出于优化资源的目的，准备把图片资源转换成webP格式的。 格式在浏览器中加载不出来
错误代码：
Error: Load Webp ( res/raw-assets/resources/bigpic/new_gameName.webp ) failed
at downloadWebp (http://localhost:7456/app/engine/bin/cocos2d-js-for-preview.js:26288:38)
at Downloader.prototype.handle (http://localhost:7456/app/engine/bin/cocos2d-js-for-preview.js:26430:9)
at flow (http://localhost:7456/app/engine/bin/cocos2d-js-for-preview.js:27012:9)
at Anonymous function (http://localhost:7456/app/engine/bin/cocos2d-js-for-preview.js:27020:20)
at Anonymous function (http://localhost:7456/app/engine/bin/cocos2d-js-for-preview.js:26016:13)
at AssetLibrary.queryAssetInfo (http://localhost:7456/app/engine/bin/cocos2d-js-for-preview.js:30127:9)
at AssetLoader.prototype.handle (http://localhost:7456/app/engine/bin/cocos2d-js-for-preview.js:25992:7)
at flow (http://localhost:7456/app/engine/bin/cocos2d-js-for-preview.js:27012:9)
at proto.flowIn (http://localhost:7456/app/engine/bin/cocos2d-js-for-preview.js:27085:11)
at proto.append (http://localhost:7456/app/engine/bin/cocos2d-js-for-
请问有大神知道怎么解决吗？