js,JQ 图片转换base64 base64转换为file对象

//将图片转换为Base64function getImgToBase64(url,callback){ ?var canvas = document.createElement(‘canvas‘), ???ctx = canvas.getContext(‘2d‘), ???img = new Image; ?img.crossOrigin = ‘Anonymous‘; ?img.onload = function(){ ???canvas.height = img.height; ???canvas.width = img.width; ???ctx.drawImage(img,0,0); ???var dataURL = canvas.toDataURL(‘image/png‘); ???callback(dataURL); ???canvas = null; ?}; ?img.src = url;}//将base64转换为文件function dataURLtoFile(dataurl, filename) { ?var arr = dataurl.split(‘,‘), mime = arr[0].match(/:(.*?);/)[1], ?bstr = atob(arr[1]), n = bstr.length, u8arr = new Uint8Array(n); ?while(n--){ ?????u8arr[n] = bstr.charCodeAt(n); ?} ?return new File([u8arr], filename, {type:mime});}//将图片转换为base64getImgToBase64(‘images/ruoshui.png‘,function(data){　　　var myFile = dataURLtoFile(data,‘testimgtestimgtestimg‘);　　　console.log(myFile);});