<script>
let $ = { get(url, success) { this.ajax({url, success }) },
//花括号是解构
ajax({ type, url, async, success }) {let ajax = new XMLHttpRequest()
//||的意思是为空则默认值
ajax.open(type || 'GET', url, async || true)ajax.send() ajax.onreadystatechange = () =>
{ if (ajax.readyState === 4)
{ if (ajax.status === 200)
{ success(JSON.parse(ajax.response)) } } } } }
$.get("/a.json", function ({name,age}) { console.log('打印', name,age); })
</script>
