state(){
        return{

                filterParams:[] /**设置数组*/
        }

} ，
mutations: {
        updateFilterParams(state,res){
                let filterParams=state.filterParams;
                let len=filterParams.length;

                if(!len){

                        state.filterParams.push(res);

                }else{
                        let key=filterParams.findIndex(e => e.name === res.name);
                        if(key>=0){

                                /**直接通过赋值，不会触发getter方法刷新*/
                                //state.filterParams[key]=res;
                                /***将对象转换一下，然后在从新赋值，就可以解决*/
                                state.filterParams[key]=JSON.parse(JSON.stringify(res));
                         }

                }

        }
}

组件监听：需要加上deep:true。

watch(() => store.state.filterParams,(ov,nv)=>{

       /**相关监听代码**/

      },{deep:true});