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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">
<title>Document</title>
</head>
<body>
</body>
<script>
function downloadFile(url, filename) {
fetch(url, {
headers: new Headers({
Origin: location.origin,
}),
mode: 'cors',
})
.then(res => {
if (res.status == 200) {
return res.blob()
}
throw new Error(`status: ${response.status}.`)
})
.then(blob => {
download(blob, filename)
})
}
function download(blob, filename) {
const a = document.createElement('a')
a.download = filename
const blobUrl = URL.createObjectURL(blob)
a.href = blobUrl
document.body.appendChild(a)
a.click()
a.remove()
URL.revokeObjectURL(blobUrl)
}
downloadFile('www', '1.png');
</script>
</html>