Native js encapsulation ajax compatible jsonp example sharing

This article mainly brings you an ajax example using native js encapsulation (compatible with jsonp). The editor thinks it is quite good, so I will share it with you now and give it as a reference for everyone. Let’s follow the editor to take a look, I hope it can help everyone.

Examples are as follows:

/* 封装ajax函数
 * @param {string}opt.type http连接的方式，包括POST和GET两种方式
 * @param {string}opt.url 发送请求的url
 * @param {boolean}opt.async 是否为异步请求，true为异步的，false为同步的
 * @param {object}opt.data 发送的参数，格式为对象类型
 * @param {function}opt.success ajax发送并接收成功调用的回调函数
 */
  function ajax(opt) {
    opt = opt || {};
    opt.method = opt.method.toUpperCase() || 'POST';
    opt.url = opt.url || '';
    opt.async = opt.async || true;
    opt.data = opt.data || null;
    opt.success = opt.success || function () {};
    opt.dataType = opt.dataType || "json";
    var xmlHttp = null;
    if (XMLHttpRequest) {
      xmlHttp = new XMLHttpRequest();
    }
    else {
      xmlHttp = new ActiveXObject('Microsoft.XMLHTTP');
    }var params = [];
    for (var key in opt.data){
      params.push(key + '=' + opt.data[key]);
    }
    var postData = params.join('&');
    if (opt.method.toUpperCase() === 'POST') {
      xmlHttp.open(opt.method, opt.url, opt.async);
      xmlHttp.setRequestHeader('Content-Type', 'application/x-www-form-urlencoded;charset=utf-8');
      xmlHttp.send(postData);
    }
    else if (opt.method.toUpperCase() === 'GET') {
      xmlHttp.open(opt.method, opt.url + '?' + postData, opt.async);
      xmlHttp.send(null);
    } 
    xmlHttp.onreadystatechange = function () {
      if(opt.dataType != 'jsonp'){
        if (xmlHttp.readyState == 4 && xmlHttp.status == 200) {
          opt.success(xmlHttp.responseText);
        }
      }else{
        //alert(1); 
        if (xmlHttp.readyState == 4 && xmlHttp.status == 200) {
          var oScript = document.createElement('script');
          document.body.appendChild(oScript);

          var callbackname = 'wangxiao'
          oScript.src = opt.url + "?" + postData+'&callback='+callbackname;

          window['wangxiao'] = function(data) {
            opt.success(data);
            document.body.removeChild(oScript);
          };
        }


      }

    };
  }
  export default ajax;

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