从字符串中删除前导和尾随空格

s = "  Hello World!  "
s = s.strip()
print(s)

let s = "  Hello World!  ";
s = s.trim();
console.log(s);

String s = "  Hello World!  ";
s = s.trim();
System.out.println(s);

string s = "  Hello World!  ";
s = s.Trim();
Console.WriteLine(s);

$s = "  Hello World!  ";
$s = trim($s);
echo $s;