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修复bug:destroy后不刷新页面重新create时,即使传入新的column字段,表格的大小也还是第一次createe时设定的值,原因在于create时Store从defaultSettings中读取了对象,而后续又经由Store对该对象进行了修改,导致对该对象的修改直接修改到了defaultSettings里面(毕竟defaultSettings不是一个扁平的对象),而destroy时并没有把defaultSettings还原,只还原了Store等其它对象。做为defaultSettings,应该是只读的,所以本pr在合并defaultSettings时先将其深度克隆一遍以防止其被修改,就可以防止第二次create时用到上一次的数据了。