在线直播源码,js 文件上传 图片上传 传输速度计算
<!doctype html>
<html>
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, user-scalable=no, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>Document</title>
<style>
#progress{
height:10px;
width:500px;
border: 1px solid gold;
position: relative;
border-radius: 5px;
}
#progress .progress-item{
height:100%;
position: absolute;
left:0;
top:0;
background: chartreuse;
border-radius: 5px;
transition: width .3s linear;
}
</style>
</head>
<body>
文件上传框<br>
<input type="file" id="file"><br>
显示进度条<br>
<div id="progress">
<div></div>
</div>
上传成功后的返回内容<br>
<span id="callback"></span>
</body>
<script>
//首先监听input框的变动,选中一个新的文件会触发change事件
document.querySelector("#file").addEventListener("change",function () {
//获取到选中的文件
var file = document.querySelector("#file").files[0];
//创建formdata对象
var formdata = new FormData();
formdata.append("file",file);
//创建xhr,使用ajax进行文件上传
var xhr = new XMLHttpRequest();
xhr.open("post","/");
//回调
xhr.onreadystatechange = function () {
if (xhr.readyState==4 && xhr.status==200){
document.querySelector("#callback").innerText = xhr.responseText;
}
}
//获取上传的进度
xhr.upload.onprogress = function (event) {
if(event.lengthComputable){
var percent = event.loaded/event.total *100;
document.querySelector("#progress .progress-item").style.width = percent+"%";
}
}
//将formdata上传
xhr.send(formdata);
});
</script>
</html>
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标签:文件,formdata,js,xhr,源码,file,progress,上传 From: https://www.cnblogs.com/yunbaomengnan/p/17814859.html