1. getBase64Image (src) {
    2.   const getBase64Image = function (img, type) {
    3.     let canvas = document.createElement('canvas')
    4.     canvas.width = img.width
    5.     canvas.height = img.height
    6.     let ctx = canvas.getContext('2d')
    7.     ctx.drawImage(img, 0, 0, img.width, img.height)
    8.     return canvas.toDataURL(`image/${type}`)
    9.   }
    10.   const getType = function (upFileName) {
    11.     let index1 = upFileName.lastIndexOf('.')
    12.     let index2 = upFileName.length
    13.     let type = upFileName.substring(index1 + 1, index2)
    14.     if (type === 'jpg') {
    15.       return 'jpeg'
    16.     }
    17.     return type
    18.   }
    19.   return new Promise(resolve => {
    20.     let img = document.createElement('img')
    21.     img.crossOrigin = 'Anonymous'
    22.     img.onload = function () {
    23.       let data = getBase64Image(img, getType(src))
    24.       resolve(data)
    25.     }
    26.     img.src = src
    27.   })
    28. }