ajax提交方式函数封装

ajax提交方式函数封装

export{
    ajax
}
function ajax(){
    new Ajax(...arguments)
}
class Ajax{
    constructor({method,url,data}){
        this.method = method;
        this.url = url;
        this.data = data;
        this.init();
        this.type()
    }
    init(){
        var xhr= null;
        try{
            xhr = new XMLHttpRequest;
        }catch{
            xhr = new ActiveXObject("Microsoft.XMLHTTP");
        }
        return xhr;
    }
    type(){
        var xhr = this.init();
        var querystring=""
        if(this.data){
             querystring = this.queryString(this.data);
        }
        if(this.method =="get"){
            xhr.open(this.method,this.url+"?"+ querystring,true);
            xhr.send()
        }else{
            xhr.open(this.method,this.url,true);
            xhr.setRequestHeader("content-type", "application/x-www-form-urlencoded");
            xhr.send(querystring)
        }
        xhr.onreadystatechange=function(){
            if(xhr.readyState==4){
                console.log(xhr.responseText)
            }
        }
    }
    queryString(dataObj){
        var str = "";
        for(var attr in dataObj){
            str +=`${attr}=${dataObj[attr]}&`
        }
        return str.substring(0,str.length-1);
    }
}