为什么我的来自 CodeIgniter 的 JSON 响应在 JavaScript 中不可读？

Question

我使用 CodeIgniter 控制器将数据存储在“响应”中，这是：

{
  "ok": false,
  "messages": {
    "cgusrnm": "<p class=\"text-danger\">The Full Name field is required.<\/p>",
    "cgnnm": "<p class=\"text-danger\">The Nick Name field is required.<\/p>",
    "cgeml": "<p class=\"text-danger\">The Email Address field is required.<\/p>",
    "cgunm": "<p class=\"text-danger\">The User Name field is required.<\/p>",
    "cgpsd": "<p class=\"text-danger\">The Password field is required.<\/p>",
    "ccgpsd": "<p class=\"text-danger\">The Confirm Password field is required.<\/p>",
    "cgcnm": "<p class=\"text-danger\">The Company Name field is required.<\/p>",
    "cgadr": "<p class=\"text-danger\">The User Address field is required.<\/p>",
    "cgct": "<p class=\"text-danger\">The City field is required.<\/p>",
    "cgcnt": "<p class=\"text-danger\">The Country field is required.<\/p>",
    "cgzn": "<p class=\"text-danger\">The State field is required.<\/p>",
    "cgzc": "<p class=\"text-danger\">The Zip Code field is required.<\/p>",
    "cgpn": "<p class=\"text-danger\">The Phone Number field is required.<\/p>",
    "cgsn": "<p class=\"text-danger\">The Skype Name field is required.<\/p>",
    "pm": "<p class=\"text-danger\">The Payment Method field is required.<\/p>",
    "cgpeml": "<p class=\"text-danger\">The Email Address field is required.<\/p>"
  }
}

但是 ajax 文件无法读取这个数组。

我的 ajax 代码：

$('#form_user').submit(function(e) {
  e.preventDefault();

  var me = $(this);

  $.ajax({
    url: me.attr('action'),
    type: 'post',
    data: me.serialize(),
    datatype: 'json',
    success: function(response) {
      if (response.ok == true) {
        alert('response');
      } else {
        $.each(response.messages, function(key, value) {
          var element = $('#' + key);
          element.after(value);
        });
      }
    }
  });
});

Answer 1

即使数据类型是 json，response 变量的类型仍然是字符串。尝试添加 response = JSON.parse(response); 以将字符串转换为 JavaScript 对象。

Answer 2

message 不是一个数组而是一个对象。 JSON 数组看起来像 {message:["a","b"]}