手写ajax

var request = new XMLHttpRequest()  //创建XML对象

request.open('GET',url);  //设置发送方式和请求文本的地址

request.onreadystatechange = function(){

  if(request.readyState === 4 && request.status === 200){

    console.log("请求成功")

  });

}

request .send()

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转载自www.cnblogs.com/zhoujingye/p/12515647.html