纯HTML 调用摄像头 获取拍照后的图片的base64
直接上代码：
<!DOCTYPE html> <html> <head> <meta charset="utf-8"> <title>Web USB Camera</title> </head> <body> <video id="video" width="400" autoplay playsinline></video> <br> <button id="snap">拍照</button> <br> <img id="photo" style="margin-top:10px; width:400px;"> <br> <!-- ✅ 新增：用于完整显示 Base64 --> <textarea id="output" style="width:100%;height:200px;margin-top:10px;"></textarea> <script> const video = document.getElementById("video"); const photo = document.getElementById("photo"); const snapBtn = document.getElementById("snap"); const output = document.getElementById("output"); // ✅ 新增引用 // 获取摄像头 navigator.mediaDevices.getUserMedia({ video: true }) .then(stream => { video.srcObject = stream; }) .catch(err => { alert("无法访问摄像头: " + err); }); // 拍照 snapBtn.onclick = function() { const canvas = document.createElement("canvas"); canvas.width = video.videoWidth; canvas.height = video.videoHeight; const ctx = canvas.getContext("2d"); ctx.drawImage(video, 0, 0); photo.src = canvas.toDataURL("image/png"); // ✅ 新增：完整 Base64 放进 textarea output.value = photo.src; console.log("Base64 length:", photo.src.length); }; </script> </body> </html>效果如下图所示：
可以验证一下base64 是否正常 访问网站：
https://remeins.com/index/app/base64img
