base64ToBlob/index.js

/**
 * 功能：图片base64转换为blob
 * @param {string} base64Url
 * @returns {Blob} - Blob对象
 */
function base64ToBlob(base64Url='') {
    var bytes = window.atob(base64Url.split(',')[1]) // 去掉url的头，并转换为byte
    //处理异常,将ascii码小于0的转换为大于0
    var ab = new ArrayBuffer(bytes.length)
    var ia = new Uint8Array(ab)
    for (var i = 0; i < bytes.length; i++) {
      ia[i] = bytes.charCodeAt(i)
    }
    return new Blob([ab], { type: 'image/png' })
  }
  export default  base64ToBlob