HTML+JS实现本地图片预览（基础功能）
一、预览功能
二、程序代码
<!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>HTML+JS实现本地图片预览</title>
</head>
<body>
<input type="file" name="" accept="image/*,.jpeg" id="upload">
<img src="" alt="" class="preview">
<script>
var input = document.querySelector("#upload");
var img = document.querySelector(".preview");
input.onchange = (e) => {
var file = e.target.files[0];
var reader = new FileReader();
reader.onload = function (event) {
img.src = event.target.result;
};
reader.readAsDataURL(file);
};
</script>
</body>
</html>
