1.适用于图片预览的场景
2.适用于图片转base64
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
<style>
#f {
display: none;
}
#box {
width: 100px;
height: 100px;
background-color: skyblue;
}
</style>
</head>
<body>
<input id="f" type="file">
<div id="box"></div>
<img id="i" src="" alt="">
<script>
let f = document.getElementById('f');
let i = document.getElementById('i');
document.getElementById('box').onclick = function () {
f.click();
}
let r = new FileReader();
r.addEventListener('load', function (e) {
let base64 = e.target.result;
i.src = base64;
console.log(base64);
})
f.onchange = function (e) {
r.readAsDataURL(e.target.files[0]);
}
</script>
</body>
</html>
