前言
关于纯js的ajax请求,我之前有文章写过, /post/js_ajax_chun
, 关于CORS跨域资源共享,我也有文章写过, /post/cors_requestheaders,
但是在IE8和IE9中,cors跨域是无效的。针对这个,其实IE有个另类的CORS请求,仅仅在IE8和IE9中存在,IE10就废弃了,假如你要兼容IE8和IE9,那么这个属性就用到了。
IE8和IE9的 XDomainRequest
在IE中存在一个已经废弃了的属性XDomainRequest,这个属性在IE8和IE9中运行良好。
方法如下:
if(window.XDomainRequest){
var xdr = new XDomainRequest();
xdr.open("get", "/api/method");
xdr.onprogress = function () {
//Progress
};
xdr.ontimeout = function () {
//Timeout
};
xdr.onerror = function () {
//Error Occurred
};
xdr.onload = function() {
//success(xdr.responseText);
}
setTimeout(function () {
xdr.send();
}, 0);
}
原生js的ajax请求,
// 因为要兼容IE8和IE9,这里就不用Promise了,因为用了之后babel打包瞬间变大
// 创建请求对象
function CreateRequest() {
try {
if (window.XMLHttpRequest) {
return new XMLHttpRequest()
} else if (window.ActiveXObject) {
return new ActiveXObject('Microsoft.XMLHTTP')
}
} catch (e) {
console.log(e)
}
return null
}
// IE9及IE8不支持CORS跨域请求,针对IE9和IE8做请求兼容
function IE89Request(request) {
if (IsEmptyObject(request)) {
return
}
request.Method = request.Method == undefined ? 'GET' : request.Method
if (StringIsNullOrEmpty(request.Url)) {
return
}
if (window.XDomainRequest) {
var xdr = new XDomainRequest()
xdr.open(request.Method, request.Url)
xdr.onerror = function () {
if (request.ErrorCallback != undefined && typeof (request.ErrorCallback) == 'function') {
request.ErrorCallback('XDomainRequest error')
}
}
xdr.onload = function() {
// console.log(xdr.responseText)
try {
if (request.SuccessCallback != undefined && typeof (request.SuccessCallback) == 'function') {
var json = JSON.parse(xdr.responseText)
request.SuccessCallback(json, xdr)
}
} catch (e) {
// console.log(e, '进入请求error')
if (request.ErrorCallback != undefined && typeof (request.ErrorCallback) == 'function') {
request.ErrorCallback(e)
}
}
}
setTimeout(function () {
xdr.send(request.Data)
return xdr
}, 0)
}
}
// 数据请求函数封装
function Request (request) {
if (IsEmptyObject(request)) {
return
}
// 初始化请求属性
request.Method = request.Method == undefined ? 'GET' : request.Method
if (StringIsNullOrEmpty(request.Url)) {
return
}
// 默认异步请求
request.Async = request.Async == undefined ? true : request.Async
request.Headers = request.Headers == undefined ? {} : request.Headers
request.DataType = request.DataType == undefined ? 'json' : request.DataType
request.ContentType = request.ContentType == undefined ? 'application/x-www-form-urlencoded' : request.ContentType
request.Data = request.Data == undefined ? '' : request.Data
var xmlHttp = null
// 创建请求
xmlHttp = CreateRequest()
if (xmlHttp == null) {
return
}
// 打开请求
xmlHttp.open(request.Method, GetUrl(request.Url), request.Async)
// 设置请求头信息
xmlHttp.setRequestHeader('Accept', request.DataType)
xmlHttp.setRequestHeader('Content-Type', request.ContentType)
for (var key in request.Headers) {
xmlHttp.setRequestHeader(key, request.Headers[key])
}
// 处理请求响应返回
xmlHttp.onreadystatechange = function () {
// readyState属性用来表示请求的状态,有5个可取值,分别是:
// “0”:表示未初始化,即对象已经建立,但是尚未初始化(尚未调用open()方法);
// “1”:表示正在加载,此时对象已建立,尚未调用send()方法;
// “2”:表示请求已发送,即send()方法已调用;
// “3”:表示请求处理中;
// “4”:表示请求已完成,即数据接收完毕。
if (xmlHttp.readyState == 4) {
if (xmlHttp.status == 200) {
if (request.SuccessCallback != undefined && typeof (request.SuccessCallback) == 'function') {
var data
if (request.DataType == 'json') {
data = JSON.parse(xmlHttp.responseText)
} else if (request.DataType == 'xml') {
data = xmlHttp.responseXML
} else {
data = xmlHttp.responseText
}
request.SuccessCallback(data, xmlHttp)
}
} else {
if (request.ErrorCallback != undefined && typeof (request.ErrorCallback) == 'function') {
request.ErrorCallback(xmlHttp)
} else {
if (StringIsNullOrEmpty(xmlHttp.responseText)) {
alert(xmlHttp.status + ':' + xmlHttp.statusText)
} else {
alert(xmlHttp.responseText)
}
}
}
}
}
// 发送请求
xmlHttp.send(request.Data)
return xmlHttp
}
// POST数据请求
function PostRequest (url, data, successCallback, errorCallback, asyncs) {
var request = {}
var xmlHttp = null
request.Url = url
request.Method = 'POST'
request.Async = asyncs
request.ContentType = 'application/json; charset=utf-8'
request.Data = JSON.stringify(data)
request.SuccessCallback = function (a, b) {
request.IsCallback = true
successCallback && successCallback(a, b)
}
request.ErrorCallback = function (a) {
request.IsErrorCallback = true
errorCallback && errorCallback(a)
}
if (IEVersion() == 8 || IEVersion() == 9) {
xmlHttp = IE89Request(request)
} else {
xmlHttp = Request(request)
}
return xmlHttp
}
请求示例封装
export function api_haoroomsData(data, successCallback, errorCallback) {
return PostRequest(baseUrl + 'haorooms/haoroomsAjaxtest', data, successCallback, errorCallback)
}
调用
let params = {name:'haorooms',value:'ajaxTest'}
api_haoroomsData(params, function(res){
// 请求结果
}, funcrion(error){
// 错误结果
})
备注
上面封装中用到了一些方法,例如IEVersion(),判断IE版本,IsEmptyObject判断是否是空对象,StringIsNullOrEmpty空字符串
这里共享一下吧:
// IE浏览器版本判断
export function IEVersion() {
var userAgent = navigator.userAgent // 取得浏览器的userAgent字符串
var isIE = userAgent.indexOf('compatible') > -1 && userAgent.indexOf('MSIE') > -1 // 判断是否IE<11浏览器
var isEdge = userAgent.indexOf('Edge') > -1 && !isIE // 判断是否IE的Edge浏览器
var isIE11 = userAgent.indexOf('Trident') > -1 && userAgent.indexOf('rv:11.0') > -1
if (isIE) {
var reIE = new RegExp('MSIE (\\d+\\.\\d+);')
reIE.test(userAgent)
var fIEVersion = parseFloat(RegExp['$1'])
if (fIEVersion == 7) {
return 7
} else if (fIEVersion == 8) {
return 8
} else if (fIEVersion == 9) {
return 9
} else if (fIEVersion == 10) {
return 10
} else {
return 6// IE版本<=7
}
} else if (isEdge) {
return 'edge'// edge
} else if (isIE11) {
return 11 // IE11
} else {
return -1// 不是ie浏览器
}
}
// 是否空对象
export function IsEmptyObject (obj) {
if (obj === null || obj === undefined) {
return true
}
if (typeof (obj) == 'object' && obj.length > 0) {
return false
}
if (typeof (obj) == 'object') {
var blExists = false
for (var key in obj) {
blExists = true
break
}
return !blExists
}
return false
}
// 字符串去掉空格
export function StringTrim (str) {
return (str === undefined || str === null) ? '' : str.replace(/(^\s*)|(\s*$)/g, '').replace(/(^*)|(*$)/g, '')
}
// 字符串是否为空
export function StringIsNullOrEmpty(value) {
return (value === null || value === undefined) || StringTrim(value.toString()) == ''
}
就到这里,haorooms博客文章底部和右侧广告记得有空帮忙点击一下哦~~
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