<body>
<input type="file" accept="image/*" onchange="loadFile(event)" />
<img id="previewContainer" src="" alt=""/>
<script>
const output = document.querySelector("#previewContainer");
const loadFile = function (event) {
const reader = new FileReader();
reader.onload = function () {
console.log(reader);
output.src = reader.result;
};
reader.readAsDataURL(event.target.files[0]);
};
</script>
</body>
JavaScript本地图片文件预览
为之则易，不为则难。