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39 lines
820 B
39 lines
820 B
3 years ago
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/**
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* @description: utf8to16
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* @param {String} str
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* @return {String}
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*/
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export default function utf8to16(str) {
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var out, i, len, c;
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var char2, char3;
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out = '';
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len = str.length;
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i = 0;
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while (i < len) {
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c = str.charCodeAt(i++);
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switch (c >> 4) {
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case 0:
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case 1:
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case 2:
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case 3:
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case 4:
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case 5:
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case 6:
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case 7:
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out += str.charAt(i - 1);
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break;
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case 12:
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case 13:
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char2 = str.charCodeAt(i++);
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out += String.fromCharCode(((c & 0x1f) << 6) | (char2 & 0x3f));
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break;
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case 14:
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char2 = str.charCodeAt(i++);
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char3 = str.charCodeAt(i++);
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out += String.fromCharCode(((c & 0x0f) << 12) | ((char2 & 0x3f) << 6) | ((char3 & 0x3f) << 0));
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break;
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}
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}
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return out;
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}
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