es6标准下ajax类封装及使用_使用es6class封装ajax类

1.ajax类：

class Ajax {

constructor(xhr) {

xhr = window.XMLHttpRequest ? new XMLHttpRequest() : new ActiveXObject("Microsoft.XMLHTTP");

this.xhr = xhr;

}

 

send(options) {

let xhr = this.xhr;

 

let opt = {

type: options.type || 'POST',

url: options.url || '',

async: options.async || 'true',

dataType: options.dataType || 'json',

questring: options.questring || '',

};

 

return new Promise((resolve, reject) => {

xhr.open(opt.type,opt.url,opt.async);

 

xhr.onreadystatechange = () => {

if(xhr.readyState === 4) {

if(xhr.status === 200){

if(opt.dataType === 'json'){

const data = JSON.stringify(xhr.responseText);

resolve(data);

//console.log(data);

}

}else {

reject(new Error(xhr.status || 'Server is fail.'));

}

}

};

xhr.onerror = () => {

reject(new Error(xhr.status || 'Server is fail.'));

};

xhr.setRequestHeader("Content-Type","application/json; charset=utf-8");

xhr.send(opt.questring);

})

}

}

2.调用

let getAjax = new Ajax();

getAjax.send({

type : 'POST',

url:'http://localhost:9011/getPtest.asmx/InJsonToDT',

questring:"{'inJson':'"+data+"'}"

});

3.返回值：

clickAjax = () => {   

      ajax.send(options).then(data => {

        document.getElementById("fillin").innerHTML = data.about;

      }).catch(error => {

        console.log(error);

      });

    }