利用范围：

my $cache = CHI->new( driver => 'File',expires_in => 3600 );

sub one {
    if ( my $data = $cache->get( 'key_one' ) ) {
    # ...
}

sub two {
    if ( my $data = $cache->get( 'key_two' ) ) {
    # ...
}

传递对象作为参数：

my $cache = CHI->new( driver => 'File',expires_in => 3600 );

sub one {
    my ( $cache ) = @_;
    if ( my $data = $cache->get( 'key_one' ) ) {
    # ...
}

sub two {
    my ( $argument1,$cache ) = @_;
    if ( my $data = $cache->get( 'key_two' ) ) {
    # ...
}

或在子程序中创建一个新实例：

sub one {
    my $cache = CHI->new( driver => 'File',expires_in => 3600 );
    if ( my $data = $cache->get( 'key_one' ) ) {
    # ...
}

sub two {
    my $cache = CHI->new( driver => 'File',expires_in => 3600 );
    if ( my $data = $cache->get( 'key_two' ) ) {
    # ...
}