换个名字就OK？

function sendMessage(){             return false;}<form:form id="searchForm" modelAttribute="" action="" method="post" class="breadcrumb form-search ">        <ul class="ul-form">            <li class="btns"><input id="send" class="btn btn-primary" type="button" value="发送" onclick="return sendMessage();"/></li>            <li class="clearfix"></li>        </ul></form:form>

刚开始用send作为函数名，报send() is not a function