<!--

异步函数

setTimeout

readFile

writeFile

readdir

ajax

-->

<script>

function get(url,callback) {

var oReq = new XMLHttpRequest()

//当请求加载成功之后要调用指定的函数

oReq.onload = function () {

//我现在需要得到这里的 oReq.responseText

callback(oReq.responseText)

}

oReq.open("get",url,true)

oReq.send()

}

get('data.json',function (data) {

console.log(data)

})

</script>