Hi Perl_Love,

There are two separate things going on here:

First, class="a b" specifies that the anchor has two separate classes, named "a" and "b".

Second, the selector 'a.a b' means to select an element b (bold) that is a descendant of an a element (anchor) of class "a".

So to make your second example work, you could specify the selector to match an anchor that has both classes by chaining them, giving "a.a.b":

use Mojo::DOM;
my $dom = Mojo::DOM->new();
my $test2=$dom->parse('<a class="a b">2016-05-18</a>')->at('a.a.b')->t
+ext;
print "$test2\n";
__END__
2016-05-18
[download]

Hope this helps,
-- Hauke D

great~thank a lot! it's work! haha~

->at('a.a b') can't work, since a and b are different classes.

Probably ->at('a.a')->at('a.b') does, but that's only a guess without reading the documentation of Mojo::DOM .

update

After reading the docs, give this a try

->at('a[class~="a"][class~="b"]');

#!/usr/bin/perl
use Mojo::DOM;
my $dom = Mojo::DOM->new();
$|=1;
$text='
    <a class="ab">2016-05-18</a>
    <a class="a b">2016-05-19</a>
    <a class="b">2016-05-20</a>
    <a class="a">2016-05-21</a>
';
my $test1=$dom->parse($text)->at('a.ab')->text;
print "18: $test1\n";
my @test2=$dom->parse($text)->find('a.a b')->map('text')->each;
print "19: @test2 (bad)\n";
my $test3=$dom->parse($text)->at('a.a.b')->text;
print "19: $test3\n";
[download]

18: 2016-05-18
19: 2016-05-18 2016-05-19 2016-05-20 2016-05-21 (bad)
19: 2016-05-19
[download]

Note, the find('a.a b') does not match anything, so to make it more interesting, I did a find('a. a b')

use Mojo::DOM;
$|=1;
my $text='<span class="f-f60 fb">one</span>two</li>
<li>three<span class="f-f60 fb" id="deliveryCount">WORK</span>five</li
+>
<li>ABC<span class="f-f60 fb" id="contactCount">XYZ</span>
';
my $dom = Mojo::DOM->new($text);

for my $e ($dom->find('span[id]')->each) {
    my $id=$e->{id};
    if($id eq 'deliveryCount'){
        print $id, ':', $e->text, "\n";
    }
}
[download]

Thank you ! May I ask another question ? How to directly locate deliveryCount,get text content WORK? Is it not need to use loop method,such as for,to lookup spanid?

my $foo=$dom->at('#deliveryCount')->text;
[download]

I get it~