Detailed explanation of examples of Ajax encapsulation in js

// 1、封裝AJAX函數function nativeAjax(option,success,error){// 定义domain,方便环境切换var domain='https://' + window.location.host + '/';var url=domain+option.urlStr;var type=option.ajaxType;var data=option.ajaxData;var xhrRequest=null;if(window.XMLHttpRequest){
        xhrRequest = new XMLHttpRequest();
    } else {
        xhrRequest = new ActiveXObject('Microsoft.XMLHTTP')
    }var str=null;
    xhrRequest.open(type,url,true);if(type==="POST"&&data!=null){
        xhrRequest.setRequestHeader("Content-type", "application/x-www-form-urlencoded;charset=utf-8");for(var key in data){
            str+='&'+key+'='+data[key];
            str=str.slice(1);
        }
    }
    xhrRequest.onreadystatechange=function(){if(xhrRequest.readyState==4){if(xhrRequest.status==200){// 1.1、格式化返回的数据var responseData=JSON.parse(xhrRequest.responseText);// 1.2、这里操作数据--------                success(responseData);
            }else{// 1.3、没成功返回HTTP状态码                error(xhrRequest.status);
            }
        }
    }
    xhrRequest.send(str);
}// 2、POST：定義請求參數var postOption={
    ajaxType:"POST",
    urlStr:"v2/html/broke/get_broke_ranked_info",
    ajaxData:{                                        "HTTP_USER_TOKEN":token,"HTTP_USER_UID":pfid, "anchor_pfid":anchor_pfid,"broke_pfid":pfid,"date":date
    }
}// 3、调用AJAXnativeAjax(postOption,function(data){// 3.1、请求成功回调    console.log(data);
},function(error){// 3.2、请求失败回调,返回HTTP状态码    console.log(error);
});//4、GET：定义请求参数var getOption={
    ajaxType:"GET",    
    urlStr:"v2/html/broke/get_broke_ranked_info",
    ajaxData:null        }
Ajax(getOption,function(data){// 成功函数    console.log(data);
},function(error){// 失败返回HTTP状态码    console.log(error);

});// 使用说明// 一、option必须option={//1、ajaxType必须："GET"或者"POST"ajaxType:"",//2、urlStr必须："string类型"urlStr:"",//3、必须：POST时候为object{key:value}，GET的时候直接为：nullajaxData:null}// 二、success请求成功回调必须// 三：error请求失败回调必须