执行：composer update 时，提示：No valid bower.json was found in any branch or tag of https://github.com/blueimp/JavaScript-Canvas-to-Blob.git, cou ld not load a package from it. 的解决
1、执行：composer update 时，提示：No valid bower.json was found in any branch or tag of https://github.com/blueimp/JavaScript-Canvas-to-Blob.git, cou
ld not load a package from it. 如图1
图1
2、执行：composer global require “fxp/composer-asset-plugin”，更新Composer asset plugin至最新版本，如图2
图2
3、怀疑是蓝灯导致的网络问题，退出蓝灯，如图3
图3
4、再次执行：composer update ，成功，如图4
图4
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