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testing.html
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testing.html
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
</head>
<body>
<input type="file" id="potato"></input>
<button id="submit" onclick="log">submit</button>
</body>
<script>
document.getElementById("submit").addEventListener("onclick", log)
function log() {
var a = document.getElementById("potato").files[0]
var reader = new FileReader()
console.log(a)
var body = document.getElementsByTagName("body")[0]
reader.addEventListener("load", function() {
console.log(reader.result)
console.log(body)
body.style.background = "url(" + reader.result + ")"
}, false)
reader.readAsDataURL(a)
}
</script>
</html>