XMLHttpRequest对象
function ajaxJson(url,type){
var promise = new Promise(function(resolve,reject){
var handle = function(){
if(this.readyState !== 4){
return;
}
if(this.status == 200){
resolve(this.response)
}else{
reject(new Error(this.statusText));
}
}
var client = new XMLHttpRequest();
client.onreadyStatusChange = handle;
client.open(url,type);
client.responseType = "json";
client.send();
})
return promise;
}
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