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发表于 2020-9-25 23:26:32
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广东省广州市
- var base64hash = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/';
- function atob(s) {
- s = s.replace(/\s|=/g, '');
- var cur, prev, mod, i = 0,
- result = [];
- while (i < s.length) {
- cur = base64hash.indexOf(s.charAt(i));
- mod = i % 4;
- switch (mod) {
- case 0:
- break;
- case 1:
- result.push(String.fromCharCode(prev << 2 | cur >> 4));
- break;
- case 2:
- result.push(String.fromCharCode((prev & 0x0f) << 4 | cur >> 2));
- break;
- case 3:
- result.push(String.fromCharCode((prev & 3) << 6 | cur));
- break
- }
- prev = cur;
- i++
- }
- return result.join('')
- }
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