D:\wamp\www\basic>php composer.phar require yiisoft/yii2-gii 2.0.4
"./composer.json" does not contain valid JSON Parse error on line 22: ...-gii": "2.0.4", }, "require-dev" ---------------------^ Expected: 'STRING' - It appears you have an extra trailing comma require [--dev] ............老师出现这种情况是怎么回事??