/**
* localstorage标准封装
*/
const myStorage = {
//存储
set(key, value) {
localStorage.setItem(key, JSON.stringify(value));
},
//取出数据
get(key) {
try {
const value = localStorage.getItem(key);
if (value === null || value === undefined || value === "") {
return null;
}
return JSON.parse(localStorage.getItem(key));
} catch (err) {
return null
}
},
// 删除数据
remove(key) {
localStorage.removeItem(key);
}
}
/**
* sessionStorage标准封装
*/
const mySession = {
//存储
set(key, value) {
sessionStorage.setItem(key, JSON.stringify(value));
},
//取出数据
get(key) {
try {
const value = sessionStorage.getItem(key);
if (value === null || value === undefined || value === "") {
return null;
}
return JSON.parse(sessionStorage.getItem(key));
} catch (err) {
return null
}
},
// 删除数据
remove(key) {
sessionStorage.removeItem(key);
}
}
/**
* localstorage定时缓存封装，设置缓存时如果没有设置时间,单位分钟，默认60分钟
*/
const timeStorage = {
//存储
set(key, value, time) {
try {
if (!localStorage) {
return null;
}
//如果没有设置时间或者为NaN,则设置默认时间为24小时
if (!time || isNaN(time)) {
time = 60;
}
//过期时间的毫秒数
const endTime = (new Date()).getTime() + time * 60 * 1000;
// 将时间和值一起存储
localStorage.setItem(key, JSON.stringify({ data: value, time: endTime }));
} catch (e) {
return null;
}
},
//取出数据
get(key) {
try {
if (!localStorage || !localStorage.getItem(key)) {
return null;
}
//获取缓存数据
const result = JSON.parse(localStorage.getItem(key));
//目前时间的毫秒数
const now = (new Date()).getTime()
//如果缓存时间过期则移除数据
if (now > result.time) {
this.remove(key);
return null;
}
return result.data;
} catch (e) {
this.remove(key);
return null;
}
},
// 删除数据
remove(key) {
localStorage.removeItem(key);
}
}
// 暴露给外部访问
export {
myStorage,
mySession,
timeStorage
};
