js img 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"> <meta http-equiv="X-UA-Compatible" content="ie=edge"> <title>Document</title> <style> </style> </head> <body> <div> <input type="file" id="myimg" οnchange="imgChange(this)" accept="image/png,image/gif,image/jpeg"/> <img width="300px" src="" alt=""> </div> <script> function imgChange(img) { // 生成一个文件读取的对象 const reader = new FileReader(); reader.onload = function (ev) { // base64码 var imgFile =ev.target.result;//或e.target都是一样的 document.querySelector("img").src= ev