// 图片转为base64格式
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export const imageToBase64 = (img) => {
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var canvas = document.createElement('canvas')
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canvas.width = img.width
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canvas.height = img.height
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var ctx = canvas.getContext('2d')
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ctx.drawImage(img, 0, 0, img.width, img.height)
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var ext = img.src.substring(img.src.lastIndexOf('.') + 1).toLowerCase()
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var dataURL = canvas.toDataURL('image/jpeg' + ext)
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return dataURL
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}
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export const base64ToFile = (urlData, fileName) => {
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const arr = urlData.split(',')
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const mime = arr[0].match(/:(.*?);/)[1]
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const bytes = atob(arr[1]) // 解码base64
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let n = bytes.length
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const ia = new Uint8Array(n)
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while (n--) {
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ia[n] = bytes.charCodeAt(n)
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}
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return new File([ia], fileName, { type: mime })
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}
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