uniapp 获取和清除缓存

获取缓存

 // 计算缓存
                getStorageSize() {
                  console.log(123)
                  let that = this;
                  plus.cache.calculate(function(size) {
                    let sizeCache = parseInt(size);
                    if (sizeCache == 0) {
                      that.fileSizeString = "0B";
                    } else if (sizeCache < 1024) {
                      that.fileSizeString = sizeCache + "B";
                    } else if (sizeCache < 1048576) {
                      that.fileSizeString = (sizeCache / 1024).toFixed(2) + "K";
                    } else if (sizeCache < 1073741824) {
                      that.fileSizeString = (sizeCache / 1048576).toFixed(2) + "M";
                    } else {
                      that.fileSizeString = (sizeCache / 1073741824).toFixed(2) + "G";
                    }
                  });
                },

清除缓存

 // 清理缓存
                clearStorage() {
                  let that = this;
                  let os = plus.os.name;
                  if (os == 'Android') {
                    let main = plus.android.runtimeMainActivity();
                    let sdRoot = main.getCacheDir();
                    let files = plus.android.invoke(sdRoot, "listFiles");
                    let len = files.length;
                    for (let i = 0; i < len; i++) {
                      let filePath = '' + files[i]; // 没有找到合适的方法获取路径，这样写可以转成文件路径
                      plus.io.resolveLocalFileSystemURL(filePath, function(entry) {
                        if (entry.isDirectory) {
                          entry.removeRecursively(function(entry) { //递归删除其下的所有文件及子目录
                            uni.showToast({
                              title: '缓存清理完成',
                              duration: 2000
                            });
                            that.getStorageSize(); // 重新计算缓存
                          }, function(e) {
                            console.log(e.message)
                          });
                        } else {
                          entry.remove();
                        }
                      }, function(e) {
                        console.log('文件路径读取失败')
                      });
                    }
                  } else { // ios
                    plus.cache.clear(function() {
                      uni.showToast({
                        title: '缓存清理完成',
                        duration: 2000
                      });
                      that.getStorageSize();
                    });
                  }
                },