小编ita*_*tai的帖子

假设我有以下功能：

window.smoothScroll = function(target) {
  var scrollContainer = target;
  scrollContainer.scrollIntoView(true);
}

如何使页面滚动到元素上方 20px，而不是滚动到元素本身？

谢谢

假设我有这些字符串:

string1= "Queen -Bohemian Rhapsody"

string2= "Queen-Bohemian Rhapsody"

string3= "Queen- Bohemian Rhapsody"

我希望他们所有人都变成这样:

   string1= "Queen - Bohemian Rhapsody"
   string2= "Queen - Bohemian Rhapsody"
   string3= "Queen - Bohemian Rhapsody"

我怎么能用Python做到这一点？

谢谢!

我正在尝试使用正则表达式检查 PHP 中的用户输入有效性，但我无法弄清楚是什么。我的正则表达式有问题

这是我的if声明：

if(is_numeric($_SESSION['l-teacher'])&&preg_match('/^[A-Za-z0-9\u0590-\u05ff\*\-\.\, ]+$/',$_POST['content'])&&preg_match('/^[\u0590-\u05fe ]+$/',$_POST['name'])&&is_numeric($_POST['stars'])&&$_POST['stars']>0&&$_POST['stars']<6){

\ 如果是真的 }

我收到以下错误：

警告：preg_match()：编译失败：PCRE 不支持偏移 12 处的 \L、\l、\N{name}、\U 或 \u

这是电子邮件标题：

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