基于promise的ajax封装
//调用方式:
/*
ajaxPrmomise({
url:,
method:,
headers:{}
}).then(res=>{})
*/ ;(function(window){
//设置默认的参数配置项
let _default = {
url:'',
baseURL:'',
method:'GET',
params:null, //get请求基于问号传参方式传递给服务器的内容
headers:{},
timeout:500,
dataType:'json',
data:null, //post请求基于请求主体传参方式传递给服务器的内容
cache:true //是否缓存数据
};
//resolve,reject,response,fn
let _setResponseMsg = function _setResponseMsg(...rest){
let [
resolve,
reject,
xhr,
fn
] = rest,
res = null,
response = xhr;
res.data = fn(response.responseText);
res.status = response.status;
res.statusText = response.statusText;
res.xhr = response;
res.headers = response.getAllResponseHeaders();
resolve(res)
} let _convertJSON = function _convertJSON(result){
let data = "";
try {
data = JSON.parse(result);
} catch (e) {
reject(e)
}
return data
} let _convertString = function _convertString(result){
return result;
} let _array_to_str = function _array_to_str(key,arr){
let params = "";
for(let i0;i<arr.length;i++){
params += `${key}=${arr[i]}&`;
}
return params.slice(0,-1)
} let _convertParams = function _convertParams(cache,params){
let str = "?",
time_str = cache ? "":(+(new Date())+"");
if(typeof params == 'object' && Object.keys(params).length > 0){
for(let key in params){
if(typeof params[key] == 'object' && (length in params[key])){
str += _array_to_str(key,params[key])
}
str += `${key}=${params[key]}`;
}
}
return str+"&_="+time_str;
} let _setHeader = function _setHeader(...res){
let [xhr,headers] = res;
for(let key in headers){
if(headers.hasOwnProperty(key))
xhr.setRequestHeader(key,headers[key])
}
} //基于promise管理ajax请求
let ajaxPrmomise = function ajaxPrmomise(options={}){
// 这里传递的options包含默认配置信息和用户基于暴露的_default修改后的信息
for(let key in _default){
if(key in options && _default.hasOwnProperty(key)){
options[key] = _default[key]
}
}
//=>这里可以写成
options = {..._default,...options};
let {
url,
method,
baseURL,
data,
dataType,
headers,
cache,
params
} = options;
let xhr,send_data; return new Promise((resolve,reject)=>{
xhr = new XMLHttpRequest();
_setHeader(xhr,headers);
send_data = method.toLowerCase() == 'get' ? _convertParams(cache,params):(method.toLowerCase() == 'post'? data:"");
all_url = baseURL + url + send_data;
xhr.open(method,all_url);
xhr.onreadystatechange = function(){
if(xhr.readyState == 4){
if(/^[23]\d{2}$/.test(xhr.status)){
dataType = dataType.toUpperCase();
if(dataType == "json")
_setResponseMsg(resolve,reject,xhr,_convertJSON)
_setResponseMsg(resolve,reject,xhr,_convertString)
}
}
}
ajaxPrmomise.xhr = xhr;
xhr.send(send_data);
})
}
//修改默认配置，可以通过自己设置一些配置来覆盖默认配置
ajaxPrmomise.defaults = _default; ["get","head","options",""].forEach((method,indexs)=>{
ajaxPrmomise[method] = function(url,options){
return ajaxPrmomise({
...options,
url:url,
method:method
})
}
});
["post","put"].forEach((method,index)=>{
ajaxPrmomise[method] = function(url,data,options){
return ajaxPrmomise({
...options,
url:url,
data:data,
method:method
})
}
})
window.ajaxPrmomise = ajaxPrmomise;
}(window))
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