less-字符串、长度相关函数

div{
//  d:escape('#, ^, (, ), {, }, |, :, >, <, ;, ], [ , =');
//  filter: e("ms:alwaysHasItsOwnSyntax.For.Stuff()");
//  filter: ~"ms:alwaysHasItsOwnSyntax.For.Stuff()";
////  width: calc(960px-100px);
//  width: calc(~'960px-100px');
//  height: calc(~'960px-100px');
//  font-family: %( "%a %a" , "Microsoft", "YaHei");
//  font-family: ""Microsoft" "YaHei"";

//  font-family: %( "%A %a" , "Microsoft", "YaHei");
//  font-family: "%22Microsoft%22 "YaHei"";

//  font-family: %( "%s %s" , F60, "YaHei");

//  font-family: %( "%s %s" , "Microsoft", "YaHei");
//  font-family: "Microsoft YaHei";

//content: replace("Hello, maizi", "maizi", "LESS");
//  content: replace("Hello, A", "A", "B");

//n:length(1px solid #0080ff);

  @list: "A", "B", "C", "D";
  n:extract(@list,4)
}

生成的css：

div {
  n: "D";
}