Use:

function form_to_json (selector) {
  var ary = $(selector).serializeArray();
  var obj = {};
  for (var a = 0; a < ary.length; a++) obj[ary[a].name] = ary[a].value;
  return obj;
}

输出：

{"myfield": "myfield value", "passwordfield": "mypasswordvalue"}

将任何东西变成对象（未经单元测试）

<script type="text/javascript">
string = {};

string.repeat = function(string, count)
{
    return new Array(count+1).join(string);
}

string.count = function(string)
{
    var count = 0;

    for (var i=1; i<arguments.length; i++)
    {
        var results = string.match(new RegExp(arguments[i], 'g'));
        count += results ? results.length : 0;
    }

    return count;
}

array = {};

array.merge = function(arr1, arr2)
{
    for (var i in arr2)
    {
        if (arr1[i] && typeof arr1[i] == 'object' && typeof arr2[i] == 'object')
            arr1[i] = array.merge(arr1[i], arr2[i]);
        else
            arr1[i] = arr2[i]
    }

    return arr1;
}

array.print = function(obj)
{
    var arr = [];
    $.each(obj, function(key, val) {
        var next = key + ": ";
        next += $.isPlainObject(val) ? array.print(val) : val;
        arr.push( next );
      });

    return "{ " +  arr.join(", ") + " }";
}

node = {};

node.objectify = function(node, params)
{
    if (!params)
        params = {};

    if (!params.selector)
        params.selector = "*";

    if (!params.key)
        params.key = "name";

    if (!params.value)
        params.value = "value";

    var o = {};
    var indexes = {};

    $(node).find(params.selector+"["+params.key+"]").each(function()
    {
        var name = $(this).attr(params.key),
            value = $(this).attr(params.value);

        var obj = $.parseJSON("{"+name.replace(/([^\[]*)/, function()
        {
            return '"'+arguments[1]+'"';
        }).replace(/\[(.*?)\]/gi, function()
        {
            if (arguments[1].length == 0)
            {
                var index = arguments[3].substring(0, arguments[2]);
                indexes[index] = indexes[index] !== undefined ? indexes[index]+1 : 0;

                return ':{"'+indexes[index]+'"';
            }
            else
                return ':{"'+escape(arguments[1])+'"';
        })+':"'+value.replace(/[\\"]/gi, function()
        {
            return "\\"+arguments[0]; 
        })+'"'+string.repeat('}', string.count(name, ']'))+"}");

        o = array.merge(o, obj);
    });

    return o;
}
</script>

测试输出：

$(document).ready(function()
{
    console.log(array.print(node.objectify($("form"), {})));
    console.log(array.print(node.objectify($("form"), {selector: "select"})));
});

on

<form>
    <input name='input[a]' type='text' value='text'/>
    <select name='input[b]'>
        <option>select</option>
    </select>

    <input name='otherinput[c][a]' value='a'/>
    <input name='otherinput[c][]' value='b'/>
    <input name='otherinput[d][b]' value='c'/>
    <input name='otherinput[c][]' value='d'/>

    <input type='hidden' name='anotherinput' value='hidden'/>
    <input type='hidden' name='anotherinput' value='1'/>

    <input type='submit' value='submit'/>
</form>

将产生：

{ input: { a: text, b: select }, otherinput: { c: { a: a, 0: b, 1: d }, d: { b: c } }, anotherinput: 1 }
{ input: { b: select } }

我喜欢使用Array.prototype.reduce，因为它是一个单行程序，并且不依赖Undercore.js或类似工具：

$('#formid').serializeArray()
    .reduce(function(a, x) { a[x.name] = x.value; return a; }, {});

这与使用Array.prototype.map的答案类似，但不需要使用额外的对象变量来扰乱作用域。一站式购物。

重要提示：输入具有重复名称属性的表单是有效的HTML，实际上是一种常见的方法。在这种情况下，使用此线程中的任何答案都是不合适的（因为对象键必须是唯一的）。

此代码转换并保存输入类型，而不是全部转换为字符串：

jQuery.fn.serializeForm = function () {
    var form = this.get(0);
    var i = [];
    var ret = {};
    for (i = form.elements.length - 1; i >= 0; i = i - 1) {
        if (form.elements[i].name === "") {
            continue;
        }
        var name = form.elements[i].name;
        switch (form.elements[i].nodeName) {
            case 'INPUT':
                switch (form.elements[i].type) {
                    case 'text':
                    case 'tel':
                    case 'email':
                    case 'hidden':
                    case 'password':
                        ret[name] = encodeURIComponent(form.elements[i].value);
                        break;
                    case 'checkbox':
                    case 'radio':
                        ret[name] = form.elements[i].checked;
                        break;
                    case 'number':
                        ret[name] = parseFloat(form.elements[i].value);
                        break;
                }
                break;
            case 'SELECT':
            case 'TEXTAREA':
                ret[name] = encodeURIComponent(form.elements[i].value);
                break;
        }
    }
    return ret;
};

例如，这是输出：

Day: 13
Key: ""
Month: 5
OnlyPayed: true
SearchMode: "0"
Year: 2021

而不是

Day: "13"
Key: ""
Month: "5"
OnlyPayed: "true"
SearchMode: "0"
Year: "2021"

这会把一切都考虑在内

函数formToObject（表单）{let data=新FormData（表单）；let queryString=新URLSearchParams（data）.toString（）；var obj={}；var params=queryString.split（“&”）；对于（var i=0；i<params.length；i++）{var param=params[i].split（“=”）；var key=param[0].replace（“[]”，“”）；var key=密钥.替换（“%5B%5 D”，“”）；var值=参数[1]；if（obj[key]==未定义）{obj[key]=值；}else if（数组的obj[key]实例）{obj[key].push（值）；}其他{obj[key]=[obj[key]，值]；}}控制台日志（obj）返回obj；}<!DOCTYPE html><html><head><title>表单示例</title></head><body style=“height:800px；溢出：滚动”><form id=“test”onchange=“formToObject（this）”><div><h3>水果</h3><input type=“checkbox”name=“fruit”value=“apple”id=“apple“><label for=“apple”>Apfel</label><input-type=“checkbox”name=“fruit”value=“banana”id=“banana“><label for=“banana”>Banane</label><input type=“checkbox”name=“fruit”value=“cherry”id=“cherr”><label for=“cherry”>Kirsche</label><input type=“checkbox”name=“fruit”value=“葡萄”id=“葡萄”><label for=“葡萄”>Traube</label><input type=“checkbox”name=“fruit”value=“pear”id=“pear“><label for=“pear”>Birne</label></div><div><h3>多个选项</h3><select multiple name=“manyOptions[]”><option value=“选项1”>选项1</option><option value=“option 2”>选项2</option><option value=“选项3”>选项3</option></选择></div>＜div＞＜h3＞检查选项</h3><input type=“radio”name=“onceOption”value=“Option 1”>选项1<br><input type=“radio”name=“onceOption”value=“Option 2”>选项2<br><input type=“radio”name=“onceOption”value=“Option 3”>选项3<br></div></form></body></html>

const formData = new FormData(form);

let formDataJSON = {};

for (const [key, value] of formData.entries()) {

    formDataJSON[key] = value;
}