jQuery序列化后的表单值转换成Json

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[ 
 {name: 'firstname', value: 'Hello'}, 
 {name: 'lastname', value: 'World'},
 {name: 'alias'}, // 值为空
]

$.fn.serializeObject = function()
{
 var o = {};
 var a = this.serializeArray();
 $.each(a, function() {
 if (o[this.name] !== undefined) {
  if (!o[this.name].push) {
  o[this.name] = [o[this.name]];
  }
  o[this.name].push(this.value || '');
 } else {
  o[this.name] = this.value || '';
 }
 });
 return o;
};