JSON 未正确转换长数字
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JSON Not converting long numbers appropriately
提问by Jeet
I have a simple JSON where number is not getting parsed properly.
我有一个简单的 JSON，其中数字没有被正确解析。
[
{
"orderNumber": 1,
"customerId": 228930314431312345,
"shoppingCartId": 22893031443137109,
"firstName": "jjj"
}
]
I tried it @ http://www.utilities-online.info/xmltojson/and the result was
我在@ http://www.utilities-online.info/xmltojson/尝试过，结果是
<?xml version="1.0" encoding="UTF-8" ?>
<orderNumber>1</orderNumber>
<customerId>228930314431312350</customerId>
<shoppingCartId>22893031443137108</shoppingCartId>
<firstName>jjj</firstName>
As you can see....the XML is different from JSON. I'm new to JSON. Am I missing something?
如您所见....XML 与 JSON 不同。我是 JSON 的新手。我错过了什么吗？
采纳答案by Aiias
This is a Javascript precision problem.
这是一个 Javascript 精度问题。
According to Mozilla Developer Network:
根据 Mozilla 开发者网络：
ECMA-262 only requires a precision of up to 21 significant digits. Other implementations may not support precisions higher than required by the standard.
ECMA-262 只需要最多 21 位有效数字的精度。其他实现可能不支持高于标准要求的精度。
Source: https://developer.mozilla.org/en-US/docs/JavaScript/Reference/Global_Objects/Number/toPrecision
来源：https: //developer.mozilla.org/en-US/docs/JavaScript/Reference/Global_Objects/Number/toPrecision
I pasted your array into Google Chrome's Javascript console and got back this:
我将您的数组粘贴到 Google Chrome 的 Javascript 控制台中并得到了这个：
So it looks like Javascript is rounding the values before they are being converted to XML. Since your conversion is being done via Javascript in the browser at http://www.utilities-online.info/xmltojson/, it makes sense why the number was changed.
因此，看起来 Javascript 在将值转换为 XML 之前会对其进行四舍五入。由于您的转换是通过浏览器中的 Javascript 完成的，网址为http://www.utilities-online.info/xmltojson/，因此更改数字的原因是有道理的。
(Note: I tested on Google Chrome version 26.0.1410.43 m using Windows 7 Professional)
（注：我使用 Windows 7 Professional 在 Google Chrome 版本 26.0.1410.43 m 上进行了测试）
Edit:
编辑：
Is there any reason why you cannot pass these values to Javascript as strings?
有什么理由不能将这些值作为字符串传递给 Javascript？
Try this:
尝试这个：
[
{
"orderNumber": "1",
"customerId": "228930314431312345",
"shoppingCartId": "22893031443137109",
"firstName": "jjj"
}
]
I was able to do this and save the values successfully. However, you will not be able to run a math calculation on them in Javascript without losing some precision, unless you are doing something like multiplying by 0, of course.
我能够做到这一点并成功保存值。但是，您将无法在 Javascript 中对它们进行数学计算而不会损失一些精度，除非您正在执行乘以 0 之类的操作，当然。
This also converted to XML correctly using your reference http://www.utilities-online.info/xmltojson/.
这也使用您的参考http://www.utilities-online.info/xmltojson/正确转换为 XML 。
