效果图：
代码：（demo33.jsp）
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
<title>demo33.jsp</title>
</head>
<body>
<label for="text">名称</label>
<input type="text" id="text" name="name"/>
<label for="file">文件</label>
<input type="file" id="file" name="file"/>
<button type="button" onclick="ajaxUploadFile()">确定</button>
</body>
<script type="text/javascript">
function ajaxUploadFile() {
var formData = new FormData();
var xmlhttp;
if (window.XMLHttpRequest) {// code for IE7+, Firefox, Chrome, Opera, Safari
xmlhttp = new XMLHttpRequest();
}else {// code for IE6, IE5
xmlhttp = new ActiveXObject("Microsoft.XMLHTTP");
}
xmlhttp.open("POST","/data",true);
xmlhttp.setRequestHeader("X-Requested-With", "XMLHttpRequest");
formData.append("name",document.getElementById("text").value);
formData.append("file",document.getElementById("file").files[0]);
xmlhttp.send(formData);
xmlhttp.onreadystatechange=function() {
if (xmlhttp.readyState==4) {
if (xmlhttp.status==200) {
console.log("上传成功"+xmlhttp.responseText);
}else {
console.log("上传失败"+xmlhttp.responseText);
}
}
}
}
</script>
</html>Atas ialah kandungan terperinci 原生js实现文件异步上传的方法. Untuk maklumat lanjut, sila ikut artikel berkaitan lain di laman web China PHP!
![[Web front-end] Permulaan pantas Node.js](https://img.php.cn/upload/course/000/000/067/662b5d34ba7c0227.png)
