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封装ajax

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介绍：基于jquery的ajax封装

首先把常量Url提取出来,这里可以多存几个备用（比如测试环境和正式环境），到时候切换环境，直接打开注释，切换一下就ok了

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const Url = 'http://xxx.xxx.xxx.xxx:8080/xxx/';
//const Url = 'http://yyy.yyy.yyy.yyy:8080/yyy/';

核心代码如下：

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function Ajax(data) {
    var def = $.Deferred();
    var canceled = false;
    if (data.type == 'get') {
        var jqXHR = $.ajax({
            type: "get",
            url: Url + data.url,
            data: {},
            xhrFields: {withCredentials: true},
            crossDomain: true,
            contentType: "application/json",
            datatype: "json",
            error: function (xhr, status, error) {
                if (canceled) return;
                var data = {
                    result: 4,
                    message: error,
                    status: status
                };
                console.error("调用接口:[" + this.url + "]报错;状态码:[" + xhr.status + "];错误信息:[" + error + "]");
                def.reject(data);
            },
            success: function (data) {
                if (canceled) return;
                def.resolve(data);
            }
        });
    } else if (data.type == 'post') {
        var saveData = JSON.stringify(data.data);
        var jqXHR = $.ajax({
            type: "post",
            url: Url + data.url,
            data: saveData,
            xhrFields: {withCredentials: true},
            crossDomain: true,
            contentType: "application/json",
            datatype: "json",
            error: function (xhr, status, error) {
                if (canceled) return;
                var data = {
                    result: 4,
                    message: error,
                    status: status
                };
                console.error("调用接口:[" + this.url + "]报错;状态码:[" + xhr.status + "];错误信息:[" + error + "]");
                def.reject(data);
            },
            success: function (data) {
                if (canceled) return;
                def.resolve(data);
            }
        });
    }
    var promise = def.promise();
    var then = promise.then;
    var thenWrapper = function () {
        var promise = then.apply(this, arguments);
        promise.cancel = function () {
             canceled = true;
             jqXHR.abort();
         };
          promise.then = thenWrapper;
          return promise;
    };
    promise.then = thenWrapper;
    return promise;
}

get请求：

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var data = {
	'参数1'： '值1',
	'参数2'： '值2',
	'参数3'： '值3'
}
Ajax({
	type: 'get',
	url: 'xxx/xxx/xxx?' + qs(data)
}).then(function(res){
	console.log(res);
	//...
})
//URL拼接字符串
function qs(data) {
    var str = '';
    for (var k in data) {
        if (!data[k]) {
            data[k] = '';
        }
        str += k + '=' + data[k] + '&';
    }
    return str.slice(0, -1)
}

post请求：

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var data = {
	type: 'post',
	url: 'xxx/xxx/xxx',
	data: {
		'参数1'： '值1',
		'参数2'： '值2',
		'参数3'： '值3'
	}
}
Ajax(data).then(function(res){
	console.log(res);
	//...
})