How to quickly obtain Ajax communication objects

Below I will bring you an article on how to quickly obtain Ajax communication objects. Let me share it with you now and give it as a reference for everyone.

The examples are as follows:

function getXHR() {
  // 该方法用于获取Ajax通信对象
  var xhr = null;
  if (window.XMLHttpRequest != null &&
  window.XMLHttpRequest != undefined) {
  xhr = new XMLHttpRequest();
  } else {
  / 兼容早期的IE浏览器
  xhr = new ActiveXObject("Microsoft.XMLHTTP");
  }
  return xhr;
}

The above is what I compiled for everyone. I hope it will be helpful to everyone in the future.

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