一：html代码
<input id="upload_image" type="file" accept="image/*" capture="camera"onchange="upload(‘#upload_image‘, ‘#preview_image‘);"/> ??????????????????????????????<img id="preview_image" src="" style="width:80%;text-align:center;">
二：js代码
//照片var photo = null//上传图片function upload(upload_id, preview_id) { ???var $upload = document.querySelector(upload_id), ???????$preview = document.querySelector(preview_id), ???????file = $upload.files[0], ???????reader = new FileReader(); ???reader.readAsDataURL(file); ???reader.onload = function (e) { ???????//获取照片 ???????photo = e.target.result ???????$preview.setAttribute("src", photo); ???};};上传图片：直接把photo上传即可，photo保存了图片的base64编码。
js上传图片并预览
原文地址：https://www.cnblogs.com/ygj0930/p/8505014.html