创建xhr
var xhr = null;
if (window.XMLHttpRequest) {//dom
xhr = new XMLHttpRequest();
} else {//ie
xhr = new ActiveXObject("Microsoft.XMLHTTP");
}
打开链接
- type:POST(大量数据)
GET（通过url传递数据）
- url
- async:true异步，false同步
xhr.open("GET", "newPage.html", true);
绑定回调函数：发送成功之后触发
xhr.setRequestHeader("Content-Type", "application/x-www-form-
urlencoded");//
xhr.open("POST", "newPage.html", true);
xhr.onreadystatechange = function() {
console.info(xhr.readyState);
document.body.innerHTML = xhr.responseText;
发送请求
xhr.send(null);
xhr.send("password=123&username=321");
