JSON 空字符串
声明：本页面是StackOverFlow热门问题的中英对照翻译，遵循CC BY-SA 4.0协议，如果您需要使用它，必须同样遵循CC BY-SA许可，注明原文地址和作者信息，同时你必须将它归于原作者（不是我）：StackOverFlow
原文地址: http://stackoverflow.com/questions/1543791/
Warning: these are provided under cc-by-sa 4.0 license. You are free to use/share it, But you must attribute it to the original authors (not me):
StackOverFlow
JSON empty string
提问by
why does the JSON.stringify-Function converts a string.Empty ("") to a "null"-String? The problem, why i'm not using:
为什么 JSON.stringify-Function 将 string.Empty ("") 转换为 "null"-String？问题，为什么我不使用：
JSON.parse(json, function(key, value) {
if (typeof value === 'string') {
if (value == 'null')
return '';
return value;
}
});
...is, if somebody really write "null" (is very unlikely, but possible), i have a problem to...
...是，如果有人真的写“null”（不太可能，但可能），我有一个问题......
thank for each answer!
感谢每个答案！
回答by John
Old question - but its the top result when you search for 'json stringify empty string' so I'll share the answer I found.
老问题 - 但它是搜索“json stringify empty string”时的最佳结果，所以我将分享我找到的答案。
This appears to be a bug in certain versions of IE8, where empty DOM elements return a value which looks like an empty string, evaluates true when compared to an empty string, but actually has some different encoding denoting that it is a null value.
这似乎是 IE8 某些版本中的错误，其中空 DOM 元素返回一个看起来像空字符串的值，与空字符串相比评估为 true，但实际上有一些不同的编码表示它是一个空值。
One solution is to do a replace whenever you call stringify.
一种解决方案是在调用 stringify 时进行替换。
JSON.stringify(foo, function(key, value) { return value === "" ? "" : value });
JSON.stringify(foo, function(key, value) { return value === "" ? "" : value });
回答by John
now the esiest solution for this problem is, to pack the "document.getElementById('id').value" expression in the constructor of the String class:
现在解决这个问题最简单的方法是在 String 类的构造函数中打包“document.getElementById('id').value”表达式：
JSON.stringify({a:new String(document.getElementById('id').value)}); -> {"a":""}
i can't find the primary problem, but with this, it's working well in Internet Explorer as well in FireFox.
我找不到主要问题，但是有了这个，它在 Internet Explorer 和 FireFox 中都运行良好。
i'm not very happy with this dirty solution, but the effort is not to much.
我对这个肮脏的解决方案不太满意，但努力并不多。
JSON library: https://github.com/douglascrockford/JSON-js/blob/master/json2.js
JSON 库：https: //github.com/douglascrockford/JSON-js/blob/master/json2.js
