Javascript 这个JSON字符串有什么问题？使用Rails和ActiveSupport进行解码

我们使用的是Rails 3.0.6

当我们试图在控制器中使用ActiveSupport:：JSON对以下JSON字符串进行解码时，会生成一个无效的JSON字符串错误。我们无法找出产生错误的原因，但我们知道它与draw\u data\u url键有关

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","guesses":{"4f6a20238cb45b16c00002a8":null},"turn_num":1,"word_value":null,"drawer_id":"4f68ed4b8cb45b16c0000111","value":2}]"

这就是为什么：

base64，

之后的换行符在此处无效（忽略尾随引号和前导引号）：

第1221行的分析错误： ... “绘图数据url”：“数据：图像/png；bas” -----------------------^ 应为“STRING”、“NUMBER”、“NULL”、“TRUE”、“FALSE”、“{”、“[”

---

如果要在字符串中包含文字换行符，则必须使用jsonlint.com将其转义为

\n

，因为它在draw\u data\u url值中检测到换行符

---

一旦它被删除，它将进行良好的验证：

JSON格式是key/value

{"key": value, "key2": value}

---

您的第一个（奇怪的）键似乎没有值。

谢谢！我们查看了文本，无法确定问题所在……难怪，这是一个换行符！再次感谢！顺便说一句，“draw\u data\u url”的值来自canvas.toDataURL（）。如果插入换行符，我们是否做错了什么？另外，如果换行符在字符串中没有表示为“\n”，我们应该搜索哪个字符并替换为“\n”“？如果这些是愚蠢的问题，很抱歉。请检查

\r

。或者用

/\s+/g

删除/替换所有空格……我认为这些URL无论如何都不需要有空格。谢谢，Felix……当您说同时检查“\n”时有点困惑，因为我认为我们应该用“\n”替换换行符。”建议换行符由“\n”以外的内容表示？抱歉：D我的意思是

\r

（在我的头脑中弄糊涂了；）…已更正。您知道如何以编程方式删除换行符吗？该值直接来自canvas.toDataURL（）。如果插入换行符，我们是否做错了什么？

{"key": value, "key2": value}