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index.html
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<!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>Download</title>
<style>
.container {
width: 500px;
height: 100px;
position: absolute;
top: 0;
bottom: 0;
right: 0;
left: 0;
margin: auto;
}
.container button {
position: absolute;
right: 0;
border-radius: 2px;
}
.progress {
width: 100%;
height: 10px;
margin-top: 10px;
background: #eee;
}
.progress-bar {
height: 100%;
width: 0;
background: #f4e;
}
</style>
</head>
<body>
<div class="container">
<span id="filename"></span>
<button type="button" onclick="download()">点击下载</button>
<div class="progress">
<div id="progress-bar" class="progress-bar"></div>
</div>
</div>
<script>
const filename = 'test.zip'
let oProgressBar = document.getElementById('progress-bar')
let oFilename = document.getElementById('filename')
oFilename.innerHTML = 'filename: ' + filename
function download() {
let xhr = createXHR()
// xhr.responseType = "blob"
xhr.onload = function () {
if ((xhr.status > 200 && xhr.status < 300) || xhr.status == 304) {
console.log(xhr.responseText)
} else if (xhr.status === 200) {
// 这块如果用的是后端给你返回的url，将这个url作为隐藏的a标签的href然后自动点击就好啦～
// let blob = xhr.response
// let reader = new FileReader()
// reader.readAsDataURL(blob)
// reader.onload = function (e) {
// let a = document.createElement('a')
// a.download = filename
// a.href = e.target.result
// a.click()
// }
console.log("Request was successful: " + xhr.status)
}
}
xhr.onprogress = function (event) {
if (event.lengthComputable) {
oProgressBar.style.width = 500 * (event.loaded / event.total) + 'px'
oFilename.innerHTML = 'filename: ' + filename + ' | timeStamp: ' + event.timeStamp
}
else console.log('server not response Content-Length')
}
xhr.open("post", "http://127.0.0.1:9999/" + filename, true)
xhr.send(null)
}
function createXHR() {
if (typeof XMLHttpRequest != "undefined") {
return new XMLHttpRequest();
} else if (typeof ActiveXObject != "undefined") {
if (typeof arguments.callee.activeXString != "string") {
const versions = ["MSXML2.XMLHttp.6.0", "MSXML2.XMLHttp.3.0", "MSXML2.XMLHttp"];
for (let i = 0, len = versions.length; i < len; i++) {
try {
let xhr = new ActiveXObject(versions[i]);
arguments.callee.activeXString = versions[i];
return xhr;
} catch (ex) {
console.log(ex)
}
}
}
return new ActiveXObject(arguments.callee.activeXString);
} else {
throw new Error("NO XHR object...")
}
}
</script>
</body>
</html>