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下面小编就为大家带来一篇用JS写的一个Ajax库(实例代码)。小编觉得挺不错的，现在就分享给大家，也给大家做个参考。一起跟随小编过来看看吧
myajax是一个用js编写的一个跨浏览器的ajax库，支持get, post, jsonp请求，精巧，简单。
一、发送GET请求：
myajax.get({
<span style="white-space:pre"> </span>data: {}, //参数
url: "", //请求地址
//发生错误是调用
error: function(data) {
},
//请求成功调用
success: function(data){
<span style="white-space:pre"> </span>//eval(data); 将字符串转换成json
}
});
二、发送POST请求：
myajax.post({
data: {}, //参数
url: "", //
//发生错误是调用
error: function(data) {
},
//请求成功调用
success: function(data){
//eval(data); 将字符串转换成json
}
});
三、发送JSONP请求：
myajax.getJSONP({
//参数
data: {
},
url: "", //请求地址
//请求成功调用
success: function(data) {
},
//发生错误时调用
error: function() {
}
});
源码：
var myajax = {
post: function(params){
var xmlhttp = this.createXMLHttpRequest();
if (xmlhttp != null)
{
var async = true;
if (typeof params.async != "undefined")
async = params.async;
var data = null;
if (typeof params.data != "undefined")
data = params.data;
var url = "";
if (typeof params.url != "undefined")
url = params.url;
if (url == null || url.length == 0)
return;
xmlhttp.open("POST", url, async);
if (async){
xmlhttp.onreadystatechange = function(){
if (this.readyState==4){
if (this.status==200){
if (typeof params.success != "undefined") {
params.success(xmlhttp.responseText);
}
}
else {
if (typeof params.error != "undefined") {
params.error(xmlhttp.status + xmlhttp.statusText);
}
console.error(url + ": " + xmlhttp.status);
}
}
};
}
xmlhttp.setRequestHeader("Content-Type", "application/x-www-form-urlencoded");
var param = "";
for (var prop in data) {
param += prop + "=" + data[prop] + "&";
}
param = param.substring(0, param.length - 1);
xmlhttp.send(param);
if (!async) {
if (xmlhttp.readyState == 4 && xmlhttp.status == 200)
if (typeof params.success != "undefined") {
params.success(xmlhttp.responseText);
}
else {
if (typeof params.error != "undefined") {
params.error(xmlhttp.status + xmlhttp.statusText);
}
console.error(url + ": " + xmlhttp.status);
}
}
}
},
get: function(params){
var xmlhttp = this.createXMLHttpRequest();
if (xmlhttp != null)
{
var async = true;
if (params.async != undefined)
async = params.async;
var url = "";
if (params.url != undefined)
url = params.url;
if (url == null || url.length == 0)
return;
if (params.data != null) {
var data = params.data;
var paramPrefix = url.indexOf("?") == -1 ? "?" : "&";
url = url + paramPrefix;
for (var prop in data) {
url += prop + "=" + data[prop] + "&";
}
url = url.substring(0, url.length - 1);
}
xmlhttp.open("GET", url, async);
if (async){
xmlhttp.onreadystatechange = function(){
if (this.readyState==4){
if (this.status==200){
if (typeof params.success != "undefined") {
params.success(xmlhttp.responseText);
}
}
else {
if (typeof params.error != "undefined") {
params.error(xmlhttp.status + xmlhttp.statusText);
}
console.error(url + ": " + xmlhttp.status);
}
}
};
}
xmlhttp.send(null);
if (!async) {
if (xmlhttp.readyState == 4 && xmlhttp.status == 200)
if (typeof params.success != "undefined") {
params.success(xmlhttp.responseText);
}
else {
if (typeof params.error != "undefined") {
params.error(xmlhttp.status + xmlhttp.statusText);
}
console.error(url + ": " + xmlhttp.status);
}
}
}
},
createXMLHttpRequest: function(){
if (window.XMLHttpRequest)
{
return new XMLHttpRequest();
}
else if (window.ActiveXObject)
{
//code for IE5 and IE6
return new ActiveXObject("Microsoft.XMLHTTP");
}
return null;
},
getJSONP: function(params) {
var url = null;
if (typeof params.url != "undefined") {
url = params.url;
}
if (url == null) {
return;
}
var ff = "" + new Date().getTime() + (parseInt(Math.random() * 10000000000));
eval("jsonpCallback_" + ff + "=" + function(data){
if (typeof params.success != "undefined") {
params.success(data);
}
});
//根据url中是否出现过 "?" 来决定添加时间戳参数时使用 "?" 还是 "&"
var paramPrefix = url.indexOf("?") == -1 ? "?" : "&";
url = url + paramPrefix + "jsonpCallback=" + "jsonpCallback_" + ff;
var param = "";
if (typeof params.data != "undefined" && params.data != null) {
var data = params.data;
for (var prop in data) {
param += prop + "=" + data[prop] + "&";
}
param = param.substring(0, param.length - 1);
}
if (param.length > 0)
url = url + "&" + param;
var script = document.createElement("script");
document.body.appendChild(script);
script.src = url;
script.charset ="UTF-8";
// for firefox, google etc.
script.onerror = function() {
if (typeof params.error != "undefined") {
params.error();
}
}
script.onload = function() {
document.body.removeChild(script);
}
// for ie
script.onreadystatechange = function() {
if (this.readyState == "loaded" || this.readyState == "complete") {
document.body.removeChild(script);
}
}
}
};
以上这篇用JS写的一个Ajax库(实例代码)就是小编分享给大家的全部内容了，希望能给大家一个参考，也希望大家多多支持脚本之家。 | 
发表于 2018-12-25 04:37:32
