Collection
Collection
![[Web front-end] Node.js quick start](https://img.php.cn/upload/course/000/000/067/662b5d34ba7c0227.png)
<!DOCTYPE html>
<html lang="zh">
<head>
<meta charset="UTF-8" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<meta http-equiv="X-UA-Compatible" content="ie=edge" />
<title>Document</title>
</head>
<body>
Name:<input type="text" name="" id="" value="" onblur="check(this)"/><font></font>
</body>
<script type="text/javascript">
function check(obj){
//alert(obj);
//获取Input输入的值
var name = obj.value;
var ajax = new XMLHttpRequest();
ajax.open('get','./get.php?name='+name,true);
ajax.send();
ajax.onreadystatechange = function(){
if(ajax.readyState == 4 && ajax.status ==200){
var result = ajax.responseText;
if(result == 0){
obj.nextSibling.innerHTML = '<img src="./cou.png">已经注册';
obj.nextSibling.color = 'red';
}else{
obj.nextSibling.innerHTML ='<img src="./dui.png">';
obj.nextSibling.color = 'green';
}
}
}
}
</script>
</html>点击 "运行实例" 按钮查看在线实例
