如何创建一个Ajax
# 示例代码
var xhr = null;
if (window.XMLHttpRequest) {
// 兼容 IE7+, Firefox, Chrome, Opera, Safari
xhr = new XMLHttpRequest();
} else {
// 兼容 IE6, IE5
xhr = new ActiveXObject("Microsoft.XMLHTTP");
}
xhr.open("POST","test.html",true);
xhr.setRequestHeader("Content-type","application/x-www-form-urlencoded");
xhr.send("fname=Henry&lname=Ford"); //post请求参数放在send里面，即请求体
xhr.onreadystatechange = function () {
if (xhr.readyState == 4 && xhr.status == 200) {
document.getElementById("myDiv").innerHTML = xhr.responseText;
}
};
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