我正在嘗試單擊以下HTML中的最后一個跨度元素<div class="rating rating-set js-ratingCalcSet" >  <div class="rating-stars js-writeReviewStars">     <span class="js-ratingIcon glyphicon glyphicon-star fh"></span>    <span class="js-ratingIcon glyphicon glyphicon-star lh"></span>     ...    <span class="js-ratingIcon glyphicon glyphicon-star fh"></span>    <span class="js-ratingIcon glyphicon glyphicon-star lh"></span>  </div></div>在Java中使用硒，具有以下代碼：driver.findElement(By.xpath("(//div[contains(@class, 'js-writeReviewStars')]//span)[last()]")).click(); 這將返回一個異常：org.openqa.selenium.InvalidSelectorException: invalid selector: Unable to locate an element with the xpath expression (//div[contains(@class, 'js-writeReviewStars')]//span)[last()] because of the following error:SyntaxError: Unexpected token }  ...*** Element info: {Using=xpath, value=(//div[contains(@class, 'js-writeReviewStars')]//span)[last()]}我已經(jīng)檢查了xpath表達(dá)式的有效性，它似乎是正確的（使用 https://www.freeformatter.com/xpath-tester.html），因?yàn)樗业搅四繕?biāo)元素。我嘗試過用括號將整個表達(dá)式括起來，但這不起作用。