通过递归来封装sessionStorage---set/get/delete

const  SRORAGE_KEY = ‘mall‘;

export default {
    getStorage(){
        return JSON.parse(window.sessionStorage.getItem(SRORAGE_KEY))
    },

    // 获取某个属性值
    getItem(key, module_key){
        if(module_key) {
            let module_val = this.getItem(module_key)
            if(module_val){
                return module_val[key]
            }
        }else{
            let storage_val = this.getStorage();
            return storage_val[key]
        }
        
    },

    // 设置某个属性值
    setItem(key, val, module_key){
        if(module_key){
            let module_val = this.getItem(module_key)
            module_val[key] = val
            this.setItem(module_key, module_val)
        }else{
            let storage_val = this.getStorage();
            storage_val[key] = val
            window.sessionStorage.setItem(SRORAGE_KEY,JSON.stringify(storage_val))
        }        
    },

    // 清除某个属性值
    clearItem(key, module_key){
        if(module_key){
            let module_val = this.getItem(module_key)
            delete module_val[key]
            this.setItem(module_key, module_val)
        }else {
            let storage_val = this.getStorage();
            delete storage_val[key]
            window.sessionStorage.setItem(SRORAGE_KEY,JSON.stringify(storage_val))
        }
        
    }
}

import storage from ‘../../storage/index.js‘

<script>
import storage from ‘../../storage/index.js‘
export default {
    name: ‘Index‘,
    data () {
        return {
        };
    },
    mounted(){
　　　　　//获取user属性值
        console.log(storage.getItem(‘user‘));
　　　　　//获取user下面的age的属性值
        console.log(storage.getItem(‘age‘,‘user‘));
　　　　　//获取user下面的username的属性值
        console.log(storage.getItem(‘username‘,‘user‘));
        
        //user属性下面，设置passenger:llllll
        storage.setItem(‘passenger‘,‘llllll‘,‘user‘)
　　　　 //user属性下面，设置fffff:mmmm
        
        storage.clearItem(‘fffff‘)
        storage.clearItem(‘aaa‘)
        storage.clearItem(‘passenger‘)
        storage.clearItem(‘passenger‘, ‘user‘)
        storage.clearItem(‘username‘, ‘user‘)
        storage.clearItem(‘age‘, ‘user‘)
        storage.clearItem(‘work‘, ‘user‘)
        storage.setItem(‘aaa‘,‘aaa_val‘)
    }
}

</script>