Promise封装AJAX请求

Question

控制台一直报XMLHttpRequest is not defined错误

function sendAJAX(url){
    return new Promise((resolve,reject)=>{
        const xhr = new XMLHttpRequest();
        xhr.open('GET',url);
        xhr.send();
        xhr.onreadystatechange = function(){
        if(xhr.readyState===4) {
            if(xhr.status>=200 && xhr.status<300) {
                resolve(xhr.response);
            }else {
                reject(xhr.status);
            }
        }
    }
    })
    
}
sendAJAX('https://api.uixsj.cn/hitokoto/get?type=social').then((value)=>{ 
    console.log(value.toString());
},(reason)=>{
    console.log(reason);
})

Answer 1

在js脚本中运行var xhr =  new XMLHttpRequest();

出现报错： Uncaught ReferenceError: XMLHttpRequest is not defined

报错原因：xmlhttprequest不是node 的内置对象。需要单独安装

解决办法：安装xmlhttprequest,安装命令：npm install xmlhttprequest