快速生码写入txt

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printCodes(mode,len){          // 1: "上单码模式",         // 2: "下单码模式",         // 3: "双码模式",         // 4: "上2下1码模式",         // 5: "上1下2码模式",         // 6: "四码模式",         let code = ''         let start = Date.now()         for(let i = len; i > 0; i--){           let code1 = `https://www.outside.com/${getUUID(18,10)}`           let code2 = `${getUUID(5,61)}`           let code3 = `https://www.inside.com/${getUUID(18,10)}`           let code4 = `${getUUID(5,61)}`           let currentCode = ''           switch(mode){             case 1:               let  desc = i + ''               currentCode = `${code1}\n`               break;             case 2:               currentCode = `${code3}\n`               break;             case 3:               currentCode = `${code1},${code3}\n`               break;             case 4:               currentCode = `${code1}*${code2},${code3}\n`               break;             case 5:               currentCode = `${code1},${code3}*${code4}\n`               break;             case 6:               currentCode = `${code1}*${code2},${code3}*${code4}\n`               break;           }             code += currentCode           if(i % 1000 == 0){             writeLog(code.trim())             code = ''           }            if(code.trim() && i === 1){             writeLog(code.trim())           }         }         let dy =  Date.now() - start         writeLog(`${len}条数据，耗时:${dy}ms`)       }       getUUID(len, radix) {   var chars =     "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz".split("");   var uuid = [];   var i;   radix = radix || chars.length;   if (len) {     for (i = 0; i < len; i++) uuid[i] = chars[0 | (Math.random() * radix)];   } else {     var r;     uuid[8] = uuid[13] = uuid[18] = uuid[23] = "-";     uuid[14] = "4";     for (i = 0; i < 36; i++) {       if (!uuid[i]) {         r = 0 | (Math.random() * 16);         uuid[i] = chars[i === 19 ? (r & 0x3) | 0x8 : r];       }     }   }   return uuid.join(""); }