How to quickly obtain Ajax communication objects

This time I will show you how to quickly obtain Ajax communication objects, and what are the precautions for obtaining Ajax communication objects. The following is a practical case, let's take a look.

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;
}

I believe you have mastered the method after reading the case in this article. For more exciting information, please pay attention to other related articles on the PHP Chinese website !

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