在此按钮中添加id:<input class="submit" style="display: inline;" name="action" type="submit" value="计算" id="calculate" />在此span中添加id:<span style="font-size: 18px;" id="calculateResult">然后使用jQuery:$( "#calculate" ).click(function() { var amount= $('#amount55').find(":selected").text(); var measurement= $('#measurement55').find(":selected").text(); $('#calculateResult').html("你需要:" amount*measurement);});