文章内容
1、字符串转字节
01 02 03 04 05 06 07 08 09 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 | function stringToByte(str) {var bytes = new Array();var len, c;len = str.length;for(var i = 0; i < len; i++) {c = str.charCodeAt(i);if(c >= 0x010000 && c <= 0x10FFFF) {bytes.push(((c >> 18) & 0x07) | 0xF0);bytes.push(((c >> 12) & 0x3F) | 0x80);bytes.push(((c >> 6) & 0x3F) | 0x80);bytes.push((c & 0x3F) | 0x80);} else if(c >= 0x000800 && c <= 0x00FFFF) {bytes.push(((c >> 12) & 0x0F) | 0xE0);bytes.push(((c >> 6) & 0x3F) | 0x80);bytes.push((c & 0x3F) | 0x80);} else if(c >= 0x000080 && c <= 0x0007FF) {bytes.push(((c >> 6) & 0x1F) | 0xC0);bytes.push((c & 0x3F) | 0x80);} else {bytes.push(c & 0xFF);}}return bytes;} |
2、字节转字符串
01 02 03 04 05 06 07 08 09 10 11 12 13 14 15 16 17 18 19 20 21 22 23 | function byteToString(arr) {if(typeof arr === 'string') {return arr;}var str = '',_arr = arr;for(var i = 0; i < _arr.length; i++) {var one = _arr[i].toString(2),v = one.match(/^1+?(?=0)/);if(v && one.length == 8) {var bytesLength = v[0].length;var store = _arr[i].toString(2).slice(7 - bytesLength);for(var st = 1; st < bytesLength; st++) {store += _arr[st + i].toString(2).slice(2);}str += String.fromCharCode(parseInt(store, 2));i += bytesLength - 1;} else {str += String.fromCharCode(_arr[i]);}}return str;} |