<el-collapse v-model="activeNames" @change="handleChange"> <el-collapse-item title="Consistency" name="1"> <div> Consistent with real life: in line with the process and logic of real life, and comply with languages and habits that the users are used to; </div> <div> Consistent within interface: all elements should be consistent, such as: design style, icons and texts, position of elements, etc. </div> </el-collapse-item> <el-collapse-item title="Feedback" name="2"> <div> Operation feedback: enable the users to clearly perceive their operations by style updates and interactive effects; </div> <div> Visual feedback: reflect current state by updating or rearranging elements of the page. </div> </el-collapse-item> <el-collapse-item title="Efficiency" name="3"> <div> Simplify the process: keep operating process simple and intuitive; </div> <div> Definite and clear: enunciate your intentions clearly so that the users can quickly understand and make decisions; </div> <div> Easy to identify: the interface should be straightforward, which helps the users to identify and frees them from memorizing and recalling. </div> </el-collapse-item> <el-collapse-item title="Controllability" name="4"> <div> Decision making: giving advices about operations is acceptable, but do not make decisions for the users; </div> <div> Controlled consequences: users should be granted the freedom to operate, including canceling, aborting or terminating current operation. </div> </el-collapse-item></el-collapse>