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| class FileCache {
|
| constructor() {
| this.fileInfos = {};
| }
|
| _load(url, callback, retryCount) {
| if (retryCount <= 0) {
| return;
| }
| retryCount--;
| var self = this;
| if (this.fileInfos[url]) {
| callback && callback({
| errCode: 0,
| errMsg: '',
| tmpFilePath: self.fileInfos[url].tmpFilePath
| })
| } else {
| wx.downloadFile({
| url: url,
| success: function (res) {
| self.fileInfos[url] = {
| tmpFilePath: res.tempFilePath
| }
| callback && callback({
| errCode: 0,
| errMsg: '',
| tmpFilePath: self.fileInfos[url].tmpFilePath
| })
| },
| fail: function (res) {
| console.error('下载图片失败:', res);
| if (retryCount <= 0) {
| callback && callback(res);
| } else {
| self._load(url, callback, retryCount);
| }
| }
| })
| }
| }
|
| load(url, callback) {
| this._load(url, callback, 3);
| }
| }
|
| module.exports = FileCache;
|
|
