单项选择题
A.< HelloMessage name="John">B.< HelloMessage [name]="John">C.< HelloMessage "name"="John">D.< HelloMessage {name}="John">
A.beforeEachB.beforeRouteEnterC.beforeRouteUpdateD.beforeRouteLeave
A.componentWillReceivePropsB.shouldComponentUpdateC.componentWillMountD.componentWillUnmount