AJAX 是一种在无需重新加载整个网页的情况下，能够更新部分网页的技术。
现在大家写写了一个简单的ajax获取数据的小示例，希望能帮助需要帮助的。
html代码：
1 <table border="1" > 2 ?????<!--因为在谷歌上会自动添加tbody标签，其他浏览器不会有这标签，所以添加tbody是为了选取元素时不会发生混乱。--> 3 ??????<tbody> 4 ???????<tr> 5 ????????<th>日期</th> 6 ????????<th>最高温度</th> 7 ????????<th>最低温度</th> 8 ????????<th>天气</th> 9 ????????</tr>10 ????</tbody> ???????11 </table>
javascript代码：
<script>//创建ajax对象var xhr=new XMLHttpRequest();//监听相应xhr.onreadystatechange=function(){if(xhr.readyState==4){if(xhr.status==200){//数据获取成功//JSON.parse把数组格式的字符串转换成真正的数组var data=JSON.parse(xhr.responseText)for(var i= 0;data.length>i;i++ ){var tr= document.createElement(‘tr‘);var dateTd = document.createElement(‘td‘);dateTd.innerHTML=data[i].date;var maxTd = document.createElement(‘td‘);maxTd.innerHTML=data[i].max_temperature;var minTd = document.createElement(‘td‘);minTd.innerHTML=data[i].min_temperature;var weatherTd = document.createElement(‘td‘);weatherTd.innerHTML=data[i].weather;//将td挂上tr上tr.appendChild(dateTd);tr.appendChild(maxTd);tr.appendChild(minTd);tr.appendChild(weatherTd);document.getElementsByTagName("tbody")[0].appendChild(tr)} }else{console.log(加载失败)}}}//发送请求xhr.open("GET","weather.json","true");xhr.send(null)</script>json数据：
[{"date":"2017-12-12","max_temperature":40,"min_temperature":30,"weather":"天晴"},{"date":"2017-12-13","max_temperature":38,"min_temperature":20,"weather":"雨"},{"date":"2017-12-14","max_temperature":35,"min_temperature":25,"weather":"天晴"},{"date":"2017-12-15","max_temperature":30,"min_temperature":25,"weather":"小雨"},{"date":"2017-12-16","max_temperature":40,"min_temperature":32,"weather":"天晴"},{"date":"2017-12-17","max_temperature":25,"min_temperature":20,"weather":"阴"},{"date":"2017-12-18","max_temperature":39,"min_temperature":35,"weather":"阵雨"}]效果：
js ?ajax数据的获取小示例 ?天气信息填充表格
原文地址：http://www.cnblogs.com/pqh1458/p/8032127.html