通过 promise 对象实现ajax请求失败，并抛出错误

Question

问题描述:想通过promise对象来实现ajax数据请求//getDate.json{"name":"zzz","age":22,"say":"hellozzz"}//demo.jsletgetJson=url=>{letpromise=newPromise((resolve,reject)=>{letxhr=newXMLHttpRequest();xhr.open("GET",url,true);xhr.onreadystatechange=()=>{if(this.readyState!==4){return;}if(this.status==200){resolve(this.response);}else{reject(newError(this.statusText))}}xhr.responseType='json';xhr.setRequestHeader('Accept','application/json');xhr.send(null);});returnpromise;};getJson("getDate.json").then((json)=>{console.log(json);},(err)=>{console.log(err)});抛出错误:(intermediatevalue)isnotaconstructor