR> <TD VALIGN=TOP><P><A NAME="1193140"> </A><FONT FACE="Arial, Helvetica, sans-serif" SIZE="2"><ztabletext><I>Core object</I></ztabletext></FONT> </TD> <TD VALIGN=TOP><P><A NAME="1193142"> </A><FONT FACE="Arial, Helvetica, sans-serif" SIZE="2"><ztabletext></ztabletext></FONT> </TD> </TR> <TR> <TD VALIGN=TOP><P><A NAME="1193144"> </A><FONT FACE="Arial, Helvetica, sans-serif" SIZE="2"><ztabletext><I>Implemented in</I></ztabletext></FONT> </TD> <TD VALIGN=TOP><P><A NAME="1193146"> </A><FONT FACE="Arial, Helvetica, sans-serif" SIZE="2"><ztabletext>JavaScript 1.1, NES 2.0</ztabletext></FONT> </TD> </TR></TABLE><P></zparagraph></FONT><P><BR><A NAME="1193152"> </A><A NAME="Created by"> </A><FONT FACE="Arial, Helvetica, sans-serif" SIZE="2"><B><zrefheader>Created by</zrefheader></B></FONT><BR><A NAME="1193153"> </A><FONT FACE="Arial, Helvetica, sans-serif" SIZE="2"><zparagraph>The <FONT FACE="courier, couriernew, monospaced size">Packages</FONT> object is a top-level, predefined JavaScript object. You can automatically access it without using a constructor or calling a method.</zparagraph></FONT><P><BR><A NAME="1193162"> </A><A NAME="Description"> </A><FONT FACE="Arial, Helvetica, sans-serif" SIZE="2"><B><zrefheader>Description</zrefheader></B></FONT><BR><A NAME="1193168"> </A><FONT FACE="Arial, Helvetica, sans-serif" SIZE="2"><zparagraph>The <FONT FACE="courier, couriernew, monospaced size">Packages</FONT> object lets you access the public methods and fields of an arbitrary Java class from within JavaScript. The <FONT FACE="courier, couriernew, monospaced size">java</FONT>, <FONT FACE="courier, couriernew, monospaced size">netscape</FONT>, and <FONT FACE="courier, couriernew, monospaced size">sun</FONT> properties represent the packages java.*, netscape.*, and sun.* respectively. Use standard Java dot notation to access the classes, methods, and fields in these packages. For example, you can access a constructor of the <FONT FACE="courier, couriernew, monospaced size">Frame</FONT> class as follows:</zparagraph></FONT><P><A NAME="1195024"></A><FONT FACE="courier, couriernew, monospaced size" SIZE="2"><zcodeline>var theFrame = new Packages.java.awt.Frame();</zcodeline></FONT><P><A NAME="1195010"> </A><FONT FACE="Arial, Helvetica, sans-serif" SIZE="2"><zparagraph>For convenience, JavaScript provides the top-level <FONT FACE="courier, couriernew, monospaced size">netscape</FONT>, <FONT FACE="courier, couriernew, monospaced size">sun</FONT>, and <FONT FACE="courier, couriernew, monospaced size">java</FONT> objects that are synonyms for the <FONT FACE="courier, couriernew, monospaced size">Packages</FONT> properties with the same names. Consequently, you can access Java classes in these packages without the Packages keyword, as follows:</zparagraph></FONT><P><A NAME="1195072"></A><FONT FACE="courier, couriernew, monospaced size" SIZE="2"><zcodeline>var theFrame = new java.awt.Frame();</zcodeline></FONT><P><A NAME="1195041"> </A><FONT FACE="Arial, Helvetica, sans-serif" SIZE="2"><zparagraph>The <FONT FACE="courier, couriernew, monospaced size">className</FONT> property represents the fully qualified path name of any other Java class that is available to JavaScript. You must use the <FONT FACE="courier, couriernew, monospaced size">Packages</FONT> object to access classes outside the <FONT FACE="courier, couriernew, monospaced size">netscape</FONT>, <FONT FACE="courier, couriernew, monospaced size">sun</FONT>, and <FONT FACE="courier, couriernew, monospaced size">java</FONT> packages.</zparagraph></FONT><P><BR><A NAME="1193174"> </A><A NAME="Property Summary"> </A><FONT FACE="Arial, Helvetica, sans-serif" SIZE="2"><B><zrefheader>Property Summary</zrefheader></B></FONT><BR><A NAME="1193187"> </A><FONT FACE="Arial, Helvetica, sans-serif" SIZE="2"><zparagraph><BR><P><TABLE WIDTH="90%" BORDER="1" CELLPADDING="5" CELLSPACING="0"> <CAPTION></CAPTION><P><FONT FACE=""><B></B></FONT><BR><BR> <TR BGCOLOR="#CCCCCC" ALIGN=LEFT VALIGN=TOP> <TH VALIGN=TOP ALIGN=LEFT><A NAME="1193177"> </A><P ALIGN="LEFT"><FONT FACE="Arial, Helvetica, sans-serif" SIZE="2"><B><ztablehead>Property</ztablehead></B></FONT></TH> <TH VALIGN=TOP ALIGN=LEFT><A NAME="1193179"> </A><P ALIGN="LEFT"><FONT FACE="Arial, Helvetica, sans-serif" SIZE="2"><B><ztablehead>Description</ztablehead></B></FONT></TH> </DIV></TR> <TR> <TD VALIGN=TOP><A NAME="1194662"></A><FONT FACE="courier, couriernew, monospaced size" SIZE="2"><zcodeline><A HREF="packages.html#1194741" >className</A></zcodeline></FONT><P> </TD> <TD VALIGN=TOP><P><A NAME="1194664"> </A><FONT FACE="Arial, Helvetica, sans-serif" SIZE="2"><ztabletext>The fully qualified name of a Java class in a package other than netscape, java, or sun that is available to JavaScript.</ztabletext></FONT> </TD> </TR> <TR> <TD VALIGN=TOP><A NAME="1194642"></A><FONT FACE="courier, couriernew, monospaced size" SIZE="2"><zcodeline><A HREF="packages.html#1194831" >java</A></zcodeline></FONT><P> </TD> <TD VALIGN=TOP><P><A NAME="1194644"> </A><FONT FACE="Arial, Helvetica, sans-serif" SIZE="2"><ztabletext>Any class in the Java package java.*.</ztabletext></FONT> </TD> </TR> <TR> <TD VALIGN=TOP><A NAME="1194650"></A><FONT FACE="courier, couriernew, monospaced size" SIZE="2"><zcodeline><A HREF="packages.html#1194854" >netscape</A></zcodeline></FONT><P> </TD> <TD VALIGN=TOP><P><A NAME="1194652"> </A><FONT FACE="Arial, Helvetica, sans-serif" SIZE="2"><ztabletext>Any class in the Java package netscape.*.</ztabletext></FONT> </TD> </TR> <TR> <TD VALIGN=TOP><A NAME="1193184"></A><FONT FACE="courier, couriernew, monospaced size" SIZE="2"><zcodeline><A HREF="packages.html#1194880" >sun</A></zcodeline></FONT><P> </TD> <TD VALIGN=TOP><P><A NAME="1193186"> </A><FONT FACE="Arial, Helvetica, sans-serif" SIZE="2"><ztabletext>Any class in the Java package sun.*.</ztabletext></FONT> </TD> </TR></TABLE><P></zparagraph></FONT><P><BR><A NAME="1193209"> </A><A NAME="Examples"> </A><FONT FACE="Arial, Helvetica, sans-serif" SIZE="2"><B><zrefheader>Examples</zrefheader></B></FONT><BR><A NAME="1194739"></A><FONT FACE="courier, couriernew, monospaced size" SIZE="2"><zcodeline>The following JavaScript function creates a Java dialog box:</zcodeline></FONT><P><A NAME="1195233"></A><FONT FACE="courier, couriernew, monospaced size" SIZE="2"><zcodeline>function createWindow() {<br> var theOwner = new Packages.java.awt.Frame();<br> var theWindow = new Packages.java.awt.Dialog(theOwner);<br> theWindow.setSize(350,200);<br> theWindow.setTitle("Hello, World");<br> theWindow.setVisible(true);<br>}</zcodeline></FONT><P><A NAME="1195227"> </A><FONT FACE="Arial, Helvetica, sans-serif" SIZE="2"><zparagraph>In the previous example, the function instantiates <FONT FACE="courier, couriernew, monospaced size">theWindow</FONT> as a new <FONT FACE="courier, couriernew, monospaced size">Packages</FONT> object. The <FONT FACE="courier, couriernew, monospaced size">setSize</FONT>, <FONT FACE="courier, couriernew, monospaced size">setTitle</FONT>, and <FONT FACE="courier, couriernew, monospaced size">setVisible</FONT> methods are all available to JavaScript as public methods of <FONT FACE="courier, couriernew, monospaced size">java.awt.Dialog</FONT>.</zparagraph></FONT><P><BR><P><A NAME="1194741"> </A><A NAME="className"> </A><FONT FACE="Arial, Helvetica, sans-serif" SIZE="4"><B><zrefhead2>className</zrefhead2></B></FONT><P><A NAME="1195314"> </A><FONT FACE="Arial, Helvetica, sans-serif" SIZE="2"><zparagraph>The fully qualified name of a Java class in a package other than <FONT FACE="courier, couriernew, monospaced size">netscape</FONT>, <FONT FACE="courier, couriernew, monospaced size">java</FONT>, or <FONT FACE="courier, couriernew, monospaced size">sun</FONT> that is available to JavaScript.<BR><P><TABLE WIDTH="90%" BORDER="1" CELLPADDING="5" CELLSPACING="0"> <CAPTION></CAPTION><P><FONT FACE=""><B></B></FONT><BR><BR> <TR> <TD VALIGN=TOP><P><A NAME="1194748"> </A><FONT FACE="Arial, Helvetica, sans-serif" SIZE="2"><ztabletext><I>Property of</I></ztabletext></FONT> </TD> <TD VALIGN=TOP><P><A NAME="1194753"> </A><FONT FACE="Arial, Helvetica, sans-serif" SIZE="2"><ztabletext><A HREF="packages.html#1193137" >Packages</A></ztabletext></FONT> </TD> </TR> <TR> <TD VALIGN=TOP><P><A NAME="1194755"> </A><FONT FACE="Arial, Helvetica, sans-serif" SIZE="2"><ztabletext><I>Implemented in</I></ztabletext></FONT> </TD> <TD VALIGN=TOP><P><A NAME="1194757"> </A><FONT FACE="Arial, Helvetica, sans-serif" SIZE="2"><ztabletext>JavaScript 1.1, NES 2.0</ztabletext></FONT> </TD> </TR></TABLE><P></zparagraph></FONT><P><BR><A NAME="1195384"> </A><A NAME="Syntax"> </A><FONT FACE="Arial, Helvetica, sans-serif" SIZE="2"><B><zrefheader>Syntax</zrefheader></B></FONT><BR><A NAME="1195385"></A><FONT FACE="courier, couriernew, monospaced size" SIZE="2"><zcodeline>Packages.<I>className</I></zcodeline></FONT><P><A NAME="1197207"> </A><FONT FACE="Arial, Helvetica, sans-serif" SIZE="2"><zparagraph>where <FONT FACE="courier, couriernew, monospaced size"><I>classname</I></font> is the fully qualified name of a Java class.</zparagraph></FONT><P><BR><A NAME="1195394"> </A><A NAME="Description"> </A><FONT FACE="Arial, Helvetica, sans-serif" SIZE="2"><B><zrefheader>Description</zrefheader></B></FONT><BR><A NAME="1195361"> </A><FONT FACE="Arial, Helvetica, sans-serif" SIZE="2"><zparagraph>You must use the <FONT FACE="courier, couriernew, monospaced size"><I>className</I></font> property of the <FONT FACE="courier, couriernew, monospaced size">Packages</FONT> object to access classes outside the <FONT FACE="courier, couriernew, monospaced size">netscape</FONT>, <FONT FACE="courier, couriernew, monospaced size">sun</FONT>, and <FONT FACE="courier, couriernew, monospaced size">java</FONT> packages.</zparagraph></FONT>⌨️ 快捷键说明
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