string.html

javascript 1.5规范

<zcodeline>var worldString="Hello, world"
</zcodeline>
</FONT>
<P><A NAME="1196530"></A><FONT FACE="courier, couriernew, monospaced size" SIZE="2">
<zcodeline>document.write(worldString.blink())<br>
document.write("&lt;P&gt;" + worldString.bold())<br>
document.write("&lt;P&gt;" + worldString.italics())<br>
document.write("&lt;P&gt;" + worldString.strike())
</zcodeline>
</FONT>
<P>
<A NAME="1196531"> </A><FONT FACE="Arial, Helvetica, sans-serif" SIZE="2"><zparagraph>The previous example produces the same output as the following HTML:</zparagraph>
</FONT>
<P>
<A NAME="1196532"></A><FONT FACE="courier, couriernew, monospaced size" SIZE="2">
<zcodeline>&lt;BLINK&gt;Hello, world&lt;/BLINK&gt;<br>
&lt;P&gt;&lt;B&gt;Hello, world&lt;/B&gt;<br>
&lt;P&gt;&lt;I&gt;Hello, world&lt;/I&gt;<br>
&lt;P&gt;&lt;STRIKE&gt;Hello, world&lt;/STRIKE&gt;
</zcodeline>
</FONT>
<P><BR>
<A NAME="1196533"> </A>
<A NAME="See also"> </A>
<FONT FACE="Arial, Helvetica, sans-serif" SIZE="2">
<B>
<zrefheader>See also</zrefheader>
</B>
</FONT>
<BR>

<A NAME="1196543"> </A><FONT FACE="Arial, Helvetica, sans-serif" SIZE="2"><zparagraph><A HREF="string.html#1196546"  >String.bold</A>, <A HREF="string.html#1196955"  >String.italics</A>, <A HREF="string.html#1194525"  >String.strike</A> </zparagraph>
</FONT>
<P>
<BR>
<P>
<A NAME="1196546"> </A>
<A NAME="bold"> </A>
<FONT FACE="Arial, Helvetica, sans-serif" SIZE="4">
<B>
<zrefhead2>bold</zrefhead2>
</B>
</FONT>
<P>

<A NAME="1196562"> </A><FONT FACE="Arial, Helvetica, sans-serif" SIZE="2"><zparagraph>Causes a string to be displayed as bold as if it were in a<FONT FACE="courier, couriernew, monospaced size"> B</FONT> tag.<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="1196552"> </A>
<FONT FACE="Arial, Helvetica, sans-serif" SIZE="2">
<ztabletext><I>Method of</I></ztabletext>
</FONT>&nbsp;</TD>
    <TD VALIGN=TOP>
<P>
<A NAME="1196557"> </A>
<FONT FACE="Arial, Helvetica, sans-serif" SIZE="2">
<ztabletext><A HREF="string.html#1193137"  >String</A></ztabletext>
</FONT>&nbsp;</TD>
  </TR>
  <TR>
    <TD VALIGN=TOP>
<P>
<A NAME="1196559"> </A>
<FONT FACE="Arial, Helvetica, sans-serif" SIZE="2">
<ztabletext><I>Implemented in</I></ztabletext>
</FONT>&nbsp;</TD>
    <TD VALIGN=TOP>
<P>
<A NAME="1196561"> </A>
<FONT FACE="Arial, Helvetica, sans-serif" SIZE="2">
<ztabletext>JavaScript 1.0, NES 2.0</ztabletext>
</FONT>&nbsp;</TD>
  </TR>
</TABLE>



<P></zparagraph>
</FONT>
<P>
<BR>
<A NAME="1196563"> </A>
<A NAME="Syntax"> </A>
<FONT FACE="Arial, Helvetica, sans-serif" SIZE="2">
<B>
<zrefheader>Syntax</zrefheader>
</B>
</FONT>
<BR>
<A NAME="1196564"></A><FONT FACE="courier, couriernew, monospaced size" SIZE="2">
<zcodeline>bold()
</zcodeline>
</FONT>
<P><BR>
<A NAME="1196565"> </A>
<A NAME="Parameters"> </A>
<FONT FACE="Arial, Helvetica, sans-serif" SIZE="2">
<B>
<zrefheader>Parameters</zrefheader>
</B>
</FONT>
<BR>

<A NAME="1196566"> </A><FONT FACE="Arial, Helvetica, sans-serif" SIZE="2"><zparagraph>None</zparagraph>
</FONT>
<P>
<BR>
<A NAME="1196567"> </A>
<A NAME="Description"> </A>
<FONT FACE="Arial, Helvetica, sans-serif" SIZE="2">
<B>
<zrefheader>Description</zrefheader>
</B>
</FONT>
<BR>

<A NAME="1196574"> </A><FONT FACE="Arial, Helvetica, sans-serif" SIZE="2"><zparagraph>Use the <FONT FACE="courier, couriernew, monospaced size">bold</FONT> method with the <FONT FACE="courier, couriernew, monospaced size">write</FONT> or <FONT FACE="courier, couriernew, monospaced size">writeln</FONT> methods to format and display a string in a document. In server-side JavaScript, use the <FONT FACE="courier, couriernew, monospaced size">write</FONT> function to display the string.</zparagraph>
</FONT>
<P>
<BR>
<A NAME="1196578"> </A>
<A NAME="Examples"> </A>
<FONT FACE="Arial, Helvetica, sans-serif" SIZE="2">
<B>
<zrefheader>Examples</zrefheader>
</B>
</FONT>
<BR>

<A NAME="1196579"> </A><FONT FACE="Arial, Helvetica, sans-serif" SIZE="2"><zparagraph>The following example uses <FONT FACE="courier, couriernew, monospaced size">string</FONT> methods to change the formatting of a string:</zparagraph>
</FONT>
<P>
<A NAME="1196580"></A><FONT FACE="courier, couriernew, monospaced size" SIZE="2">
<zcodeline>var worldString="Hello, world" <br>
document.write(worldString.blink())<br>
document.write("&lt;P&gt;" + worldString.bold())<br>
document.write("&lt;P&gt;" + worldString.italics())<br>
document.write("&lt;P&gt;" + worldString.strike())
</zcodeline>
</FONT>
<P>
<A NAME="1196581"> </A><FONT FACE="Arial, Helvetica, sans-serif" SIZE="2"><zparagraph>The previous example produces the same output as the following HTML:</zparagraph>
</FONT>
<P>
<A NAME="1196582"></A><FONT FACE="courier, couriernew, monospaced size" SIZE="2">
<zcodeline>&lt;BLINK&gt;Hello, world&lt;/BLINK&gt;<br>
&lt;P&gt;&lt;B&gt;Hello, world&lt;/B&gt;<br>
&lt;P&gt;&lt;I&gt;Hello, world&lt;/I&gt;<br>
&lt;P&gt;&lt;STRIKE&gt;Hello, world&lt;/STRIKE&gt;
</zcodeline>
</FONT>
<P><BR>
<A NAME="1196583"> </A>
<A NAME="See also"> </A>
<FONT FACE="Arial, Helvetica, sans-serif" SIZE="2">
<B>
<zrefheader>See also</zrefheader>
</B>
</FONT>
<BR>

<A NAME="1196593"> </A><FONT FACE="Arial, Helvetica, sans-serif" SIZE="2"><zparagraph><A HREF="string.html#1196495"  >String.blink</A>, <A HREF="string.html#1196955"  >String.italics</A>, <A HREF="string.html#1194525"  >String.strike</A> </zparagraph>
</FONT>
<P>
<BR>
<P>
<A NAME="1196596"> </A>
<A NAME="charAt"> </A>
<FONT FACE="Arial, Helvetica, sans-serif" SIZE="4">
<B>
<zrefhead2>charAt</zrefhead2>
</B>
</FONT>
<P>

<A NAME="1196610"> </A><FONT FACE="Arial, Helvetica, sans-serif" SIZE="2"><zparagraph>Returns the specified character from the 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="1196600"> </A>
<FONT FACE="Arial, Helvetica, sans-serif" SIZE="2">
<ztabletext><I>Method of</I></ztabletext>
</FONT>&nbsp;</TD>
    <TD VALIGN=TOP>
<P>
<A NAME="1196605"> </A>
<FONT FACE="Arial, Helvetica, sans-serif" SIZE="2">
<ztabletext><A HREF="string.html#1193137"  >String</A></ztabletext>
</FONT>&nbsp;</TD>
  </TR>
  <TR>
    <TD VALIGN=TOP>
<P>
<A NAME="1196607"> </A>
<FONT FACE="Arial, Helvetica, sans-serif" SIZE="2">
<ztabletext><I>Implemented in</I></ztabletext>
</FONT>&nbsp;</TD>
    <TD VALIGN=TOP>
<P>
<A NAME="1196609"> </A>
<FONT FACE="Arial, Helvetica, sans-serif" SIZE="2">
<ztabletext>JavaScript 1.0, NES 2.0</ztabletext>
</FONT>&nbsp;</TD>
  </TR>
  <TR>
    <TD VALIGN=TOP>
<P>
<A NAME="1203206"> </A>
<FONT FACE="Arial, Helvetica, sans-serif" SIZE="2">
<ztabletext><I>ECMA version</I></ztabletext>
</FONT>&nbsp;</TD>
    <TD VALIGN=TOP>
<P>
<A NAME="1203208"> </A>
<FONT FACE="Arial, Helvetica, sans-serif" SIZE="2">
<ztabletext>ECMA-262</ztabletext>
</FONT>&nbsp;</TD>
  </TR>
</TABLE>



<P></zparagraph>
</FONT>
<P>
<BR>
<A NAME="1196611"> </A>
<A NAME="Syntax"> </A>
<FONT FACE="Arial, Helvetica, sans-serif" SIZE="2">
<B>
<zrefheader>Syntax</zrefheader>
</B>
</FONT>
<BR>
<A NAME="1196612"></A><FONT FACE="courier, couriernew, monospaced size" SIZE="2">
<zcodeline>charAt(<I>index</I>)
</zcodeline>
</FONT>
<P><BR>
<A NAME="1196613"> </A>
<A NAME="Parameters"> </A>
<FONT FACE="Arial, Helvetica, sans-serif" SIZE="2">
<B>
<zrefheader>Parameters</zrefheader>
</B>
</FONT>
<BR>

<A NAME="1196619"> </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="1196616"></A><FONT FACE="courier, couriernew, monospaced size" SIZE="2">
<zcodeline>index
</zcodeline>
</FONT>
<P>&nbsp;</TD>
    <TD VALIGN=TOP>
<P>
<A NAME="1196618"> </A>
<FONT FACE="Arial, Helvetica, sans-serif" SIZE="2">
<ztabletext>An integer between 0 and 1 less than the length of the string. </ztabletext>
</FONT>&nbsp;</TD>
  </TR>
</TABLE>



<P></zparagraph>
</FONT>
<P>
<BR>
<A NAME="1196620"> </A>
<A NAME="Description"> </A>
<FONT FACE="Arial, Helvetica, sans-serif" SIZE="2">
<B>
<zrefheader>Description</zrefheader>
</B>
</FONT>
<BR>

<A NAME="1196621"> </A><FONT FACE="Arial, Helvetica, sans-serif" SIZE="2"><zparagraph>Characters in a string are indexed from left to right. The index of the first character is 0, and the index of the last character in a string called <FONT FACE="courier, couriernew, monospaced size">stringName</FONT> is <FONT FACE="courier, couriernew, monospaced size">stringName.length - 1</FONT>. If the <FONT FACE="courier, couriernew, monospaced size">index</FONT> you supply is out of range, JavaScript returns an empty string.</zparagraph>
</FONT>
<P>
<BR>
<A NAME="1196622"> </A>
<A NAME="Examples"> </A>
<FONT FACE="Arial, Helvetica, sans-serif" SIZE="2">
<B>
<zrefheader>Examples</zrefheader>
</B>
</FONT>
<BR>

<A NAME="1196623"> </A><FONT FACE="Arial, Helvetica, sans-serif" SIZE="2"><zparagraph>The following example displays characters at different locations in the string <FONT FACE="courier, couriernew, monospaced size">"Brave new world"</FONT>:</zparagraph>
</FONT>
<P>
<A NAME="1196624"></A><FONT FACE="courier, couriernew, monospaced size" SIZE="2">
<zcodeline>var anyString="Brave new world"
</zcodeline>
</FONT>
<P><A NAME="1196625"></A><FONT FACE="courier, couriernew, monospaced size" SIZE="2">
<zcodeline>document.writeln("The character at index 0 is " + anyString.charAt(0))<br>
document.writeln("The character at index 1 is " + anyString.charAt(1))<br>
document.writeln("The character at index 2 is " + anyString.charAt(2))<br>
document.writeln("The character at index 3 is " + anyString.charAt(3))<br>
document.writeln("The character at index 4 is " + anyString.charAt(4))
</zcodeline>
</FONT>
<P>
<A NAME="1196626"> </A><FONT FACE="Arial, Helvetica, sans-serif" SIZE="2"><zparagraph>These lines display the following:</zparagraph>
</FONT>
<P>

<A NAME="1196627"> </A><FONT FACE="Arial, Helvetica, sans-serif" SIZE="2"><zparagraph>The character at index 0 is B<br>The character at index 1 is r<br>The character at index 2 is a<br>The character at index 3 is v<br>The character at index 4 is e</zparagraph>
</FONT>
<P>
<BR>
<A NAME="1196635"> </A>
<A NAME="See also"> </A>
<FONT FACE="Arial, Helvetica, sans-serif" SIZE="2">
<B>
<zrefheader>See also</zrefheader>
</B>
</FONT>
<BR>

<A NAME="1196645"> </A><FONT FACE="Arial, Helvetica, sans-serif" SIZE="2"><zparagraph><A HREF="string.html#1196895"  >String.indexOf</A>, <A HREF="string.html#1197005"  >String.lastIndexOf</A>, <A HREF="string.html#1194452"  >String.split</A> </zparagraph>
</FONT>
<P>
<BR>
<P>
<A NAME="1196647"> </A>
<A NAME="charCodeAt"> </A>
<FONT FACE="Arial, Helvetica, sans-serif" SIZE="4">
<B>
<zrefhead2>charCodeAt</zrefhead2>
</B>
</FONT>
<P>

<A NAME="1196648"> </A><FONT FACE="Arial, Helvetica, sans-serif" SIZE="2"><zparagraph>Returns a number indicating the Unicode value of the character at the given index. <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="1196651"> </A>
<FONT FACE="Arial, Helvetica, sans-serif" SIZE="2">
<ztabletext><I>Method of</I></ztabletext>
</FONT>&nbsp;</TD>
    <TD VALIGN=TOP>
<P>
<A NAME="1196656"> </A>
<FONT FACE="Arial, Helvetica, sans-serif" SIZE="2">
<ztabletext><A HREF="string.html#1193137"  >String</A></ztabletext>
</FONT>&nbsp;</TD>
  </TR>
  <TR>
    <TD VALIGN=TOP>
<P>
<A NAME="1196658"> </A>
<FONT FACE="Arial, Helvetica, sans-serif" SIZE="2">
<ztabletext><I>Implemented in</I></ztabletext>
</FONT>&nbsp;</TD>
    <TD VALIGN=TOP>
<P>
<A NAME="1196660"> </A>
<FONT FACE="Arial, Helvetica, sans-serif" SIZE="2">
<ztabletext>JavaScript 1.2, NES 3.0</ztabletext>
</FONT>
<P>
<A NAME="1223347"> </A>
<FONT FACE="Arial, Helvetica, sans-serif" SIZE="2">
<ztabletext></ztabletext>
</FONT>
<P>
<A NAME="1223334"> </A>
<FONT FACE="Arial, Helvetica, sans-serif" SIZE="2">
<ztabletext>JavaScript 1.3: returns a Unicode value rather than an ISO-Latin-1 value.</ztabletext>
</FONT>&nbsp;</TD>
  </TR>
  <TR>
    <TD VALIGN=TOP>
<P>
<A NAME="1203223"> </A>
<FONT FACE="Arial, Helvetica, sans-serif" SIZE="2">
<ztabletext><I>ECMA version</I></ztabletext>
</FONT>&nbsp;</TD>
    <TD VALIGN=TOP>
<P>
<A NAME="1203225"> </A>
<FONT FACE="Arial, Helvetica, sans-serif" SIZE="2">
<ztabletext>ECMA-262</ztabletext>