var httpUtils = cc.Class({
  extends: cc.Component,

  properties: {
    // foo: {
    //    default: null,      // The default value will be used only when the component attaching
    //                           to a node for the first time
    //    url: cc.Texture2D,  // optional, default is typeof default
    //    serializable: true, // optional, default is true
    //    visible: true,      // optional, default is true
    //    displayName: 'Foo', // optional
    //    readonly: false,    // optional, default is false
    // },
    // ...
  },

  statics: {
    instance: null
  },

  // use this for initialization
  onLoad: function() {},

  httpGets: function(url, callback) {
    var xhr = cc.loader.getXMLHttpRequest();
    xhr.onreadystatechange = function() {
      if (xhr.readyState == 4) {
        if (xhr.status >= 200 && xhr.status < 400) {
          var response = xhr.responseText;
          if (response) {
            // var responseJson = JSON.parse(response);
            callback(response);
          } else {
            console.log("返回数据不存在");
            callback(-1);
          }
        } else {
          console.log("请求失败");
          callback(-1);
        }
      }
    };
    xhr.open("GET", url, true);
    xhr.setRequestHeader("Content-Type", "text/plain;charset=UTF-8");
    if (cc.sys.isNative) {
      xhr.setRequestHeader("Accept-Encoding", "gzip,deflate");
    }

    // note: In Internet Explorer, the timeout property may be set only after calling the open()
    // method and before calling the send() method.
    xhr.timeout = 5000; // 5 seconds for timeout

    xhr.send();
  },

  httpPost: function(url, params, callback) {
    var xhr = cc.loader.getXMLHttpRequest();
    xhr.onreadystatechange = function() {
      if (xhr.readyState == 4) {
        if (xhr.status >= 200 && xhr.status < 400) {
          var response = xhr.responseText;
          // console.log(response)
          if (response) {
            // var responseJson = JSON.parse(response);
            callback(response);
          } else {
            console.log("返回数据不存在");
            callback(-1);
          }
        } else {
          console.log("请求失败");
          callback(-1);
        }
      }
    };
    xhr.open("POST", url, true);
    xhr.setRequestHeader("Content-Type", "text/plain;charset=UTF-8");
    if (cc.sys.isNative) {
      xhr.setRequestHeader("Accept-Encoding", "gzip,deflate");
    }

    // note: In Internet Explorer, the timeout property may be set only after calling the open()
    // method and before calling the send() method.
    xhr.timeout = 5000; // 5 seconds for timeout

    xhr.send(params);
  }
});

httpUtils.getInstance = function() {
  if (httpUtils.instance == null) {
    httpUtils.instance = new httpUtils();
  }
  return httpUtils.instance;
};