从 javascript for 循环创建 JSON 字符串
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Create JSON string from javascript for loop
提问by Sthe
I want to create a JSON string from a javascript for loop. This is what I tried to do (which gives me something that looks like a JSON string), but it does not work.
我想从 javascript for 循环创建一个 JSON 字符串。这就是我试图做的（它给了我一些看起来像 JSON 字符串的东西），但它不起作用。
var edited = "";
for(var i=1;i<POST.length-1;i++) {
edited += '"'+POST[i].name+'":"'+POST[i].value+'",';
}
It gives me this:
它给了我这个：
"type":"empty","name":"email-address","realname":"Email Address","status":"empty","min":"empty","max":"empty","dependson":"empty",
This does not work if I try to convert it into a JSON object later.
如果我稍后尝试将其转换为 JSON 对象，这将不起作用。
回答by Digital Plane
Two problems:
两个问题：
- You want an object, so the JSON string has to start with
{and end with}. - There is a trailing
,which may be recognized as invalid.
- 你想要一个对象，因此JSON字符串必须开始
{和结束}。 - 有
,可能被识别为无效的尾随。
It's probably better to use a library, but to correct your code:
使用库可能更好，但要更正您的代码：
- Change
var edited = "";tovar edited = "{";to start your JSON string with a{ - Add
edited = edited.slice(0, -1);after the for loop to remove the trailing comma. - Add
edited += "}";after the previous statement to end your JSON string with a}
- 更改
var edited = "";为var edited = "{";以开头的 JSON 字符串{ edited = edited.slice(0, -1);在 for 循环之后添加以删除尾随逗号。edited += "}";在上一条语句之后添加以结束您的 JSON 字符串}
Your final code would be:
您的最终代码将是：
var edited = "{";
for(var i=1;i<POST.length-1;i++) {
edited += '"'+POST[i].name+'":"'+POST[i].value+'",';
}
edited = edited.slice(0, -1);
edited += "}";
Again, it's best to use a library (e.g. JSON.stringify) by making an object with a for loop, adding properties by using POST[i].nameas a key and POST[i].valueas the value, then using the library to convert the object to JSON.
同样，最好通过使用JSON.stringifyfor 循环创建对象来使用库（例如），通过POST[i].name用作键和POST[i].value值来添加属性，然后使用库将对象转换为 JSON。
Also, you are starting with index 1and ending with index POST.length-2, therefore excluding indices 0(the first value) and POST.length-1(the last value). Is that what you really want?
此外，您以 index 开头并以 index1结尾POST.length-2，因此不包括索引0（第一个值）和POST.length-1（最后一个值）。这真的是你想要的吗？
回答by Praveen Prasad
//dummy data
var post=[{name:'name1',value:1},{name:'name2',value:2}];
var json=[];
for(var i=0;i<post.length;i++)
{
var temp={};
temp[post[i].name]=post[i].value;
json.push(temp);
}
var stringJson = JSON.stringify(json);
alert(stringJson );
回答by Tomas Jansson
Can't you just build up a hash and do toStringon the hash? Something like this:
你不能只是建立一个散列并toString在散列上做吗？像这样的东西：
var edited = {};
for(var i=0;i<POST.length-1;i++) {
edited[POST[i].name] = POST[i].value;
}
Or maybe JSON.stringifyis what you are looking for: http://www.json.org/js.html
或者也许JSON.stringify是你正在寻找的：http: //www.json.org/js.html
回答by Im0rtality
You have extra comma in your JSON string. JSON string format: {"JSON": "Hello, World"}
您的 JSON 字符串中有多余的逗号。JSON 字符串格式：{"JSON": "Hello, World"}
var edited = "{";
for(var i=1;i<POST.length-1;i++) {
edited += '"'+POST[i].name+'":"'+POST[i].value+'",';
}
// remove last comma:
edited = edited.substring(0, edited.length-1) + "}";
