uniapp中根据图片路径(网络或本地路径)转换为base64
function urlToBase64(url, type = 'png') {let promisespromises = new Promise((resolve, reject) => {uni.request({url: url,method: 'GET',responseType: 'arraybuffer',success: (res) => {const base64 = `data:image/${type};base64,${uni.arrayBufferToBase64(res.data)}`resolve(base64);},fail: (err) => {reject(err);},})})if (!url.startsWith('http')) {promises = new Promise((resolve, reject) => {uni.compressImage({src: url,quality: 100, success: (res) => {const tempUrl = res.tempFilePath plus.io.resolveLocalFileSystemURL(tempUrl, (entry) => {entry.file((e) => {let fileReader = new plus.io.FileReader();fileReader.onload = (r) => {resolve(r.target.result)}fileReader.readAsDataURL(e)})})},fail: (err) => {reject(err);},})})}return promises}