cocos creator打包生成的wx-downloader.js文件保存到本地会报 no such file or directory 没有上级目录错误，这就我们自己修改这个文件，主要用到了微信小程序中的api FileSystemManger.access 和 FileSystemManager.saveFile方法
代码如下：
/****************************************************************************
Copyright (c) 2017 Chukong Technologies Inc.
http://www.cocos.com
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated engine source code (the "Software"), a limited,
worldwide, royalty-free, non-assignable, revocable and non-exclusive license
to use Cocos Creator solely to develop games on your target platforms. You shall
not use Cocos Creator software for developing other software or tools that's
used for developing games. You are not granted to publish, distribute,
sublicense, and/or sell copies of Cocos Creator.
The software or tools in this License Agreement are licensed, not sold.
Chukong Aipu reserves all rights not expressly granted to you.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.
****************************************************************************/
var ID = 'WXDownloader';
var non_text_format = [
'js','png','jpg','bmp','jpeg','gif','ico','tiff','webp','image','mp3','ogg','wav','m4a','font','eot','ttf','woff','svg','ttc'
];
var readPath = '';
var fs = wx.getFileSystemManager();
// var readPath = '';
var WXDownloader = window.WXDownloader = function () {
this.id = ID;
this.async = true;
this.pipeline = null;
this.REMOTE_SERVER_ROOT = '';
};
WXDownloader.ID = ID;
WXDownloader.prototype.handle = function (item, callback) {
if (item.type === 'js') {
callback(null, null);
return;
}
if (item.type === 'uuid') {
var result = cc.Pipeline.Downloader.PackDownloader.load(item, callback);
// handled by PackDownloader
if (result !== undefined) {
// null result
if (!!result) {
return result;
}
else {
return;
}
}
}
var filePath = item.url;
// Read from package
fs.access({
path: filePath,
success: function () {
if (item.type && non_text_format.indexOf(item.type) !== -1) {
nextPipe(item, callback);
}
else {
readText(item, callback);
}
},
fail: function (res) {
readFromLocal(item, callback);
}
});
};
WXDownloader.prototype.cleanOldAssets = function () {
fs.getSavedFileList({
success: function (res) {
var list = res.fileList;
if (list) {
for (var i = 0; i < list.length; i++) {
var path = list[i].filePath;
fs.unlink({
filePath: list[i].filePath,
success: function () {
cc.log('Removed local file ' + path + ' successfully!');
},
fail: function (res) {
cc.warn('Failed to remove file(' + path + '): ' + res ? res.errMsg : 'unknown error');
}
});
}
}
},
fail: function (res) {
cc.warn('Failed to list all saved files: ' + res ? res.errMsg : 'unknown error');
}
});
};
WXDownloader.prototype.cleanAllAssets = function () {
fs.getSavedFileList({
success: function (res) {
var list = res.fileList;
if (list) {
for (var i = 0; i < list.length; i++) {
var path = list[i].filePath;
fs.unlink({
filePath: list[i].filePath,
success: function () {
cc.log('Removed local file ' + path + ' successfully!');
},
fail: function (res) {
cc.warn('Failed to remove file(' + path + '): ' + res ? res.errMsg : 'unknown error');
}
});
}
}
},
fail: function (res) {
cc.warn('Failed to list all saved files: ' + res ? res.errMsg : 'unknown error');
}
});
};
var wxDownloader = window.wxDownloader = new WXDownloader();
function nextPipe (item, callback) {
var queue = cc.LoadingItems.getQueue(item);
queue.addListener(item.id, function (item) {
if (item.error) {
fs.unlink({
filePath: item.url,
success: function () {
cc.log('Load failed, removed local file ' + item.url + ' successfully!');
}
});
}
});
callback(null, null);
}
function readText (item, callback) {
var url = item.url;
fs.readFile({
filePath: url,
encoding: 'utf8',
success: function (res) {
item.states[cc.loader.downloader.id] = cc.Pipeline.ItemState.COMPLETE;
callback(null, res.data);
},
fail: function (res) {
cc.warn('Read file failed: ' + url);
fs.unlink({
filePath: url,
success: function () {
cc.log('Read file failed, removed local file ' + url + ' successfully!');
}
});
callback({
status: 0,
errorMessage: res && res.errMsg ? res.errMsg : "Read text file failed: " + url
});
}
});
}
function readFromLocal (item, callback) {
var localPath = wx.env.USER_DATA_PATH + '/' + item.url;
// Read from local file cache
console.log("开始读取本地文件<<---");
console.log("localPath is ",localPath);
//查看目录是否存在
fs.access({
path: localPath,
success: function () {
item.url = localPath;
if (item.type && non_text_format.indexOf(item.type) !== -1) {
nextPipe(item, callback);
}
else {
readText(item, callback);
}
},
fail: function (res) {
// No remote server indicated, then continue to downloader
if (!wxDownloader.REMOTE_SERVER_ROOT) {
callback(null, null);
return;
}
console.log("文件或者文件夹不存在");
downloadRemoteFile(item, callback);
}
});
}
function downloadRemoteFile (item, callback) {
// Download from remote server
var relatUrl = item.url;
var remoteUrl = wxDownloader.REMOTE_SERVER_ROOT + '/' + relatUrl;
item.url = remoteUrl;
console.log("开始下载文件-->>>",item.url);
var downloadObj = {
url: remoteUrl,
header: null,
success: function (res) {
if (res.tempFilePath) {
// Save to local path
console.log("下载文件成功");
console.log("relatUrl is ",relatUrl);
console.log(relatUrl.slice(0, relatUrl.lastIndexOf('/')));
//获得文件的上级目录
var parentDir = relatUrl.slice(0, relatUrl.lastIndexOf('/'));
var dirArr = [];
//分割上级目录成数组
dirArr = parentDir.split('/');
console.log(dirArr);
new Promise(function(resolve,reject){
var startDir = '';
dirArr.forEach(function (element) {
startDir += element+'/';
//创建文件夹
fs.mkdir({
dirPath: wx.env.USER_DATA_PATH + '/' + startDir,
success: function () {
// console.log("创建文件夹成功");
},
fail: function (e) {
// console.log("创建文件夹失败",e.errMsg);
}
})
});
resolve("创建文件的所有父目录成功");
}).then(function(){
var localPath = wx.env.USER_DATA_PATH + '/' + relatUrl;
//创建relatUrl上级目录
console.log("保存文件路径是：", localPath);
fs.saveFile({
tempFilePath: res.tempFilePath,
filePath: localPath,
success: function (res) {
cc.log('Write file to ' + res.savedFilePath + ' successfully!');
item.url = res.savedFilePath;
if (item.type && non_text_format.indexOf(item.type) !== -1) {
nextPipe(item, callback);
}
else {
readText(item, callback);
}
},
fail: function (e) {
// Failed to save file, then just use remote url
console.log("保存文件失败！！", e.errMsg);
//如果上级目录不存在
callback(null, null);
}
});
});
} else if (res.statusCode === 404) {
cc.warn("Download file failed: " + remoteUrl);
callback({
status: 0,
errorMessage: res && res.errMsg ? res.errMsg : "Download file failed: " + remoteUrl
});
}
},
fail: function (res) {
// Continue to try download with downloader, most probably will also fail
callback(null, null);
}
}
if(item.url.indexOf('.png') > -1){
var o = {
"content-type":"image/png"
}
downloadObj.header = o;
}else if(item.url.indexOf('.mp3') > -1){
var o1 = {
"content-type":"audio/mp3"
}
downloadObj.header = o1;
}
wx.downloadFile(downloadObj);
}
// function downloadRemoteTextFile (item, callback) {
// // Download from remote server
// var relatUrl = item.url;
// var remoteUrl = wxDownloader.REMOTE_SERVER_ROOT + '/' + relatUrl;
// item.url = remoteUrl;
// wx.request({
// url: remoteUrl,
// success: function(res) {
// if (res.data) {
// if (res.statusCode === 200 || res.statusCode === 0) {
// var data = res.data;
// item.states[cc.loader.downloader.ID] = cc.Pipeline.ItemState.COMPLETE;
// if (data) {
// if (typeof data !== 'string' && !(data instanceof ArrayBuffer)) {
// // Should we check if item.type is json ? If not, loader behavior could be different
// item.states[cc.loader.loader.ID] = cc.Pipeline.ItemState.COMPLETE;
// callback(null, data);
// data = JSON.stringify(data);
// }
// else {
// callback(null, data);
// }
// }
// // Save to local path
// var localPath = wx.env.USER_DATA_PATH + '/' + relatUrl;
// // Should recursively mkdir first
// fs.writeFile({
// filePath: localPath,
// data: data,
// encoding: 'utf8',
// success: function (res) {
// cc.log('Write file to ' + res.savedFilePath + ' successfully!');
// },
// fail: function (res) {
// // undone implementation
// }
// });
// } else {
// cc.warn("Download text file failed: " + remoteUrl);
// callback({
// status:0,
// errorMessage: res && res.errMsg ? res.errMsg : "Download text file failed: " + remoteUrl
// });
// }
// }
// },
// fail: function (res) {
// // Continue to try download with downloader, most probably will also fail
// callback(null, null);
// }
// });
// }
这样就可以愉快的将图片和音频文件存放到本地了。如果哪里有待改进的地方望给为老师及时指正谢谢。