localStorage使用
/*
* @Author: iLonge
* @Date: 2018-07-02 08:47:55
* @Last Modified by: iLonge
* @Last Modified time: 2018-07-02 10:25:23
* 日常用函数的封装
*/
// localStorage
var Storage = {
/**
* 获取
* 在获取时处理，如果是JSON格式，那么将其转换为JSON，而不是字符串
*/
get : function(key) {
var value = localStorage.getItem(key);
if(value) {
try {
var value_json = JSON.parse(value);
if(typeof value_json === 'object') {
return value_json;
} else if(typeof value_json === 'number') {
return value_json;
}
} catch(e) {
return value;
}
} else {
return false;
}
},
/**
* 设置
* 考虑到可能会达到大小限制，因此加上错误捕捉
*/
set: function(key,value) {
try {
localStorage.setItem(key, value);
} catch (e) {
if (this.isQuotaExceeded(e)) {
console.log('Storage full');
}
}
},
// 删除
remove: function(key) {
localStorage.removeItem(key);
},
// 清除
clear: function() {
localStorage.clear();
},
/**
* 批量保存，data是一个字典
*/
setList: function(list) {
for (var i in list) {
localStorage.setItem(i, list[i]);
}
},
/**
* 批量删除
*/
removeList: function(list) {
for(var i=0, len = list.length; i < len; i++) {
localStorage.removeItem(list[i])
}
},
/**
* 大小限制
*/
isQuotaExceeded: function(e) {
var quotaExceeded = false;
if (e) {
if (e.code) {
switch (e.code) {
case 22:
quotaExceeded = true;
break;
case 1014:
// Firefox
if (e.name === 'NS_ERROR_DOM_QUOTA_REACHED') {
quotaExceeded = true;
}
break;
}
} else if (e.number === -2147024882) {
// Internet Explorer 8
quotaExceeded = true;
}
}
return quotaExceeded;
},
/**
* 是否支持localStorage存储
*/
isSupport: function() {
if (window.localStorage) {
alert('支持')
return true;
} else {
alert('您的浏览器不支持localStorage存储')
return false
}
}
}
