form转json方法

方法一：

//将表单数据转为json    function form2Json(id) {        var arr = $("#" + id).serializeArray()        var jsonStr = "";        jsonStr += '{';        for (var i = 0; i < arr.length; i++) {            jsonStr += '"' + arr[i].name + '":"' + arr[i].value + '",'        }        jsonStr = jsonStr.substring(0, (jsonStr.length - 1));        jsonStr += '}'        var json = JSON.parse(jsonStr)        return json    }

方法二：

一个github上的开源jquery项目，用来把form转成json，很好用

项目地址：

https://github.com/marioizquierdo/jquery.serializeJSON/blob/master/jquery.serializejson.js

/*!  SerializeJSON jQuery plugin.  https://github.com/marioizquierdo/jquery.serializeJSON  version 2.8.1 (Dec, 2016)  Copyright (c) 2012, 2017 Mario Izquierdo  Dual licensed under the MIT (http://www.opensource.org/licenses/mit-license.php)  and GPL (http://www.opensource.org/licenses/gpl-license.php) licenses.*/(function (factory) {  if (typeof define === 'function' && define.amd) { // AMD. Register as an anonymous module.    define(['jquery'], factory);  } else if (typeof exports === 'object') { // Node/CommonJS    var jQuery = require('jquery');    module.exports = factory(jQuery);  } else { // Browser globals (zepto supported)    factory(window.jQuery || window.Zepto || window.$); // Zepto supported on browsers as well  }}(function ($) {  "use strict";  // jQuery('form').serializeJSON()  $.fn.serializeJSON = function (options) {    var f, $form, opts, formAsArray, serializedObject, name, value, parsedValue, _obj, nameWithNoType, type, keys, skipFalsy;    f = $.serializeJSON;    $form = this; // NOTE: the set of matched elements is most likely a form, but it could also be a group of inputs    opts = f.setupOpts(options); // calculate values for options {parseNumbers, parseBoolens, parseNulls, ...} with defaults    // Use native `serializeArray` function to get an array of {name, value} objects.    formAsArray = $form.serializeArray();    f.readCheckboxUncheckedValues(formAsArray, opts, $form); // add objects to the array from unchecked checkboxes if needed    // Convert the formAsArray into a serializedObject with nested keys    serializedObject = {};    $.each(formAsArray, function (i, obj) {      name  = obj.name; // original input name      value = obj.value; // input value      _obj = f.extractTypeAndNameWithNoType(name);      nameWithNoType = _obj.nameWithNoType; // input name with no type (i.e. "foo:string" => "foo")      type = _obj.type; // type defined from the input name in :type colon notation      if (!type) type = f.attrFromInputWithName($form, name, 'data-value-type');      f.validateType(name, type, opts); // make sure that the type is one of the valid types if defined      if (type !== 'skip') { // ignore inputs with type 'skip'        keys = f.splitInputNameIntoKeysArray(nameWithNoType);        parsedValue = f.parseValue(value, name, type, opts); // convert to string, number, boolean, null or customType        skipFalsy = !parsedValue && f.shouldSkipFalsy($form, name, nameWithNoType, type, opts); // ignore falsy inputs if specified        if (!skipFalsy) {          f.deepSet(serializedObject, keys, parsedValue, opts);        }      }    });    return serializedObject;  };  // Use $.serializeJSON as namespace for the auxiliar functions  // and to define defaults  $.serializeJSON = {    defaultOptions: {      checkboxUncheckedValue: undefined, // to include that value for unchecked checkboxes (instead of ignoring them)      parseNumbers: false, // convert values like "1", "-2.33" to 1, -2.33      parseBooleans: false, // convert "true", "false" to true, false      parseNulls: false, // convert "null" to null      parseAll: false, // all of the above      parseWithFunction: null, // to use custom parser, a function like: function(val){ return parsed_val; }      skipFalsyValuesForTypes: [], // skip serialization of falsy values for listed value types      skipFalsyValuesForFields: [], // skip serialization of falsy values for listed field names      customTypes: {}, // override defaultTypes      defaultTypes: {        "string":  function(str) { return String(str); },        "number":  function(str) { return Number(str); },        "boolean": function(str) { var falses = ["false", "null", "undefined", "", "0"]; return falses.indexOf(str) === -1; },        "null":    function(str) { var falses = ["false", "null", "undefined", "", "0"]; return falses.indexOf(str) === -1 ? str : null; },        "array":   function(str) { return JSON.parse(str); },        "object":  function(str) { return JSON.parse(str); },        "auto":    function(str) { return $.serializeJSON.parseValue(str, null, null, {parseNumbers: true, parseBooleans: true, parseNulls: true}); }, // try again with something like "parseAll"        "skip":    null // skip is a special type that makes it easy to ignore elements      },      useIntKeysAsArrayIndex: false // name="foo[2]" value="v" => {foo: [null, null, "v"]}, instead of {foo: ["2": "v"]}    },    // Merge option defaults into the options    setupOpts: function(options) {      var opt, validOpts, defaultOptions, optWithDefault, parseAll, f;      f = $.serializeJSON;      if (options == null) { options = {}; }   // options ||= {}      defaultOptions = f.defaultOptions || {}; // defaultOptions      // Make sure that the user didn't misspell an option      validOpts = ['checkboxUncheckedValue', 'parseNumbers', 'parseBooleans', 'parseNulls', 'parseAll', 'parseWithFunction', 'skipFalsyValuesForTypes', 'skipFalsyValuesForFields', 'customTypes', 'defaultTypes', 'useIntKeysAsArrayIndex']; // re-define because the user may override the defaultOptions      for (opt in options) {        if (validOpts.indexOf(opt) === -1) {          throw new  Error("serializeJSON ERROR: invalid option '" + opt + "'. Please use one of " + validOpts.join(', '));        }      }      // Helper to get the default value for this option if none is specified by the user      optWithDefault = function(key) { return (options[key] !== false) && (options[key] !== '') && (options[key] || defaultOptions[key]); };      // Return computed options (opts to be used in the rest of the script)      parseAll = optWithDefault('parseAll');      return {        checkboxUncheckedValue:    optWithDefault('checkboxUncheckedValue'),        parseNumbers:  parseAll || optWithDefault('parseNumbers'),        parseBooleans: parseAll || optWithDefault('parseBooleans'),        parseNulls:    parseAll || optWithDefault('parseNulls'),        parseWithFunction:         optWithDefault('parseWithFunction'),        skipFalsyValuesForTypes:   optWithDefault('skipFalsyValuesForTypes'),        skipFalsyValuesForFields:  optWithDefault('skipFalsyValuesForFields'),        typeFunctions: $.extend({}, optWithDefault('defaultTypes'), optWithDefault('customTypes')),        useIntKeysAsArrayIndex: optWithDefault('useIntKeysAsArrayIndex')      };    },    // Given a string, apply the type or the relevant "parse" options, to return the parsed value    parseValue: function(valStr, inputName, type, opts) {      var f, parsedVal;      f = $.serializeJSON;      parsedVal = valStr; // if no parsing is needed, the returned value will be the same      if (opts.typeFunctions && type && opts.typeFunctions[type]) { // use a type if available        parsedVal = opts.typeFunctions[type](valStr);      } else if (opts.parseNumbers  && f.isNumeric(valStr)) { // auto: number        parsedVal = Number(valStr);      } else if (opts.parseBooleans && (valStr === "true" || valStr === "false")) { // auto: boolean        parsedVal = (valStr === "true");      } else if (opts.parseNulls    && valStr == "null") { // auto: null        parsedVal = null;      }      if (opts.parseWithFunction && !type) { // custom parse function (apply after previous parsing options, but not if there's a specific type)        parsedVal = opts.parseWithFunction(parsedVal, inputName);      }      return parsedVal;    },    isObject:          function(obj) { return obj === Object(obj); }, // is it an Object?    isUndefined:       function(obj) { return obj === void 0; }, // safe check for undefined values    isValidArrayIndex: function(val) { return /^[0-9]+$/.test(String(val)); }, // 1,2,3,4 ... are valid array indexes    isNumeric:         function(obj) { return obj - parseFloat(obj) >= 0; }, // taken from jQuery.isNumeric implementation. Not using jQuery.isNumeric to support old jQuery and Zepto versions    optionKeys: function(obj) { if (Object.keys) { return Object.keys(obj); } else { var key, keys = []; for(key in obj){ keys.push(key); } return keys;} }, // polyfill Object.keys to get option keys in IE<9    // Fill the formAsArray object with values for the unchecked checkbox inputs,    // using the same format as the jquery.serializeArray function.    // The value of the unchecked values is determined from the opts.checkboxUncheckedValue    // and/or the data-unchecked-value attribute of the inputs.    readCheckboxUncheckedValues: function (formAsArray, opts, $form) {      var selector, $uncheckedCheckboxes, $el, uncheckedValue, f, name;      if (opts == null) { opts = {}; }      f = $.serializeJSON;      selector = 'input[type=checkbox][name]:not(:checked):not([disabled])';      $uncheckedCheckboxes = $form.find(selector).add($form.filter(selector));      $uncheckedCheckboxes.each(function (i, el) {        // Check data attr first, then the option        $el = $(el);        uncheckedValue = $el.attr('data-unchecked-value');        if (uncheckedValue == null) {          uncheckedValue = opts.checkboxUncheckedValue;        }        // If there's an uncheckedValue, push it into the serialized formAsArray        if (uncheckedValue != null) {          if (el.name && el.name.indexOf("[][") !== -1) { // identify a non-supported            throw new Error("serializeJSON ERROR: checkbox unchecked values are not supported on nested arrays of objects like '"+el.name+"'. See https://github.com/marioizquierdo/jquery.serializeJSON/issues/67");          }          formAsArray.push({name: el.name, value: uncheckedValue});        }      });    },    // Returns and object with properties {name_without_type, type} from a given name.    // The type is null if none specified. Example:    //   "foo"           =>  {nameWithNoType: "foo",      type:  null}    //   "foo:boolean"   =>  {nameWithNoType: "foo",      type: "boolean"}    //   "foo[bar]:null" =>  {nameWithNoType: "foo[bar]", type: "null"}    extractTypeAndNameWithNoType: function(name) {      var match;      if (match = name.match(/(.*):([^:]+)$/)) {        return {nameWithNoType: match[1], type: match[2]};      } else {        return {nameWithNoType: name, type: null};      }    },    // Check if this input should be skipped when it has a falsy value,    // depending on the options to skip values by name or type, and the data-skip-falsy attribute.    shouldSkipFalsy: function($form, name, nameWithNoType, type, opts) {      var f = $.serializeJSON;            var skipFromDataAttr = f.attrFromInputWithName($form, name, 'data-skip-falsy');      if (skipFromDataAttr != null) {        return skipFromDataAttr !== 'false'; // any value is true, except if explicitly using 'false'       }      var optForFields = opts.skipFalsyValuesForFields;      if (optForFields && (optForFields.indexOf(nameWithNoType) !== -1 || optForFields.indexOf(name) !== -1)) {        return true;      }            var optForTypes = opts.skipFalsyValuesForTypes;      if (type == null) type = 'string'; // assume fields with no type are targeted as string      if (optForTypes && optForTypes.indexOf(type) !== -1) {        return true      }      return false;    },    // Finds the first input in $form with this name, and get the given attr from it.    // Returns undefined if no input or no attribute was found.    attrFromInputWithName: function($form, name, attrName) {      var escapedName, selector, $input, attrValue;      escapedName = name.replace(/(:|\.|\[|\]|\s)/g,'\\$1'); // every non-standard character need to be escaped by \\      selector = '[name="' + escapedName + '"]';      $input = $form.find(selector).add($form.filter(selector)); // NOTE: this returns only the first $input element if multiple are matched with the same name (i.e. an "array[]"). So, arrays with different element types specified through the data-value-type attr is not supported.      return $input.attr(attrName);    },    // Raise an error if the type is not recognized.    validateType: function(name, type, opts) {      var validTypes, f;      f = $.serializeJSON;      validTypes = f.optionKeys(opts ? opts.typeFunctions : f.defaultOptions.defaultTypes);      if (!type || validTypes.indexOf(type) !== -1) {        return true;      } else {        throw new Error("serializeJSON ERROR: Invalid type " + type + " found in input name '" + name + "', please use one of " + validTypes.join(', '));      }    },    // Split the input name in programatically readable keys.    // Examples:    // "foo"              => ['foo']    // "[foo]"            => ['foo']    // "foo[inn][bar]"    => ['foo', 'inn', 'bar']    // "foo[inn[bar]]"    => ['foo', 'inn', 'bar']    // "foo[inn][arr][0]" => ['foo', 'inn', 'arr', '0']    // "arr[][val]"       => ['arr', '', 'val']    splitInputNameIntoKeysArray: function(nameWithNoType) {      var keys, f;      f = $.serializeJSON;      keys = nameWithNoType.split('['); // split string into array      keys = $.map(keys, function (key) { return key.replace(/\]/g, ''); }); // remove closing brackets      if (keys[0] === '') { keys.shift(); } // ensure no opening bracket ("[foo][inn]" should be same as "foo[inn]")      return keys;    },    // Set a value in an object or array, using multiple keys to set in a nested object or array:    //    // deepSet(obj, ['foo'], v)               // obj['foo'] = v    // deepSet(obj, ['foo', 'inn'], v)        // obj['foo']['inn'] = v // Create the inner obj['foo'] object, if needed    // deepSet(obj, ['foo', 'inn', '123'], v) // obj['foo']['arr']['123'] = v //    //    // deepSet(obj, ['0'], v)                                   // obj['0'] = v    // deepSet(arr, ['0'], v, {useIntKeysAsArrayIndex: true})   // arr[0] = v    // deepSet(arr, [''], v)                                    // arr.push(v)    // deepSet(obj, ['arr', ''], v)                             // obj['arr'].push(v)    //    // arr = [];    // deepSet(arr, ['', v]          // arr => [v]    // deepSet(arr, ['', 'foo'], v)  // arr => [v, {foo: v}]    // deepSet(arr, ['', 'bar'], v)  // arr => [v, {foo: v, bar: v}]    // deepSet(arr, ['', 'bar'], v)  // arr => [v, {foo: v, bar: v}, {bar: v}]    //    deepSet: function (o, keys, value, opts) {      var key, nextKey, tail, lastIdx, lastVal, f;      if (opts == null) { opts = {}; }      f = $.serializeJSON;      if (f.isUndefined(o)) { throw new Error("ArgumentError: param 'o' expected to be an object or array, found undefined"); }      if (!keys || keys.length === 0) { throw new Error("ArgumentError: param 'keys' expected to be an array with least one element"); }      key = keys[0];      // Only one key, then it's not a deepSet, just assign the value.      if (keys.length === 1) {        if (key === '') {          o.push(value); // '' is used to push values into the array (assume o is an array)        } else {          o[key] = value; // other keys can be used as object keys or array indexes        }      // With more keys is a deepSet. Apply recursively.      } else {        nextKey = keys[1];        // '' is used to push values into the array,        // with nextKey, set the value into the same object, in object[nextKey].        // Covers the case of ['', 'foo'] and ['', 'var'] to push the object {foo, var}, and the case of nested arrays.        if (key === '') {          lastIdx = o.length - 1; // asume o is array          lastVal = o[lastIdx];          if (f.isObject(lastVal) && (f.isUndefined(lastVal[nextKey]) || keys.length > 2)) { // if nextKey is not present in the last object element, or there are more keys to deep set            key = lastIdx; // then set the new value in the same object element          } else {            key = lastIdx + 1; // otherwise, point to set the next index in the array          }        }        // '' is used to push values into the array "array[]"        if (nextKey === '') {          if (f.isUndefined(o[key]) || !$.isArray(o[key])) {            o[key] = []; // define (or override) as array to push values          }        } else {          if (opts.useIntKeysAsArrayIndex && f.isValidArrayIndex(nextKey)) { // if 1, 2, 3 ... then use an array, where nextKey is the index            if (f.isUndefined(o[key]) || !$.isArray(o[key])) {              o[key] = []; // define (or override) as array, to insert values using int keys as array indexes            }          } else { // for anything else, use an object, where nextKey is going to be the attribute name            if (f.isUndefined(o[key]) || !f.isObject(o[key])) {              o[key] = {}; // define (or override) as object, to set nested properties            }          }        }        // Recursively set the inner object        tail = keys.slice(1);        f.deepSet(o[key], tail, value, opts);      }    }  };}));