function dataURLtoFile(dataurl, filename) {//将base64转换为文件 var arr = dataurl.split(','), mime = arr[0].match(/:(.*?);/)[1], bstr = atob(arr[1])
canvas.width=img.width; ctx.drawImage(img,0,0);vardataURL = canvas.toDataURL('image/png'); callback(dataURL); canvas=null; }; img.src=url; } 将base64转换为file类型 function dataURLtoFile(dataurl, filename) {vararr = dataurl.split(','), mime = arr[0].match(/:(.*?);/)[1]...
js 图片转换base64 base64转换为file对象 代码语言:javascript 复制 functiongetImgToBase64(url,callback){//将图片转换为Base64varcanvas=document.createElement('canvas'),ctx=canvas.getContext('2d'),img=newImage;img.crossOrigin='Anonymous';img.onload=function(){canvas.height=img.height;canvas.width=img...
ctx.drawImage(img, 0, 0) let dataURL = canvas.toDataURL('image/png') callback(dataURL) canvas = null } } function base64ToFile(data,) { let base = window.atob(data.substring(data.indexOf(',') + 1)) let length = base.length let url = new Uint8Array(length) while (length--)...
转化思路:base64 --> Uint8Array --> new File() 示例代码: /** * Base64转 * @param base64 String base64格式字符串 * @param contentType String file对象的文件类型,如:"image/png" * @param filename String 文件名称或者文件路径 */functiontranslateBase64ImgToFile(base64,filename,contentType)...
js图片转换 base64base64转换为 file对象 function getImgToBase64(url,callback){//将图片转换为Base64 var canvas = document.createElement('canvas'), ctx = canvas.getContext('2d'), img = new Image; img.crossOrigin = 'Anonymous'; img.onload = function(){ canvas.height = img.height; canvas...
(base64Data,150,'image/png',(newBase64Data:any)=>{console.log('newBase64Data',newBase64Data.length);// 压缩后的长度constblob=dataURLtoBlob(newBase64Data);constfile=blobToFile(blob,'image.png');constformData=newFormData();formData.append("file",file);console.log('formData',formData);}...
方法一:直接将base64转换为file对象: 首先,通过base64字符串获取文件类型,并将base64字符串通过atob解码为二进制数据,最后通过new File()创建file对象。 Function base64toFile(base64Str, fileName) { let arr = base64Str.split(','); console.log(arr[0]) ...
toDataURL('image/png') callback(dataURL) canvas = null } } function base64ToFile(data, callback) { let base = window.atob(data.substring(data.indexOf(',') + 1)) let length = base.length let url = new Uint8Array(length) while (length--) { url[length] = base.charCodeAt(length)...
他们之间是可以相互转化的,上传图片一般会拿到blob和file 图片压缩 压缩我们选用canvas来进行压缩,toDataURL方式会把图片自动转成base64 使用canvas压缩图片*代码 exportfunctiontranslate(imgData, callback) {varimg =newImage(); img.src= imgData.tempFilePaths[0]; ...