四时宝库

/*

let xml = new XMLHttpRequest();

xml.open('get','js/分页n.json');//获取json数据

xml.send();

xml.onreadystatechange = function(){

if(xml.readyState == 4 && xml.status == 200){

let text = xml.responseText;

data = JSON.parse(text);

fn();//调用函数

}

}

*/