尝试一下:

    if (driver instanceof JavascriptExecutor) {
            System.out.println("In try");
            ((JavascriptExecutor)driver).executeScript("document.getElementById('comment').value=\'" + line1 + line2 + "\';");
    } else {
            throw new IllegalStateException("This driver does not support JavaScript!");
    }

要将字符串元素传递给脚本字符串，您需要在单引号前放置\.希望这会有所帮助.

To pass a string element to your script String, You need to put \ before the single quotes. Hope this helps.