JSON :: XS“用法"发牢骚

问题描述

我似乎无法正确使用JSON::XS的OO接口.以下错误伴我无法追踪:

I can't seem to use JSON::XS's OO interface properly. The following croaks with an error I can't track down:

use JSON::XS;
my $array = ['foo', 'bar'];

my $coder = JSON::XS->new->utf8->pretty;
print $coder->encode_json($array);

此错误与以下内容有关:Usage: JSON::XS::encode_json(scalar) at test.pl line 5.我一直在梳理JSON::XS的代码，但在任何地方都找不到用法:"警告.我的用法似乎与文档中的示例非常匹配.谁能告诉我我哪里出问题了?

This croaks with the following: Usage: JSON::XS::encode_json(scalar) at test.pl line 5. I have been combing through the code for JSON::XS and I can't find a "Usage:" warning anywhere. My usage seems to be pretty well matched with the examples in the documentation. Can anyone tell me where I have gone wrong?

推荐答案

JSON::XS 具有两个接口:功能和面向对象.

JSON::XS has two interfaces: functional and OO.

• 在功能界面中，功能名称为encode_json.
• 在OO界面中，方法只是encode，而不是encode_json.

• In the functional interface, the function name is encode_json.
• In the OO interface, the method is simply encode, not encode_json.

以下两个摘录均起作用:

Both of the following two snippets work:

# Functional                  | # OO
------------------------------+-----------------------------------------
                              | 
use JSON::XS;                 | use JSON::XS;
my $array = ['foo', 'bar'];   | my $array = [ 'foo', 'bar' ];
                              |
print encode_json($array);    | my $coder = JSON::XS->new->utf8->pretty;
                              | print $coder->encode($array);
                              |
# ["foo","bar"]               | # [
                              | #    "foo",
                              | #    "bar"
                              | # ]

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