原生js ajax封装post，get方法-蒲公英云

原生js ajax封装post，get方法

冷不防 2022-09-08 11:49 310阅读 0赞

方法一：

function ajax(method, url, callback, data, flag) {
    var xhr;
    flag = flag || true;
    method = method.toUpperCase();
    if (window.XMLHttpRequest) {
        xhr = new XMLHttpRequest();
    } else {
        xhr = new ActiveXObject('Microsoft.XMLHttp');
    }
    xhr.onreadystatechange = function () {
        if (xhr.readyState == 4 && xhr.status == 200) {
            console.log(2)
            callback(xhr.responseText);
        }
    }
    if (method == 'GET') {
        var date = new Date(),
        timer = date.getTime();
        xhr.open('GET', url + '?' + data + '&timer' + timer, flag);
        xhr.send()
        } else if (method == 'POST') {
        xhr.open('POST', url, flag);
        xhr.setRequestHeader('Content-Type', 'application/x-www-form-urlencoded');
        xhr.send(data);
    }
}

方法二：

function serialize(data){//对发送数据的序列化
    if(!data) return '';
    var pairs=[];
    for(var name in data){
if(!data.hasOwnProperty(name)) continue;//排除嵌套对象
    if(typeof data[name]==='function') continue;//排除操作数是函数
    var value=data[name].toString();
    //encodeURIComponent对同一资源表示符（URI）编码,
    name=encodeURIComponent(name);
    valeu=encodeURIComponent(value);
    pairs.push(name+'='+value);
    }
    return pairs.join('&');
}
//get方法封装
function get(url,options,callback){
    if(window.XMLHttpRequest){
        var xhr=new XMLHttpRequest();
    }else if(window.ActiveXobject){//兼容IE7及以前版本
        var xhr=new ActiveXobject('Microft.XMLHttp');
    }
    xhr.onreadystatechange=function(callback){
     if(xhr.readyState==4){//请求结束时，readyState状态为4                            
     if((xhr.status>=200&&xhr.status<300)||xhr.status==304){
                callback(xhr.responseText);
            }else{
                console.log('连接失败:'+xhr.status);
            }
        }
    }
    // http://localhost:8000/information?name=zhou&age=18
    url=url+'?'+serialize(options);
    xhr.open('get',url,true);//开启请求，readyState状态为1
    xhr.send(null);//正式像服务器发送请求，readyState状态为2
}
//post方法封装
function post(url,options,callback){
    if(window.XMLHttpRequest){
        var xhr=new XMLHttpRequest();
    }else if(window.ActiveXobject){//兼容IE7及以前版本
        var xhr=new ActiveXobject('Microft.XMLHttp');
    }
    xhr.onreadystatechange=function(callback){
     if(xhr.readyState==4){//请求结束时，readyState状态为4
     if((xhr.status>=200&&xhr.status<300)||xhr.status==304){
                callback(xhr.responseText);
            }else{
                console.log('POST请求连接失败:'+xhr.status);
            }
        }
    }
    xhr.open('post',url,true);//开启请求，readyState状态为1
    xhr.send(serialize(options));//正式像服务器发送请求，readyState状态为2
}
post('/information',{name:'zhou',age:18},function(data){
    console.log(data);
});
get('/information',{name:'zhou',age:18},function(data){
    console.log(data);
});

异步加载javascript：

function loadScript(url, callback) {
    var oscript = document.createElement('script');
    if (oscript.readyState) { // ie8及以下版本
        oscript.onreadystatechange = function () {
            if (oscript.readyState === 'complete' || oscript.readyState === 'loaded') {
                callback();
            }
        }
    } else {
        oscript.onload = function () {
            callback()
        };
    }
    oscript.src = url;
    document.body.appendChild(oscript);
}