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<A NAME="1193429"> </A><FONT FACE="Arial, Helvetica, sans-serif" SIZE="2"><ztabletext><A HREF="array.html#1193137" >Array</A></ztabletext></FONT> </TD> </TR> <TR> <TD VALIGN=TOP COLSPAN=2 ROWSPAN=1><P><A NAME="1193431"> </A><FONT FACE="Arial, Helvetica, sans-serif" SIZE="2"><ztabletext><I>Static</I></ztabletext></FONT></TD> </TR> <TR> <TD VALIGN=TOP><P><A NAME="1193435"> </A><FONT FACE="Arial, Helvetica, sans-serif" SIZE="2"><ztabletext><I>Implemented in</I></ztabletext></FONT> </TD> <TD VALIGN=TOP><P><A NAME="1193437"> </A><FONT FACE="Arial, Helvetica, sans-serif" SIZE="2"><ztabletext>JavaScript 1.2, NES 3.0</ztabletext></FONT> </TD> </TR></TABLE><P></zparagraph></FONT><P><BR><P><A NAME="1195456"> </A><A NAME="join"> </A><FONT FACE="Arial, Helvetica, sans-serif" SIZE="4"><B><zrefhead2>join</zrefhead2></B></FONT><P><A NAME="1195470"> </A><FONT FACE="Arial, Helvetica, sans-serif" SIZE="2"><zparagraph>Joins all elements of an array into a string.<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="1195460"> </A><FONT FACE="Arial, Helvetica, sans-serif" SIZE="2"><ztabletext><I>Method of</I></ztabletext></FONT> </TD> <TD VALIGN=TOP><P><A NAME="1195465"> </A><FONT FACE="Arial, Helvetica, sans-serif" SIZE="2"><ztabletext><A HREF="array.html#1193137" >Array</A></ztabletext></FONT> </TD> </TR> <TR> <TD VALIGN=TOP><P><A NAME="1195467"> </A><FONT FACE="Arial, Helvetica, sans-serif" SIZE="2"><ztabletext><I>Implemented in</I></ztabletext></FONT> </TD> <TD VALIGN=TOP><P><A NAME="1195469"> </A><FONT FACE="Arial, Helvetica, sans-serif" SIZE="2"><ztabletext>JavaScript 1.1, NES 2.0</ztabletext></FONT> </TD> </TR> <TR> <TD VALIGN=TOP><P><A NAME="1198304"> </A><FONT FACE="Arial, Helvetica, sans-serif" SIZE="2"><ztabletext><I>ECMA version</I></ztabletext></FONT> </TD> <TD VALIGN=TOP><P><A NAME="1198306"> </A><FONT FACE="Arial, Helvetica, sans-serif" SIZE="2"><ztabletext>ECMA-262</ztabletext></FONT> </TD> </TR></TABLE><P></zparagraph></FONT><P><BR><A NAME="1195471"> </A><A NAME="Syntax"> </A><FONT FACE="Arial, Helvetica, sans-serif" SIZE="2"><B><zrefheader>Syntax</zrefheader></B></FONT><BR><A NAME="1195472"></A><FONT FACE="courier, couriernew, monospaced size" SIZE="2"><zcodeline>join(<I>separator</I>)</zcodeline></FONT><P><BR><A NAME="1195473"> </A><A NAME="Parameters"> </A><FONT FACE="Arial, Helvetica, sans-serif" SIZE="2"><B><zrefheader>Parameters</zrefheader></B></FONT><BR><A NAME="1195479"> </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> <TD VALIGN=TOP><A NAME="1195476"></A><FONT FACE="courier, couriernew, monospaced size" SIZE="2"><zcodeline>separator</zcodeline></FONT><P> </TD> <TD VALIGN=TOP><P><A NAME="1195478"> </A><FONT FACE="Arial, Helvetica, sans-serif" SIZE="2"><ztabletext>Specifies a string to separate each element of the array. The separator is converted to a string if necessary. If omitted, the array elements are separated with a comma.</ztabletext></FONT> </TD> </TR></TABLE><P></zparagraph></FONT><P><BR><A NAME="1195480"> </A><A NAME="Description"> </A><FONT FACE="Arial, Helvetica, sans-serif" SIZE="2"><B><zrefheader>Description</zrefheader></B></FONT><BR><A NAME="1195481"> </A><FONT FACE="Arial, Helvetica, sans-serif" SIZE="2"><zparagraph>The string conversions of all array elements are joined into one string.</zparagraph></FONT><P><BR><A NAME="1195482"> </A><A NAME="Examples"> </A><FONT FACE="Arial, Helvetica, sans-serif" SIZE="2"><B><zrefheader>Examples</zrefheader></B></FONT><BR><A NAME="1195483"> </A><FONT FACE="Arial, Helvetica, sans-serif" SIZE="2"><zparagraph>The following example creates an array, <FONT FACE="courier, couriernew, monospaced size">a</FONT>, with three elements, then joins the array three times: using the default separator, then a comma and a space, and then a plus.</zparagraph></FONT><P><A NAME="1206975"></A><FONT FACE="courier, couriernew, monospaced size" SIZE="2"><zcodeline>a = new Array("Wind","Rain","Fire")<br>myVar1=a.join() // assigns "Wind,Rain,Fire" to myVar1<br>myVar2=a.join(", ") // assigns "Wind, Rain, Fire" to myVar1<br>myVar3=a.join(" + ") // assigns "Wind + Rain + Fire" to myVar1</zcodeline></FONT><P><BR><A NAME="1195487"> </A><A NAME="See also"> </A><FONT FACE="Arial, Helvetica, sans-serif" SIZE="2"><B><zrefheader>See also</zrefheader></B></FONT><BR><A NAME="1195491"> </A><FONT FACE="Arial, Helvetica, sans-serif" SIZE="2"><zparagraph><A HREF="array.html#1193641" >Array.reverse</A></zparagraph></FONT><P><BR><P><A NAME="1193439"> </A><A NAME="length"> </A><FONT FACE="Arial, Helvetica, sans-serif" SIZE="4"><B><zrefhead2>length</zrefhead2></B></FONT><P><A NAME="1193454"> </A><FONT FACE="Arial, Helvetica, sans-serif" SIZE="2"><zparagraph>An unsigned, 32-bit integer that specifies the number of elements in an array.<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="1193443"> </A><FONT FACE="Arial, Helvetica, sans-serif" SIZE="2"><ztabletext><I>Property of</I></ztabletext></FONT> </TD> <TD VALIGN=TOP><P><A NAME="1193448"> </A><FONT FACE="Arial, Helvetica, sans-serif" SIZE="2"><ztabletext><A HREF="array.html#1193137" >Array</A></ztabletext></FONT> </TD> </TR> <TR> <TD VALIGN=TOP><P><A NAME="1193450"> </A><FONT FACE="Arial, Helvetica, sans-serif" SIZE="2"><ztabletext><I>Implemented in</I></ztabletext></FONT> </TD> <TD VALIGN=TOP><P><A NAME="1193452"> </A><FONT FACE="Arial, Helvetica, sans-serif" SIZE="2"><ztabletext>JavaScript 1.1, NES 2.0</ztabletext></FONT><P><A NAME="1198137"> </A><FONT FACE="Arial, Helvetica, sans-serif" SIZE="2"><ztabletext></ztabletext></FONT><P><A NAME="1193453"> </A><FONT FACE="Arial, Helvetica, sans-serif" SIZE="2"><ztabletext>JavaScript 1.3: <FONT FACE="courier, couriernew, monospaced size">length</FONT> is an unsigned, 32-bit integer with a value less than 2<SUP>32</SUP>.</ztabletext></FONT> </TD> </TR> <TR> <TD VALIGN=TOP><P><A NAME="1198337"> </A><FONT FACE="Arial, Helvetica, sans-serif" SIZE="2"><ztabletext><I>ECMA version</I></ztabletext></FONT> </TD> <TD VALIGN=TOP><P><A NAME="1198339"> </A><FONT FACE="Arial, Helvetica, sans-serif" SIZE="2"><ztabletext>ECMA-262</ztabletext></FONT> </TD> </TR></TABLE><P></zparagraph></FONT><P><BR><A NAME="1193455"> </A><A NAME="Description"> </A><FONT FACE="Arial, Helvetica, sans-serif" SIZE="2"><B><zrefheader>Description</zrefheader></B></FONT><BR><A NAME="1193456"> </A><FONT FACE="Arial, Helvetica, sans-serif" SIZE="2"><zparagraph>The value of the <FONT FACE="courier, couriernew, monospaced size">length</FONT> property is an integer with a positive sign and a value less than 2 to the 32 power (2<SUP>32</SUP>).</zparagraph></FONT><P><A NAME="1193457"> </A><FONT FACE="Arial, Helvetica, sans-serif" SIZE="2"><zparagraph>You can set the <FONT FACE="courier, couriernew, monospaced size">length</FONT> property to truncate an array at any time. When you extend an array by changing its <FONT FACE="courier, couriernew, monospaced size">length</FONT> property, the number of actual elements does not increase; for example, if you set <FONT FACE="courier, couriernew, monospaced size">length</FONT> to 3 when it is currently 2, the array still contains only 2 elements.</zparagraph></FONT><P><BR><A NAME="1193458"> </A><A NAME="Examples"> </A><FONT FACE="Arial, Helvetica, sans-serif" SIZE="2"><B><zrefheader>Examples</zrefheader></B></FONT><BR><A NAME="1213262"> </A><FONT FACE="Arial, Helvetica, sans-serif" SIZE="2"><zparagraph>In the following example, the <FONT FACE="courier, couriernew, monospaced size">getChoice</FONT> function uses the <FONT FACE="courier, couriernew, monospaced size">length</FONT> property to iterate over every element in the <FONT FACE="courier, couriernew, monospaced size">musicType</FONT> array. <FONT FACE="courier, couriernew, monospaced size">musicType</FONT> is a select element on the <FONT FACE="courier, couriernew, monospaced size">musicForm</FONT> form.</zparagraph></FONT><P><A NAME="1213264"></A><FONT FACE="courier, couriernew, monospaced size" SIZE="2"><zcodeline>function getChoice() {<br> for (var i = 0; i < document.musicForm.musicType.length; i++) {<br> if (document.musicForm.musicType.options[i].selected == true) {<br> return document.musicForm.musicType.options[i].text<br> }<br> }<br>}</zcodeline></FONT><P><A NAME="1193461"> </A><FONT FACE="Arial, Helvetica, sans-serif" SIZE="2"><zparagraph>The following example shortens the array <FONT FACE="courier, couriernew, monospaced size">statesUS</FONT> to a length of 50 if the current length is greater than 50.</zparagraph></FONT><P><A NAME="1193462"></A><FONT FACE="courier, couriernew, monospaced size" SIZE="2"><zcodeline>if (statesUS.length > 50) {<br> statesUS.length=50<br>}</zcodeline></FONT><P><BR><P><A NAME="1196003"> </A><A NAME="pop"> </A><FONT FACE="Arial, Helvetica, sans-serif" SIZE="4"><B><zrefhead2>pop</zrefhead2></B></FONT><P><A NAME="1196005"> </A><FONT FACE="Arial, Helvetica, sans-serif" SIZE="2"><zparagraph>Removes the last element from an array and returns that element. This method changes the length of the array.<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="1196008"> </A><FONT FACE="Arial, Helvetica, sans-serif" SIZE="2"><ztabletext><I>Method of</I></ztabletext></FONT> </TD> <TD VALIGN=TOP><P><A NAME="1196013"> </A><FONT FACE="Arial, Helvetica, sans-serif" SIZE="2"><ztabletext><A HREF="array.html#1193137" >Array</A></ztabletext></FONT> </TD> </TR> <TR> <TD VALIGN=TOP><P><A NAME="1196015"> </A><FONT FACE="Arial, Helvetica, sans-serif" SIZE="2"><ztabletext><I>Implemented in</I></ztabletext></FONT> </TD> <TD VALIGN=TOP><P><A NAME="1196017"> </A><FONT FACE="Arial, Helvetica, sans-serif" SIZE="2"><ztabletext>JavaScript 1.2, NES 3.0</ztabletext></FONT> </TD> </TR> <TR> <TD VALIGN=TOP><P><A NAME="1220475"> </A><FONT FACE="Arial, Helvetica, sans-serif" SIZE="2"><ztabletext><I>ECMA version</I></ztabletext></FONT> </TD> <TD VALIGN=TOP><P><A NAME="1220477"> </A><FONT FACE="Arial, Helvetica, sans-serif" SIZE="2"><ztabletext>ECMA-262 Edition 3</ztabletext></FONT> </TD> </TR></TABLE><P></zparagraph></FONT><P><BR><A NAME="1196018"> </A><A NAME="Syntax"> </A><FONT FACE="Arial, Helvetica, sans-serif" SIZE="2"><B><zrefheader>Syntax</zrefheader></B></FONT><BR><A NAME="1196019"></A><FONT FACE="courier, couriernew, monospaced size" SIZE="2"><zcodeline>pop()</zcodeline></FONT><P><BR><A NAME="1196020"> </A><A NAME="Parameters"> </A><FONT FACE="Arial, Helvetica, sans-serif" SIZE="2"><B><zrefheader>Parameters</zrefheader></B></FONT><BR><A NAME="1196021"> </A><FONT FACE="Arial, Helvetica, sans-serif" SIZE="2"><zparagraph>None. </zparagraph></FONT><P><BR><A NAME="1196022"> </A><A NAME="Example"> </A>?? 快捷鍵說(shuō)明
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