logpm/utils/cacheimg.js

import base64 from '@/utils/base64.js';
export function getImageCache(filePath,fileMd51) {
    //console.log('caoxx')
    // #ifdef APP-PLUS
    return new Promise((resolve, reject) => {
        //console.log(filePath);
        let fileMd5 = "";
        try{
            fileMd5 = base64.encode(filePath);
        }catch(e){
            fileMd5 = filePath;
        }
		// console.log(fileMd5);
        // 图片缓存key值
        let storageKey = 'IMAGE_CACHE_INFO_' + fileMd5
        // 首先获取本地存储的数据，查询是否有对应文件路径，如果有缓存内容，直接返回
        const cacheFileInfo = uni.getStorageSync(storageKey)
        if (cacheFileInfo) {
            // console.log("已缓存为：" + cacheFileInfo)
            resolve(cacheFileInfo)
            return;
            //return cacheFileInfo
        } else {
            // console.log("未缓存,进行下载保存")
            // 如果没有，执行下载，并存储起来后
            uni.downloadFile({
                url: filePath,
                success: (res) => {
                    if (res.statusCode === 200) {
                        //console.log('下载成功',filePath,res);
                        // 再进行本地保存

                        uni.saveFile({
                            tempFilePath: res.tempFilePath,
                            success: function(res2) {
                                //console.log(res2)
                                var t0 = plus.io.convertLocalFileSystemURL(res2.savedFilePath);
                                var t0 = res2.savedFilePath // plus.io.convertLocalFileSystemURL(res2.savedFilePath);
                                //var t0 =  'file://'+ plus.io.convertLocalFileSystemURL(res2.savedFilePath);
                                // console.log(t0);
                                //t0 = plus.io.convertAbsoluteFileSystem(res2.savedFilePath);
                                //console.log(t0);
                                //t0 = t0 + "test"
                                uni.setStorageSync(storageKey, t0)
                                resolve(t0)
                                //return res2.savedFilePath
                                return;
                            },
                            fail: function(res2) {
                                resolve(filePath);
                                //return filePath
                                return;
                            }
                        })
    
                    } else {
                        console.log('下载临时文件失败')
                        resolve(filePath);
                        //return filePath
                        return;
                    }
                },
                fail: (res) => {
                    console.log(res)
                    resolve(filePath);
                    //return filePath
                    return;
                }
            })
        }
    })
    // #endif
    // #ifndef APP-PLUS
    return new Promise((resolve, reject) => {
        //reject({
        //  message: '请在App中使用'
        //})
        resolve(filePath);
    })
    // #endif
}