怎么能获取回车输入啊？
怎么能获取回车输入啊？ <TABLE cellSpacing=0 borderColorDark=#000000 cellPadding=5 borderColorLight=#ffffff border=1><CAPTION></CAPTION>
<TBODY>
<TR bgColor=#cccccc>
<TH colSpan=2><A name=390468></A>
<DIV class=TableTitle>Return values for user-input functions </DIV></TH></TR>
<TR bgColor=#cccccc>
<TH><A name=390472></A>
<DIV class=CellHeading>Code</DIV></TH>
<TH><A name=390474></A>
<DIV class=CellHeading>Description</DIV></TH></TR>
<TR>
<TD><A name=390542></A>
<DIV class=CellBody>RTNORM </DIV></TD>
<TD><A name=390544></A>
<DIV class=CellBody>User entered a valid value</DIV></TD></TR>
<TR>
<TD><A name=390546></A>
<DIV class=CellBody>RTERROR </DIV></TD>
<TD><A name=390548></A>
<DIV class=CellBody>The function call failed</DIV></TD></TR>
<TR>
<TD><A name=390550></A>
<DIV class=CellBody>RTCAN </DIV></TD>
<TD><A name=390552></A>
<DIV class=CellBody>User entered ESC</DIV></TD></TR>
<TR>
<TD><A name=390554></A>
<DIV class=CellBody>RTNONE </DIV></TD>
<TD><A name=390556></A>
<DIV class=CellBody>User entered only ENTER</DIV></TD></TR>
<TR>
<TD><A name=390558></A>
<DIV class=CellBody>RTREJ </DIV></TD>
<TD><A name=390560></A>
<DIV class=CellBody>AutoCAD rejected the request as invalid</DIV></TD></TR>
<TR>
<TD><A name=390562></A>
<DIV class=CellBody>RTKWORD </DIV></TD>
<TD><A name=390564></A>
<DIV class=CellBody>User entered a keyword or arbitrary text</DIV></TD></TR></TBODY></TABLE>
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