base64转为file

base64转为file

base64ImgtoFile (dataurl, filename = 'file') {
        const arr = dataurl.split(',')
        const mime = arr[0].match(/:(.*?);/)[1]
        const suffix = mime.split('/')[1]
        const bstr = atob(arr[1])
        let n = bstr.length
        const u8arr = new Uint8Array(n)
        while (n--) {
          u8arr[n] = bstr.charCodeAt(n)
        }
        return new File([u8arr], `${filename}.${suffix}`, {
          type: mime
        })
      },

		arr.map(item=>{
            // console.log('-----item',item)
            const imageUrl =  "data:image/jpeg;base64," +item;
            var a1={}
            var a2=''
            a1 = this.base64ImgtoFile(imageUrl) // 得到File对象
            a2 = window.webkitURL.createObjectURL(a1) || window.URL.createObjectURL(a1) // imgUrl图片网络路径
            console.log('a1',a1)
            console.log('a2',a2)
            this.filesData.push(a1)

          })
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