<div id="form">
  <select id='select1'>
   <option value="">--请选择--</option>
   <option value="1">--1--</option>
   <option value="2">--2--</option>
   <option value="3">--3--</option>
  </select>
  <input id='radio1' type="radio" />
  <input id='text1' type="text" />
  <textarea id='textArea1' ></textarea>
</div>

function getEntity(){
  return {
    select1:$("#select1").val(),
    radio1:$("#radio1").prop('checked'),
    text1:$("text1").val(),
    textArea1:$("textArea1").val()
  }
}

<div id="form">
    <select data-field='select1'>
     <option value="">--请选择--</option>
     <option value="1">--1--</option>
     <option value="2">--2--</option>
     <option value="3">--3--</option>
    </select>
    <input data-field='radio1' type="radio" />
    <input data-field='text1' type="text" />
    <textarea data-field='textArea1'></textarea>
 </div>

function getEntity(form) {
   var result = {};
   $(form).find("[data-field]").each(function() {
     var field = $(this).attr("data-field");
     var val;
 
     if ($(this).attr('type') == 'checkbox') {
       val = $(this).prop('checked');
     } else if ($(this).attr('type') == 'radio') {
       val = $(this).prop('checked');
     } else {
       val = $(this).val();
     }
     // 获取单个属性的值,并扩展到result对象里面
     getField(field.split('.'), val, result);
   });
   return result;
 }

function getField(fieldNames, value, result) {
  if (fieldNames.length > 1) {
    for (var i = 0; i < fieldNames.length - 1; i++) {
      if (result[fieldNames[i]] == undefined) {
        result[fieldNames[i]] = {}
      }
      result = result[fieldNames[i]];
    }
    result[fieldNames[fieldNames.length - 1]] = value;
  } else {
    result[fieldNames[0]] = value;
  }
}

<div id="form">
    <select data-field='Person.Job'>
     <option value="">--职位--</option>
     <option value="java工程师">java工程师</option>
     <option value="net工程师">.net工程师</option>
     <option value="python工程师">python工程师</option>
    </select>
    <input data-field='Person.Desc' type="text" />
  </div>

function setEntity(form, entity) {
  $(form).find("[data-field]").each(function() {
    var field = $(this).attr("data-field");
    fieldNames = field.split('.');
    var value = JSON.parse(JSON.stringify(entity));
    for (var index = 0; index < fieldNames.length; index++) {
      value = value[fieldNames[index]];
      if (!value) {
        break;
      }
    }
    if ($(this).attr("type") === "checkbox" ||
      $(this).attr("type") === "radio") {
      $(this).attr('checked', Boolean(value));
    } else {
      if (value) {
        $(this).val(value);
      } else {
        $(this).val("");
      }
    }
  })
}