原生ajax方法封装

/**
 * @function ajax request
 * @fields ajaxName:请求名称，method：请求方法，url：接口地址，async：是否异步请求，withCredentials：是否支持跨域发送cookie，params：post请求参数
 * @param data:{"ajaxName":"ajaxNameString","method":"GET/POST","url":"","async":true/false,"withCredentials":true/false,"params":{}}
 * @result ajaxName.responseText
 */
function ajaxRequest(data, callback) {
    var ajax = data.ajaxName;
    // 新建请求
    ajax = new XMLHttpRequest();
    // 打开请求
    ajax.open(data.method, data.url, data.async);
    // 是否支持跨域发送cookie
    ajax.withCredentials = data.withCredentials;
    // 如果是POST请求则设置Header
    if (data.method == ‘POST‘) {
        ajax.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
    }
    // 发送请求
    ajax.send(data.params ? data.params : ‘‘);
    // 注册事件
    ajax.onreadystatechange = function () {
        callback(ajax);
    }
}

调用方法：

ajaxRequest({
    "ajaxName": ajaxName,
    "method": "POST",
    "url": "http://xxx.xxx.xxx/",
    "async": true,
    "withCredentials": true,
    "params": params
}, function callback(ajax) {
    console.log(ajax.responseText);
})