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老师批语：代码记得加上高亮啊！
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Ajax实战：表单验证</title>
</head>
<body>
<form>
<p>邮箱：<input type="email" name="email"><p>
<p>密码：<input type="password" name="password"></p>
<p><button type="button" name="btn">提交</button></p>
</form>
<script type="text/javascript">
let btn = document.getElementsByTagName('button')[0];
btn.onclick = function() {
//1.创建XMLHTTPRequest()
let xhr = new XMLHttpRequest();
//2.监听响应状态 onreadystatechange()事件，监听服务器状态变化
xhr.onreadystatechange = function() {
if(xhr.readyState === 4) { //readyState属性：请求状态的值，就绪状态4
if(xhr.status === 200) { //status属性：请求的状态码，200说明已从服务器上返回数据
let p = document.createElement('p');
p.style.color = 'red';
let data = JSON.parse(xhr.responseText); //将PHP传回来的json字符串转换成js对象
if(data.status == 1){
p.innerHTML = data.msg;
}else{
p.innerHTML = data.msg;
}
//p.innerHTML = xhr.responseText;
document.forms[0].appendChild(p);
setTimeout(function() {
document.forms[0].removeChild(p);
btn.disabled = false;
if(data.status == 1){
location.href="admin.php";
}
},2000);
btn.setAttribute('disabled',false);
}else{
alert('响应失败'+xhr.status);
}
}else{
//'HTTP正在发送请求' 可放一张加载图片
//alert(xhr.readyState);
}
};
//3.请求参数设置
xhr.open('post','inc/check.php',true);
//4.post方式传输时要设置头信息
xhr.setRequestHeader('Content-Type','application/x-www-form-urlencoded');
//5.发送请求
let data = {
email:document.getElementsByName('email')[0].value,
password:document.getElementsByName('password')[0].value,
};
let json_data = JSON.stringify(data); //将js对象转换为json格式的字符串
xhr.send('data=' + json_data);
//禁用按钮
btn.setAttribute('disabled',false);
}
</script>
</body>
</html>点击 "运行实例" 按钮查看在线实例
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