JSON无法编译，原因是:应为“字符串”、“数字”、“NULL”、“TRUE”、“FALSE”、“{”、“[”，得到了“未定义的”

Question

所以我写了一个JSON文件代码来帮助显示书名，但是当我编译时，我总是收到同样的错误，有办法修复吗？还是我做错了什么？

代码如下：

jsoniq version "1.0";
let $file: = {
    {
        "title": "Fifty Shades of Grey",
        "author": "E.L.",
        "date_read": {
            "month": "May",
            "year": "2016"
        },
        "opinion": "Did not like very much"
    },
    {
        "title": "The grass is singing",
        "author": "Doris Lessing",
        "date_read": {
            "month": "June",
            "year": "2016"
        },
        "opinion": "Enjoyed quite a bit"
    },
    {
        "title": "A short history on nearly everything",
        "author": "Bill Bryson",
        "date_read": {
            "month": "July",
            "year": "2016"
        },
        "opinion": "Very informative"
    },
    {
        "title": "JSON in 24 hours",
        "author": "Peter Settler",
        "purpose": "Work"
    },
    {}
}
for $x in $file
return $x.title

已显示的错误：

Error: Parse error on line 1:
jsoniq version "1.0"
^
Expecting 'STRING', 'NUMBER', 'NULL', 'TRUE', 'FALSE', '{', '[', got 'undefined'

Answer 1

JSO 尼克代码存在两个问题：

• $file
后 ：和 （…）应该用于创建对象序列，而不是 {…} ，因为

我希望这有帮助！这个查询应该可以工作（我用RumbleDB测试了它）：

jsoniq version "1.0";
let $file := (
  { "title": "Fifty Shades of Grey", "author": "E.L.", "date_read": { "month": "May", "year": "2016" }, "opinion": "Did not like very much" },
  { "title": "The grass is singing", "author": "Doris Lessing", "date_read": { "month": "June", "year": "2016" }, "opinion": "Enjoyed quite a bit" },
  { "title": "A short history on nearly everything", "author": "Bill Bryson", "date_read": { "month": "July", "year": "2016" }, "opinion": "Very informative" },
  { "title": "JSON in 24 hours", "author": "Peter Settler", "purpose": "Work" },
  {}
)
for $x in $file
return $x.title

另一种想法是：您收到的错误消息可能表明您试图将此代码输入JSON解析器，而不是JSONiq引擎。从语法上讲，JSON是JSONiq的子集，因此您可以将JSON提供给任何JSONiq引擎，它将“返回自身”。然而，JSONiq不是JSON的子集，因此它不能以相反的方式工作。