my @products = (
{"value"=> "apple", "mount"=>"1"},
{"value"=> "bag", "mount"=>"2"},
{"value"=> "car", "mount"=>"3"}
);
移除value为bag的hash,返回新的数组
my @newproducts = (
{"value"=> "apple", "mount"=>"1"},
{"value"=> "car", "mount"=>"3"}
);