maco_liao的专栏

1.给用户名文本框绑定失去焦点事件<input type="text" name="username" onblur="validateUsername()" id="username"/>2.创建XMLHttpRequest对象if (window.XMLHttpRequest){    xhr=new XMLHttpRequest();}else if (wind...

select_city.jsp页面代码：<script>    //json语法表示对象和数组,可以打开浏览器，按下F12然后打开console控制台访问这些对象和数组    var tala={"name":"tala","age":18,"address":"guangzhou"};        var people=[{"name":&quo