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wifi認證開發過程所用到的，源碼如下：

注：檢測AC是否放行成功，是否可以訪問公網阿裡雲服務器

功能調用：

checkNet().then(function(res) {
  if(res) {
    //連網成功    
  }
  } else {
    //連網失敗        
  }
})

功能代碼：

(function() {
  //檢測入口
  checkNet = function() {
    var def = $.Deferred();
    xiuNet(null).then(function(res) {
      netWork(null).then(function(res) {
        if(res) {
          def.resolve(true);
        } else {
          def.resolve(false);
        }
      })
    })
    return def.promise();
  }
  //嗅探網絡，解決ios彈框接入網絡問題
  var checkTime = 2; //嗅探次數
  xiuNet = function(def) {
    if(def == null) {def = $.Deferred();}
    var iframe = document.createElement("iframe");
    iframe.style.cssText = "display:none;width:0px;height:0px;";
    document.body.appendChild(iframe);
    var ua = navigator.userAgent;
    if(ua.indexOf("iPhone") != -1 || ua.indexOf("iPod") != -1 ||
      ua.indexOf("iPad") != -1) {
      iframe.src = "http://www.baidu.com" + "?timestap=" + new Date().getTime();
      console.info("嗅探網絡----");
      if(checkTime > 1) {
        checkTime--;
        setTimeout(function() {
          xiuNet(def)
        }, 1000);
      } else {
        def.resolve(true);
      }
    } else {
      def.resolve(false);
    }
    return def.promise();
  }
  //檢測網絡，是否可以連接公網
  var cnetTime = 3; //檢測網絡次數
  netWork = function(def) {
    if(def == null) {def = $.Deferred();}
    $.ajax({
      type: "get",
      timeout: 2000,
      dataType: "jsonp",
      jsonp: "callback",
      url: 'https://jktv.tv/shphone/ver.txt',
      success: function(data) {},
      error: function(xhr) {
        $("#ddd").html("status:"+xhr.status)
        if(xhr.readyState == 4 && xhr.status == 200) {
          def.resolve(true);
        } else {
          if(cnetTime > 1) {
            cnetTime--;
            setTimeout(function() {
              netWork(def)
            }, 200);
          } else {
            def.resolve(false);
          }
        }
      }
    });
    return def.promise();
  }
})();