📄 vbs147.htm

📁 VBScript 是一种脚本语言
💻 HTM
字号:
<!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML//EN"><HTML>
<HEAD><TITLE>Left Function</TITLE> 
<META HTTP-EQUIV="Content-Type" CONTENT="text/html; charset=iso8859-1">
<META NAME="MS.LOCALE" CONTENT="EN-US">
<META NAME="PRODUCT" CONTENT="Visual Basic Scripting Edition">
<META NAME="TECHNOLOGY" CONTENT="SCRIPTING">
<META NAME="CATEGORY" CONTENT="Language Reference">

<META NAME="Keywords" CONTENT="Left function,LeftB function,leftmost characters,strings substrings,characters leftmost,returning substrings,substrings returning,strings within strings,strings leftmost characters,strings,characters,substrings"><META NAME="Description" CONTENT="Left Function"></HEAD>
<BODY BGCOLOR=FFFFFF LINK=#0033CC>
<!--TOOLBAR_START-->
<!--TOOLBAR_EXEMPT-->
<!--TOOLBAR_END-->
<FONT FACE="Verdana, Arial, Helvetica" SIZE=2>
<TABLE BORDER=0 CELLPADDING=0 CELLSPACING=0 WIDTH=100%><TR VALIGN=TOP><TD WIDTH=360>
<FONT SIZE=1 COLOR=#660033>Microsoft&#174; Visual Basic&#174; Scripting Edition</FONT><BR>
<FONT SIZE=5 COLOR=#660033><B>Left Function</B></FONT>

</TD>
<TD ALIGN=RIGHT>
<FONT SIZE=2>&nbsp;<A HREF="vbstoc.htm">Language&nbsp;Reference</A>&nbsp;<BR>
<A HREF="vbs16.htm">Version&nbsp;1</A>&nbsp;<P></FONT>
</TD></TR>
</TABLE> 
<FONT SIZE=2><P>
<A HREF="vbs148.htm">See Also</A></FONT>
<HR NOSHADE SIZE=1>

<H5>Description</H5>
<BLOCKQUOTE>Returns a specified number of characters from the left side of a string.</BLOCKQUOTE>

<H5>Syntax</H5>
<BLOCKQUOTE><b>Left(</b><i>string</i><b>, </b><i>length</i><b>)</b><P>
The <b>Left</b> function syntax has these arguments:<P>

<TABLE WIDTH=87% BORDER=1 CELLPADDING=5 CELLSPACING=0>
<TR VALIGN=TOP BGCOLOR="#DDDDDD">
<TD><FONT SIZE=2><b>Part</b></FONT></TD>
<TD><FONT SIZE=2><b>Description</b></FONT></TD></TR>
<TR VALIGN=TOP>
<TD><FONT SIZE=2><i>string</i></FONT></TD>
<TD><FONT SIZE=2>
<A HREF="vbs0.htm#defStringExpression">String expression</A> from which the leftmost characters are returned. If <i>string</i> contains 
<A HREF="vbs0.htm#defNull"><B>Null</B></A>, <b>Null</b> is returned.</FONT></TD></TR>
<TR VALIGN=TOP>
<TD><FONT SIZE=2><i>length</i></FONT></TD>
<TD><FONT SIZE=2>
<A HREF="vbs0.htm#defNumericExpression">Numeric expression</A> indicating how many characters to return. If 0, a zero-length string(&quot;&quot;) is returned. If greater than or equal to the number of characters in <i>string</i>, the entire string is returned.</FONT></TD></TR></TABLE>
</BLOCKQUOTE>

<H5>Remarks</H5>
<BLOCKQUOTE>To determine the number of characters in <i>string</i>, use the <b>Len</b> function.

<TABLE CELLSPACING=0 CELLPADDING=0 BORDER=0 WIDTH=87%>
<TR><TD COLSPAN=2 VALIGN=BOTTOM><HR NOSHADE SIze=1></TD></TR><TR>
<TD VALIGN=TOP><FONT SIZE=2><b>Note</b>&nbsp;&nbsp;The <b>LeftB</b> function is used with byte data contained in a string. Instead of specifying the number of characters to return, <i>length</i> specifies the number of bytes.</FONT></TD></TR>
<TR><TD COLSPAN=2 VALIGN=TOP><HR NOSHADE SIZE=1></TD></TR></TABLE>
</BLOCKQUOTE>

<hr noshade size=1>
<p align=center><em><a href="../../common/colegal.htm">&copy; 1997 by Microsoft Corporation. All rights reserved.</a></em></p> 


</FONT></BODY></HTML>
⌨️ 快捷键说明

复制代码 Ctrl + C
搜索代码 Ctrl + F
全屏模式 F11
切换主题 Ctrl + Shift + D
显示快捷键 ?
增大字号 Ctrl + =
减小字号 Ctrl + -