我有一个场景，在构造表单数据时，嵌套的JSON必须以线性方式序列化，因为这是服务器期望值的方式。所以，我写了一个小的递归函数来翻译JSON，就像这样:

{
   "orderPrice":"11",
   "cardNumber":"************1234",
   "id":"8796191359018",
   "accountHolderName":"Raj Pawan",
   "expiryMonth":"02",
   "expiryYear":"2019",
   "issueNumber":null,
   "billingAddress":{
      "city":"Wonderland",
      "code":"8796682911767",
      "firstname":"Raj Pawan",
      "lastname":"Gumdal",
      "line1":"Addr Line 1",
      "line2":null,
      "state":"US-AS",
      "region":{
         "isocode":"US-AS"
      },
      "zip":"76767-6776"
   }
}

变成这样:

{
   "orderPrice":"11",
   "cardNumber":"************1234",
   "id":"8796191359018",
   "accountHolderName":"Raj Pawan",
   "expiryMonth":"02",
   "expiryYear":"2019",
   "issueNumber":null,
   "billingAddress.city":"Wonderland",
   "billingAddress.code":"8796682911767",
   "billingAddress.firstname":"Raj Pawan",
   "billingAddress.lastname":"Gumdal",
   "billingAddress.line1":"Addr Line 1",
   "billingAddress.line2":null,
   "billingAddress.state":"US-AS",
   "billingAddress.region.isocode":"US-AS",
   "billingAddress.zip":"76767-6776"
}

服务器将接受这种转换格式的表单数据。

函数如下:

function jsonToFormData (inJSON, inTestJSON, inFormData, parentKey) {
    // http://stackoverflow.com/a/22783314/260665
    // Raj: Converts any nested JSON to formData.
    var form_data = inFormData || new FormData();
    var testJSON = inTestJSON || {};
    for ( var key in inJSON ) {
        // 1. If it is a recursion, then key has to be constructed like "parent.child" where parent JSON contains a child JSON
        // 2. Perform append data only if the value for key is not a JSON, recurse otherwise!
        var constructedKey = key;
        if (parentKey) {
            constructedKey = parentKey + "." + key;
        }

        var value = inJSON[key];
        if (value && value.constructor === {}.constructor) {
            // This is a JSON, we now need to recurse!
            jsonToFormData (value, testJSON, form_data, constructedKey);
        } else {
            form_data.append(constructedKey, inJSON[key]);
            testJSON[constructedKey] = inJSON[key];
        }
    }
    return form_data;
}

调用:

        var testJSON = {};
        var form_data = jsonToFormData (jsonForPost, testJSON);

我使用testJSON只是为了查看转换后的结果，因为我无法提取form_data的内容。AJAX post call:

        $.ajax({
            type: "POST",
            url: somePostURL,
            data: form_data,
            processData : false,
            contentType : false,
            success: function (data) {
            },
            error: function (e) {
            }
        });

我使用这个Post我的对象数据作为表单数据。

const encodeData = require('querystring');

const object = {type: 'Authorization', username: 'test', password: '123456'};

console.log(object);
console.log(encodeData.stringify(object));

将处理嵌套数组和对象的解决方案。有人可能会觉得有用

             function add_form_data(form_data,key,item,arr){
                if(typeof(item)==='object' && item && item.constructor===Array){
                    for(var i=0;i<item.length;i++){
                        var item2=item[i];
                        var key2=key+'[' + i +']';
                        if(arr){
                            key2=key+'[' + key2 +']';
                        }
                        add_form_data(form_data,key2,item2,true);
                    }
                }else if(typeof(item)==='object' && item){
                    for ( var key2 in item ) {
                        var item2=item[key2];
                        if(arr){
                            key2=key+'[' + key2 +']';
                        }
                        add_form_data(form_data,key2,item2,arr);
                    }
                }else{
                    form_data.append(key,item);
                }
            }

使用

            var form_data = new FormData();
            
            add_form_data(form_data,null,json_data);// provide json_data here
             
            var string_url_data=new URLSearchParams(form_data).toString();// if query string is needed

这个方法将一个JS对象转换为一个FormData:

function convertToFormData(params) { return Object.entries(params) .reduce((acc, [key, value]) => { if (Array.isArray(value)) { value.forEach((v, k) => acc.append(`${key}[${k}]`, value)); } else if (typeof value === 'object' && !(value instanceof File) && !(value instanceof Date)) { Object.entries(value).forEach((v, k) => acc.append(`${key}[${k}]`, value)); } else { acc.append(key, value); } return acc; }, new FormData()); }

函数toFormData(o) { 返回Object.entries (o) .reduce ((d, e) = > (d.append e(…),d),新FormData ()) ｝ Var对象= { 用户名:“JohnDoe”, 文件:新文件(“foo”,“foo.txt”,{类型:“文本/普通”}) ｝ fetch (https://httpbin.org/post, { 方法:“文章”, 身体:toFormData(对象) })。Then (r => r.json()).then(console.log)

尝试JSON。函数如下所示

var postData = JSON.stringify(item);
var formData = new FormData();
formData.append("postData",postData );