字符串到JSON的转换

Question

我有像这样的线

{Name: India, Path: test.png, Id: 1, Uri: /api/1}

通过Javascript，我尝试这样解析这个值

 var sCountry = document.getElementById("countries").value; // this will give value as {Name: India, Path: test.png, Id: 1, Uri: /api/1}

  var fixedJSON = sCountry 

          // Replace ":" with "@colon@" if it's between double-quotes
                  .replace(/:\s*"([^"]*)"/g, function(match, p1) {
                    return ': "' + p1.replace(/:/g, '@colon@') + '"';
                  })

                  // Replace ":" with "@colon@" if it's between single-quotes
                  .replace(/:\s*'([^']*)'/g, function(match, p1) {
                    return ': "' + p1.replace(/:/g, '@colon@') + '"';
                  })

                  // Add double-quotes around any tokens before the remaining ":"
                  .replace(/(['"])?([a-z0-9A-Z_]+)(['"])?\s*:/g, '"$2": ')

                  // Turn "@colon@" back into ":"
                  .replace(/@colon@/g, ':')
  ;

  console.log('Before: ' + sCountry);
  console.log('After: ' + fixedJSON);//Output comes like this {"Name":  India, "Path":  test.png, "Id":  1, "Uri":  /api/1}

  var obj = JSON.parse(fixedJSON);

它会产生这样的错误

   unexpected token e in json at position 10 at json.parse 

我猜输出应该是这样的

  {"Name":  "India" , "Path":  "test.png", "Id":  1, "Uri":  "/api/1"}

有人能帮我解决这个字符串到JSON的转换吗？这样我就可以解析并获得"Id“的值

Answer 1

尝试使用split and join：

我已经列出了所需的每个步骤，但您可能可以将其简化得多。

​

let val = '{"Name":  India, "Path":  test.png, "Id":  1, "Uri":  /api/1}';

// Remove brackets from string (first and last char)
let valWithoutBrackets = val.substring(1, val.length-1);

// Make key value pair array in string format (delimited by : )
let keyValuePairStrings = valWithoutBrackets.split(",");

// Make two dimensional key value pair array
let keyValuePairs = keyValuePairStrings.map(k => k.split(":").map(kv => kv.trim()));

// Map all values to values with brackets, except Id
let keyValuePairsWithBrackets = keyValuePairs.map(k => {
  if(k[0] != '"Id"') {
    k[1] = `"${k[1]}"`;
  }
  return k;
});

// Make two dimensional key value pair array to key value string array
let resultKeyValuePairStrings = keyValuePairsWithBrackets.map(k => k.join(":"));

// Make key value string array to list of keyvalues and add brackets again
let resultString = `{${resultKeyValuePairStrings.join(",")}}`;

// Log the parsed JSON Id
let obj = JSON.parse(resultString);
console.log(obj);
console.log(obj.Id);

​

此外，如果您直接将其添加到我的代码中，则可以跳过正则表达式的内容，如下所示：

​

let val = '{Name: India, Path: test.png, Id: 1, Uri: /api/1}';

// Remove brackets from string (first and last char)
let valWithoutBrackets = val.substring(1, val.length-1);

// Make key value pair array in string format (delimited by : )
let keyValuePairStrings = valWithoutBrackets.split(",");

// Make two dimensional key value pair array
let keyValuePairs = keyValuePairStrings.map(k => k.split(":").map(kv => kv.trim()));

// Map all values to values with brackets, except Id
let keyValuePairsWithBrackets = keyValuePairs.map(k => {
  if(k[0] != 'Id') {
    k[1] = `"${k[1]}"`;
  }
  k[0] = `"${k[0]}"`;  // <-- Also put the key under quotations
  return k;
});

// Make two dimensional key value pair array to key value string array
let resultKeyValuePairStrings = keyValuePairsWithBrackets.map(k => k.join(":"));

// Make key value string array to list of keyvalues and add brackets again
let resultString = `{${resultKeyValuePairStrings.join(",")}}`;

// Log the parsed JSON Id
let obj = JSON.parse(resultString);
console.log(obj);
console.log(obj.Id);

​

Answer 2

通过转换为JSON，您可以使用split轻松获取所需的项目：

var result = sCountry.split(/ *, */);
var path = result[1].split(/ *: */)[1];
var id = result[2].split(/ *: */)[1];

请添加一些错误检查，以防得到意外格式的字符串。