1.XMLHttpRequest使用
<!DOCTYPE html>
<html lang="en">
<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>
<script>
window.onload = function () {
let oBtn = document.querySelector('input')
oBtn.addEventListener('click', function () {
let xhr = new XMLHttpRequest()
xhr.open('post', '/login', true)
xhr.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
xhr.send(JSON.stringify({fda:'fdsa',bv:'fdagr'}));
})
}
</script>
</head>
<body>
<input type="button" value="登录">
</body>
</html>
- XMLHttpRequest上传文件
<!DOCTYPE html>
<html lang="en">
<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>
<script>
window.onload=function(){
document.querySelector('input[type="button"]').onclick=function(){
var fileObj = document.getElementById("file").files[0];
var form = new FormData()
form.append("mf", fileObj)
form.append("user", document.querySelectorAll('input')[0].value)
form.append("pass", document.querySelectorAll('input')[1].value)
let xhr=new XMLHttpRequest()
xhr.open('post','/upload',true)
xhr.send(form)
xhr.onload=function(){
if (xhr.status === 200) {
var obj = JSON.parse(xhr.responseText);
if(obj.e =='suc'){
alert('上传成功')
}else{
alert(obj.msg)
}
} else {
console.error('Something went terribly wrong...');
}
}
}
}
</script>
</head>
<body>
<form>
用户：<input type="text" name="user"><br/>
密码：<input type="text" name="pass"><br/>
文件：<input type="file" id="file" name="file"/><br/>
<input type="button" value="提交">
</form>
</body>
</html>
