1 function env(strategy) {
2 const _strategy = window[strategy];
3 function getStr(size) {
4 return Array(size + 1).join("1");
5 }
6
7 function test(pieces, size) {
8 let count = 0,
9 piece = pieces.shift(),
10 trySize = size;
11 if (pieces.length) {
12 try {
13 while (true) {
14 trySize = size + (count + 1) * piece;
15 _strategy.setItem(`${strategy}:test`, getStr(trySize));
16 count++;
17 }
18 } catch (err) {
19 return test(pieces, trySize - piece);
20 }
21 } else {
22 let K = size / 2 ** 10,
23 M = K / 2 ** 10;
24 return { K, M };
25 }
26 }
27
28 _strategy.clear();
29
30 const { K, M } = test(
31 [20, 18, 16, 13, 10].map((level) => 2 ** level), // 预估一个存储梯度
32 0,
33 );
34
35 _strategy.clear();
36
37 console.log(`${strategy}大致可存储 ${K}K，合约 ${M}M`);
38 }
39
40 env("localStorage");
41 env("sessionStorage");