📄 vbs13.htm
字号:
<HTML>
<HEAD>
<TITLE>VBScript Operators</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="Tutorial">
<META NAME="Description" CONTENT="VBScript Operators">
</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=1COLOR=#660033>Microsoft® Visual Basic® Scripting Edition</FONT><BR>
<FONT SIZE=5 COLOR=#660033><B>VBScript Operators</B></FONT>
</TD>
<TD ALIGN=RIGHT>
<FONT SIZE=2> <A HREF="vbstutor.htm">VBScript Tutorial</A> <BR> <A HREF="vbs5.htm">Previous</A> | <A HREF="vbs4.htm">Next</A> <P></FONT>
</TD></TR>
</TABLE>
<BR><HR NOSHADE SIZE=1>
<BLOCKQUOTE>
VBScript has a full range of operators, including <A HREF="vbs235.htm">arithmetic operators</A>, <A HREF="vbs224.htm">comparison operators</A>, <A HREF="vbs237.htm">concatenation operators</A>, and <A HREF="vbs240.htm">logical operators</A>. </BLOCKQUOTE>
<H5>Operator Precedence</H5>
<BLOCKQUOTE>When several operations occur in an expression, each part is evaluated and resolved in a predetermined order called operator precedence. You can use parentheses to override the order of precedence and force some parts of an expression to be evaluated before others. Operations within parentheses are always performed before those outside. Within parentheses, however, standard operator precedence is maintained. <P>
When expressions contain operators from more than one category, arithmetic operators are evaluated first, comparison operators are evaluated next, and logical operators are evaluated last. Comparison operators all have equal precedence; that is, they are evaluated in the left-to-right order in which they appear. Arithmetic and logical operators are evaluated in the following order of precedence.<P>
<TABLE WIDTH=87% BORDER=1 CELLPADDING=5 CELLSPACING=0>
<TR BGCOLOR=#DDDDDD VALIGN=TOP ALIGN=CENTER>
<TD COLSPAN=2><FONT SIZE=2><B>Arithmetic</B></FONT></TD>
<TD COLSPAN=2><FONT SIZE=2><B>Comparison</B></FONT></TD>
<TD COLSPAN=2 ><FONT SIZE=2><B>Logical</B></TD></FONT></TR>
<TR BGCOLOR=#DDDDDD VALIGN=TOP>
<TD><FONT SIZE=2><B>Description</B></FONT></TD>
<TD ALIGN=CENTER><FONT SIZE=2><B>Symbol</B></FONT></TD>
<TD><FONT SIZE=2><B>Description</B></FONT></TD>
<TD ALIGN=CENTER><FONT SIZE=2><B>Symbol</B></FONT></TD>
<TD><FONT SIZE=2><B>Description</B></FONT></TD>
<TD ALIGN=CENTER><FONT SIZE=2><B>Symbol</B></FONT></TD></TR>
<TR VALIGN=TOP>
<TD><FONT SIZE=2><A HREF="vbs428.htm">Exponentiation</A></FONT></TD>
<TD ALIGN=CENTER><FONT SIZE=2>^</FONT></TD>
<TD><FONT SIZE=2><A HREF="vbs224.htm">Equality</A></FONT></TD>
<TD ALIGN=CENTER><FONT SIZE=2>=</FONT></TD>
<TD><FONT SIZE=2><A HREF="vbs440.htm">Logical negation</A></FONT></TD>
<TD ALIGN=CENTER><FONT SIZE=2>Not</FONT></TD></TR>
<TR VALIGN=TOP>
<TD><FONT SIZE=2><A HREF="vbs444.htm">Unary negation</A></FONT></TD>
<TD ALIGN=CENTER><FONT SIZE=2>-</FONT></TD>
<TD><FONT SIZE=2><A HREF="vbs224.htm">Inequality</A></FONT></TD>
<TD ALIGN=CENTER><FONT SIZE=2><></FONT></TD>
<TD><FONT SIZE=2><A HREF="vbs418.htm">Logical conjunction</A></FONT></TD>
<TD ALIGN=CENTER><FONT SIZE=2>And</FONT></TD></TR>
<TR VALIGN=TOP>
<TD><FONT SIZE=2><A HREF="vbs438.htm">Multiplication</A></FONT></TD>
<TD ALIGN=CENTER><FONT SIZE=2>*</FONT></TD>
<TD><FONT SIZE=2><A HREF="vbs224.htm">Less than</A></FONT></TD>
<TD ALIGN=CENTER><FONT SIZE=2><</FONT></TD>
<TD><FONT SIZE=2><A HREF="vbs442.htm">Logical disjunction</A></FONT></TD>
<TD ALIGN=CENTER><FONT SIZE=2>Or</FONT></TD></TR>
<TR VALIGN=TOP>
<TD><FONT SIZE=2><A HREF="vbs424.htm">Division</A></FONT></TD>
<TD ALIGN=CENTER><FONT SIZE=2>/</FONT></TD>
<TD><FONT SIZE=2><A HREF="vbs224.htm">Greater than</A></FONT></TD>
<TD ALIGN=CENTER><FONT SIZE=2>></FONT></TD>
<TD><FONT SIZE=2><A HREF="vbs446.htm">Logical exclusion</A></FONT></TD>
<TD ALIGN=CENTER><FONT SIZE=2>Xor</FONT></TD></TR>
<TR VALIGN=TOP>
<TD><FONT SIZE=2><A HREF="vbs432.htm">Integer division</A></FONT></TD>
<TD ALIGN=CENTER><FONT SIZE=2>\</FONT></TD>
<TD><FONT SIZE=2><A HREF="vbs224.htm">Less than or equal to</A></FONT></TD>
<TD ALIGN=CENTER><FONT SIZE=2><=</FONT></TD>
<TD><FONT SIZE=2><A HREF="vbs426.htm">Logical equivalence</A></FONT></TD>
<TD ALIGN=CENTER><FONT SIZE=2>Eqv</FONT></TD></TR>
<TR VALIGN=TOP>
<TD><FONT SIZE=2><A HREF="vbs436.htm">Modulus arithmetic</A></FONT></TD>
<TD ALIGN=CENTER><FONT SIZE=2>Mod</FONT></TD>
<TD><FONT SIZE=2><A HREF="vbs224.htm">Greater than or equal to</A></FONT></TD>
<TD ALIGN=CENTER><FONT SIZE=2>>=</FONT></TD>
<TD><FONT SIZE=2><A HREF="vbs430.htm">Logical implication</A></FONT></TD>
<TD ALIGN=CENTER><FONT SIZE=2>Imp</FONT></TD></TR>
<TR VALIGN=TOP>
<TD><FONT SIZE=2><A HREF="vbs416.htm">Addition</A></FONT></TD>
<TD ALIGN=CENTER><FONT SIZE=2>+</FONT></TD>
<TD><FONT SIZE=2><A HREF="vbs434.htm">Object equivalence</A></FONT></TD>
<TD ALIGN=CENTER><FONT SIZE=2>Is</FONT></TD>
<TD><FONT SIZE=2>  </FONT></TD>
<TD ALIGN=CENTER><FONT SIZE=2>  </FONT></TD></TR>
<TR VALIGN=TOP>
<TD><FONT SIZE=2><A HREF="vbs444.htm">Subtraction</A></FONT></TD>
<TD ALIGN=CENTER><FONT SIZE=2>-</FONT></TD>
<TD><FONT SIZE=2>  </FONT></TD>
<TD ALIGN=CENTER><FONT SIZE=2>  </FONT></TD>
<TD><FONT SIZE=2>  </FONT></TD>
<TD ALIGN=CENTER><FONT SIZE=2>  </TD></FONT></TR>
<TR VALIGN=TOP>
<TD><FONT SIZE=2><A HREF="vbs422.htm">String concatenation</A></FONT></TD>
<TD ALIGN=CENTER><FONT SIZE=2>&</FONT></TD>
<TD><FONT SIZE=2>  </FONT></TD>
<TD ALIGN=CENTER><FONT SIZE=2>  </FONT></TD>
<TD><FONT SIZE=2>  </FONT></TD>
<TD ALIGN=CENTER><FONT SIZE=2>  </FONT></TD></TR>
</TABLE>
<FONT SIZE=2>
When multiplication and division occur together in an expression, each operation is evaluated as it occurs from left to right. Likewise, when addition and subtraction occur together in an expression, each operation is evaluated in order of appearance from left to right.<P>
The string concatenation (&) operator is not an arithmetic operator, but in precedence it does fall after all arithmetic operators and before all comparison operators. The <B>Is</B> operator is an object reference comparison operator. It does not compare objects or their values; it checks only to determine if two object references refer to the same object.
</BLOCKQUOTE>
<hr noshade size=1>
<p align=center><em><a href="../../common/colegal.htm">© 1997 by Microsoft Corporation. All rights reserved.</a></em></p>
</FONT></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 + -