<!DOCTYPE html>
<html lang="en">
<head>
???<meta charset="UTF-8">
???<title>Document</title>
</head>
<body>
???<input type="file" id="file" name="" />
???<div id="image" style="width:390px;height:280px; background:#CCCCCC; float:left;">
???????<img src="__PUBLIC__/images/tu.png" />
???</div>
</body>
<script>
document.getElementById(‘file‘).onchange = function() {
???var imgFile = this.files[0];
???var fr = new FileReader();
???fr.onload = function() {
???????document.getElementById(‘image‘).getElementsByTagName(‘img‘)[0].src = fr.result;
???};
???fr.readAsDataURL(imgFile);
};
</script>
实现图片文件上传之后预览
原文地址：https://www.cnblogs.com/hzb462606/p/8910111.html