[Selenium] 针对下拉菜单出现之后又立马消失的问题，通过Javascript改变元素的可见属性

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public void clickDateDropDownButton() {         SeleniumUtil.jsClick(driver, page.getDateDropdownButtonOfInvPolicyDialog());         WebElement dropDown = page.getDropdownListOfDateInInvPolicyDialog();                   String oldStyle =dropDown.getAttribute("style");         logger.info("The old style is : " + oldStyle);                   String newStyle="";         if(oldStyle.contains("display")){             newStyle = oldStyle.split("display")[0];         }         else{             newStyle = oldStyle+" display: none;";         }                   String javaScript = "return jQuery(arguments[0]).attr('style','"+newStyle+"');";         ((JavascriptExecutor) driver).executeScript(javaScript, dropDown);                   logger.info("The new style is : " + newStyle);     }