二进制流转base64加快速度

updateImgList() {

const reg = /\.(\w+)$/

const __arrPromise__ = []

const self = this

for (let i = 0; i < self.totalPicture[self.pageNum].length; i++) {

const fn = new Promise((resolve) => {

self.$api.getArrayBuffer(self.totalPicture[self.pageNum][i].id).then((response) => {

let obj = null

// 是否TIF和TIFF格式的图片

if (self.totalPicture[self.pageNum][i].filePath.match(reg)[1] === 'tif' || self.totalPicture[self.pageNum][i].filePath.match(reg)[1] === 'tiff') {

// eslint-disable-next-line no-undef

const tiff = new Tiff({ buffer: response })

obj = {

id: self.totalPicture[self.pageNum][i].id,

type: 'tif',

url: tiff.toDataURL()

}

} else {

obj = {

type: 'mormal',

id: self.totalPicture[self.pageNum][i].id,

url: ('data:data/png;base64,' + btoa(

new Uint8Array(response).reduce((data, byte) => data + String.fromCharCode(byte), '')

))

// '/label/job-picture/show-image?id=' + self.totalPicture[self.pageNum][i].id

}

}

resolve(obj)

}).catch(error => {})

})

__arrPromise__.push(fn)

}

Promise.all(__arrPromise__).then((res) => {

self.imgList = self.imgList.concat(res)

let activeIndex = 0

if (self.imgSwiper) {

activeIndex = self.imgSwiper.activeIndex

}

if (self.pageNum == 0) {

self.$nextTick(() => {

self.initSwiper()

})

}

self.updateTopImg(self.imgList[activeIndex].id)

})

},