其实和vue关系不大,和我们之前做上传压缩性质是一样的 当然下面的代码是没有处理ios横屏拍照的bug的 有兴趣的可以多搜一下 网上都有相应的解答 、、
var that = this if (e.target.files[0]) { var file = e.target.files[0] var reader = new FileReader() reader.readAsDataURL(file) reader.onload = function() { img.src = this.result } var img = new Image, width = 1024, //image resize 压缩后的宽 quality = 0.8, //image quality 压缩质量 canvas = document.createElement("canvas"), drawer = canvas.getContext("2d"); img.onload = function() { canvas.width = width; canvas.height = width * (img.height / img.width); drawer.drawImage(img, 0, 0, canvas.width, canvas.height);
//上传到七牛云 var base64 = canvas.toDataURL("image/jpeg", quality); // 这里就拿到了压缩后的base64图片 var pic = base64.split(',')[1]; var url = "http://upload-z2.qiniu.com/putb64/-1"; var xhr = new XMLHttpRequest(); xhr.onreadystatechange = function() { if (xhr.readyState == 4) { that.imgs.push(JSON.parse(xhr.responseText).data.key); } } xhr.open("POST", url, true); xhr.setRequestHeader("Content-Type", "application/octet-stream"); xhr.setRequestHeader("Authorization", "UpToken " + ‘七牛云token’); xhr.send(pic); // 清空文件上传控件的值 不清理会出现选择同样的图片会无法触发input事件了 e.target.value = null; }