Javascript Node.js 中的 JSON 数组
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/11911438/
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 array in Node.js
提问by Chad
I have been trying to figure this out for the past week and everything that i try just doesn't seem to work.
过去一周我一直在努力解决这个问题，但我尝试的一切似乎都不起作用。
I have to create a web service on my local box that responds to requests. The client (that i did not write) will ask my service one question at a time, to which my server should respond with an appropriate answer.
我必须在我的本地机器上创建一个响应请求的 Web 服务。客户端（不是我写的）会一次问我一个问题，我的服务器应该以适当的答案回应。
So the last thing i have to do is:
所以我要做的最后一件事是：
When a POSTrequest is made at location '/sort'with parameter 'theArray', sort the array removing all non-string valuesand return the resulting value as JSON.
- theArrayparameter will be a stringified JSON Array
当在位置'/sort'使用参数'theArray'发出POST请求时，对数组进行排序，删除所有非字符串值，并将结果值作为JSON返回。
- theArray参数将是一个字符串化的 JSON 数组
From going through trail and error i have found out that the parameters supplied is:
通过跟踪和错误，我发现提供的参数是：
{"theArray":"[[],\"d\",\"B\",{},\"b\",12,\"A\",\"c\"]"}
I have tried many different thing to try to get this to work. But the closest thing i can get is it only returning the same thing or nothing at all. This is the code that i am using to get those results:
我尝试了许多不同的方法来尝试让它发挥作用。但我能得到的最接近的是它只返回相同的东西或根本不返回。这是我用来获得这些结果的代码：
case '/sort':
if (req.method == 'POST') {
res.writeHead(200,{
'Content-Type': 'application/json',
'Access-Control-Allow-Origin': '*'
});
var fullArr = "";
req.on('data', function(chunk) {
fullArr += chunk;
});
req.on('end', function() {
var query = qs.parse(fullArr);
var strin = qs.stringify(query.theArray)
var jArr = JSON.parse(fullArr);
console.log(jArr); // Returns undefided:1
var par = query.theArray;
console.log(par); // returns [[],"d","B",{},"b",12,"A","c"]
function censor(key) {
if (typeof key == "string") {
return key;
}
return undefined;
}
var jsonString = JSON.stringify(par, censor);
console.log(jsonString); // returns ""
});
res.end();
};
break;
Just to clarify what I need it to return is ["d","B","b","A","c"]
只是为了澄清我需要它返回的是 ["d","B","b","A","c"]
So if someone can please help me with this and if possible responded with some written code that is kinda set up in a way that would already work with the way i have my code set up that would be great! Thanks
因此，如果有人可以帮助我解决这个问题，并且如果可能的话，用一些书面代码做出回应，这些代码的设置方式已经可以与我设置代码的方式一起使用，那就太好了！谢谢
回答by davidbuzatto
Edit:Try this:
编辑：试试这个：
var query = {"theArray":"[[],\"d\",\"B\",{},\"b\",12,\"A\",\"c\"]"};
var par = JSON.parse(query.theArray);
var stringArray = [];
for ( var i = 0; i < par.length; i++ ) {
if ( typeof par[i] == "string" ) {
stringArray.push(par[i]);
}
}
var jsonString = JSON.stringify( stringArray );
console.log(jsonString);
P.S. I didnt't pay attention. Your array was actually a string. Andrey, thanks for the tip.
PS我没注意。你的数组实际上是一个字符串。安德烈，谢谢你的提示。
回答by Andrey Sidorov
edit: one-liner (try it in repl!)
编辑：单行（在 repl 中尝试！）
JSON.stringify(JSON.parse(require('querystring').parse('theArray=%5B%5B%5D%2C"d"%2C"B"%2C%7B%7D%2C"b"%2C12%2C"A"%2C"c"%5D').theArray).filter(function(el) {return typeof(el) == 'string'}));
code to paste to your server:
粘贴到您的服务器的代码：
case '/sort':
if (req.method == 'POST') {
buff = '';
req.on('data', function(chunk) { buff += chunk.toString() });
res.on('end', function() {
var inputJsonAsString = qs.parse(fullArr).theArray;
// fullArr is x-www-form-urlencoded string and NOT a valid json (thus undefined returned from JSON.parse)
var inputJson = JSON.parse(inputJsonAsString);
var stringsArr = inputJson.filter(function(el) {return typeof(el) == 'string'});
res.writeHead(200,{
'Content-Type': 'application/json',
'Access-Control-Allow-Origin': '*'
});
res.end(JSON.stringify(stringsArr));
};
break;
回答by Michelle Tilley
The replacerparameter of JSON.stringifydoesn't work quite like you're using it; check out the documentation on MDN.
的replacer参数JSON.stringify不像你使用的那样工作；查看MDN 上的文档。
You could use Array.prototype.filterto filter out the elements you don't want:
您可以使用Array.prototype.filter过滤掉不需要的元素：
var arr = [[],"d","B",{},"b",12,"A","c"];
arr = arr.filter(function(v) { return typeof v == 'string'; });
arr // => ["d", "B", "b", "A", "c"]
