使用watch监听路由变化和watch监听对象的实例

export default{data(){return{}},watch:{"$route":"getPath" // 监听事件},methods:{getPath(){let path = this.$roune.path; //或得当前路径进行逻辑判断}}}

<el-select v-model="form.region" placeholder="请选择">   <el-option     v-for="item in rootCategory" :key="item.id"     :label="item.name"     :value="item.id">   </el-option></el-select>export default{data(){return{ form:{ region:""}}},watch:{'form.region':function(newValue,oldValue){console.info(newValue);console.info(oldValue);}}}