weex里Vuex state使用storage持久化详解
(编辑：jimmy 日期: 2024/11/16 浏览：3 次 )
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const storage = weex.requireModule('storage')
定义state
var state = {
banner:[],
activeTabIndex:0,
lists: {
searchList:[],
tabColumns: {
new:[],
hot:[],
select:[]
},
items:[]
}
}
初始化时，从storage加载state数据
// 从storage里加载数据
storage.getItem(STORAGE_KEY, event => {
if (event.result == "success" && event.data){
// 这里可以使用extend等方法，这里仅举例说明
var data = JSON.parse(event.data);
state.banner = data.banner;
state.activeTabIndex = data.activeTabIndex;
}
})
关键来了，如何存储？Vuex提供了插件机制，我们可以通过插件订阅state的每一次更改，在更改的时候保存我们感兴趣的就OK了
// 存储plugin，存储感兴趣的数据，store里数据太多，没必要全持久化
const storagePlugin = store => {
store.subscribe((mutation, {activeTabIndex,banner}) => {
storage.setItem(STORAGE_KEY, JSON.stringify({activeTabIndex,banner}),event => {
console.log('cache success');
})
})
}
最后，创建Vuex，大功告成
const store = new Vuex.Store({
actions,
mutations,
plugins:[storagePlugin],
state: state,
getters: {
// ids of the items that should be currently displayed based on
// current list type and current pagination
activeIds (state) {
const { activeType, lists, counts } = state
return activeType ? lists[activeType].slice(0, counts[activeType]) : []
},
// items that should be currently displayed.
// this Array may not be fully fetched.
activeItems (state, getters) {
return getters.activeIds.map(id => state.items[id]).filter(_ => _)
}
}
})
以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持。
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