");</script>String</a><br /></dd><dt><span class="parameter">clientmsgid</span> (Optional)</dt><dd>类型：<a href="https://docs.microsoft.com/dotnet/api/system.string" target="_blank">System<span id="LSTE3B51AA0_5"></span><script type="text/javascript">AddLanguageSpecificTextSet("LSTE3B51AA0_5?cs=.|vb=.|cpp=::|nu=.|fs=.");</script>String</a><br />开发者侧群发msgid，长度限制64字节，如不填，则后台默认以群发范围和群发内容的摘要值做为clientmsgid</dd><dt><span class="para