1 function setLocalStorage(key, value) {
2 var curtime = new Date().getTime(); // 获取当前时间 ，转换成JSON字符串序列
3 var valueDate = JSON.stringify({
4 val: value,
5 timer: curtime
6 });
7 try {
8 localStorage.setItem(key, valueDate);
9 } catch(e) {
10 /*if(e.name === 'QUOTA_EXCEEDED_ERR' || e.name === 'NS_ERROR_DOM_QUOTA_REACHED') {
11 console.log("Error: 本地存储超过限制");
12 localStorage.clear();
13 } else {
14 console.log("Error: 保存到本地存储失败");
15 }*/
16 // 兼容性写法
17 if(isQuotaExceeded(e)) {
18 console.log("Error: 本地存储超过限制");
19 localStorage.clear();
20 } else {
21 console.log("Error: 保存到本地存储失败");
22 }
23 }
24 }
25
26 function isQuotaExceeded(e) {
27 var quotaExceeded = false;
28 if(e) {
29 if(e.code) {
30 switch(e.code) {
31 case 22:
32 quotaExceeded = true;
33 break;
34 case 1014: // Firefox
35 if(e.name === 'NS_ERROR_DOM_QUOTA_REACHED') {
36 quotaExceeded = true;
37 }
38 break;
39 }
40 } else if(e.number === -2147024882) { // IE8
41 quotaExceeded = true;
42 }
43 }
44 return quotaExceeded;
45 }
46
47 function getLocalStorage(key) {
48 var exp = 60 * 60 * 24; // 一天的秒数
49 if(localStorage.getItem(key)) {
50 var vals = localStorage.getItem(key); // 获取本地存储的值
51 var dataObj = JSON.parse(vals); // 将字符串转换成JSON对象
52 // 如果(当前时间 - 存储的元素在创建时候设置的时间) > 过期时间
53 var isTimed = (new Date().getTime() - dataObj.timer) > exp;
54 if(isTimed) {
55 console.log("存储已过期");
56 localStorage.removeItem(key);
57 return null;
58 } else {
59 var newValue = dataObj.val;
60 }
61 return newValue;
62 } else {
63 return null;
64 }
65 }
66
67 setLocalStorage('name', 'hello, world');
68 var localKey = getLocalStorage('name');
69 console.log(localKey);
