AJAX示例javascript
<scripttype="text/javascript">java
window.οnlοad= function() {浏览器
varxhr;dom
if(window.XMLHttpRequest) {ip
//IE7+, Firefox, Chrome, Opera, Safari 浏览器执行代码 get
xhr= new XMLHttpRequest();io
}else {function
//IE6, IE5 浏览器执行代码test
xhr= new ActiveXObject("Microsoft.XMLHTTP");请求
}
xhr.open("get","testAjax.txt");
alert(xhr.readyState);
xhr.send();
xhr.onreadystatechange= function() {
alert(xhr.readyState);
if(xhr.readyState == 4 && xhr.status == 200) { //返回完整,请求成功
var res =xhr.responseText; //获取返回值
//拿到返回值后可对dom操做,局部刷新页面
alert(res);
}
}
}
</script>