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\"123\"",[1139,1149,1150],{},"最可靠方式。toString() 可指定进制，如 (10).toString(2) \u002F\u002F \"1010\"。",[1118,1152,1153,1156,1159,1166],{},[1139,1154,1155],{},"Number → Array",[1139,1157,1158],{},"String(num).split('')",[1139,1160,1161,1162],{},"let arr = String(123).split(''); \u002F\u002F ",[1163,1164,1165],"span",{},"\"1\", \"2\", \"3\"",[1139,1167,1168],{},"先转为字符串，再按字符拆分成数组（适用于单个数字的位拆分）。",[1118,1170,1171,1174,1177,1180],{},[1139,1172,1173],{},"String → Number",[1139,1175,1176],{},"Number(str) 或 +str 或 parseInt(str, 10)",[1139,1178,1179],{},"let num = Number(\"123\"); \u002F\u002F 123 let num = +\"123\"; \u002F\u002F 123 let num = parseInt(\"123\", 10); \u002F\u002F 123",[1139,1181,1182],{},"+str 最简洁；parseInt 适合提取整数部分（忽略后缀非数字）。",[1118,1184,1185,1188,1191,1199],{},[1139,1186,1187],{},"String → Array",[1139,1189,1190],{},"str.split(separator)",[1139,1192,1193,1194,1196,1197],{},"let arr = \"1,2,3\".split(','); \u002F\u002F ",[1163,1195,1165],{}," let arr = \"123\".split(''); \u002F\u002F ",[1163,1198,1165],{},[1139,1200,1201],{},"split('') 按单个字符拆分；split(',') 按逗号等分隔符拆分。",[1118,1203,1204,1207,1210,1223],{},[1139,1205,1206],{},"Array → String",[1139,1208,1209],{},"arr.toString() 或 arr.join(separator)",[1139,1211,1212,1213,1216,1217,1219,1220,1222],{},"let str = ",[1163,1214,1215],{},"1,2,3",".toString(); \u002F\u002F \"1,2,3\" let str = ",[1163,1218,1215],{},".join(''); \u002F\u002F \"123\" let str = ",[1163,1221,1215],{},".join('-'); \u002F\u002F \"1-2-3\"",[1139,1224,1225],{},"join() 更灵活，可自定义分隔符（默认逗号）。",[1118,1227,1228,1231,1234,1240],{},[1139,1229,1230],{},"Array → Number",[1139,1232,1233],{},"先转为字符串，再转为数字（如 Number(arr.join(''))）",[1139,1235,1236,1237,1239],{},"let num = Number(",[1163,1238,1215],{},".join('')); \u002F\u002F 123",[1139,1241,1242],{},"适用于纯数字数组；若数组含非数字，返回 NaN。",[1118,1244,1245,1248,1251,1259],{},[1139,1246,1247],{},"Array(Number) → Array(String)",[1139,1249,1250],{},"arr.map(String) 或 arr.map(num => num.toString())",[1139,1252,1253,1254,1256,1257],{},"let strArr = ",[1163,1255,1215],{},".map(String); \u002F\u002F ",[1163,1258,1165],{},[1139,1260,1261],{},"逐元素转换为字符串，最常用方法。",[1118,1263,1264,1267,1270,1280],{},[1139,1265,1266],{},"Array(String) → Array(Number)",[1139,1268,1269],{},"arr.map(Number) 或 arr.map(str => parseInt(str, 10))",[1139,1271,1272,1273,1276,1277],{},"let numArr = ",[1163,1274,1275],{},"\"1\",\"2\",\"3\"",".map(Number); \u002F\u002F ",[1163,1278,1279],{},"1, 2, 3",[1139,1281,1282],{},"逐元素转换为数字；parseInt 更安全处理可能含非纯数字字符串。",[1096,1284,1285],{},"数组转数字本质是拼接字符串",[1287,1288,1294],"pre",{"className":1289,"code":1291,"language":1292,"meta":1293},[1290],"language-ts","const arr = [\"2\", \"1\", \"22\", \"23\"];\n\n\u002F\u002F 步骤1: 使用 join('') 无分隔符拼接成字符串 const str = arr.join(''); \u002F\u002F \"212223\"\n\n\u002F\u002F 步骤2: 转换为数字 const num = Number(str); \u002F\u002F 212223 \u002F\u002F 或等价简写：const num = +arr.join('');\n\nconsole.log(num); \u002F\u002F 212223（number 类型）\n","ts","",[1295,1296,1291],"code",{"__ignoreMap":1293},[1096,1298,1299],{},"数组转连续字符串本质也是拼接字符串",[1287,1301,1306],{"className":1302,"code":1304,"language":1305,"meta":1293},[1303],"language-TS","const arr: string[] = ['X', 'W', 'W'];\n\n\u002F\u002F 使用 join('')（最常用）\nconst str: string = arr.join(''); \u002F\u002F \"XWW\"\n\n\u002F\u002F 使用 join() 无参数（默认逗号，但空字符串等价）\nconst str2: string = arr.join(); \u002F\u002F 注意：默认会得到 \"X,W,W\"，必须传空字符串\n","TS",[1295,1307,1304],{"__ignoreMap":1293},[1091,1309,1311],{"id":1310},"字符串反转","字符串反转：",[1096,1313,1314],{},[1099,1315,1316],{},"ES6:",[1287,1318,1321],{"className":1319,"code":1320,"language":1292,"meta":1293},[1290],"const reverseString = (str: string): string => str.split(\"\").reverse().join(\"\");\n\n\u002F\u002F 使用示例\nconsole.log(reverseString(\"hello\")); \u002F\u002F 'olleh'\n",[1295,1322,1320],{"__ignoreMap":1293},[1096,1324,1325,1328],{},[1099,1326,1327],{},"手动循环","（不依赖内置方法）：",[1287,1330,1333],{"className":1331,"code":1332,"language":1305,"meta":1293},[1303],"function reverseString(str) {\n  let reversed = '';\n  for (let i = str.length - 1; i >= 0; i--) {\n    reversed += str[i];\n  }\n  return reversed;\n}\n",[1295,1334,1332],{"__ignoreMap":1293},[1091,1336,1338],{"id":1337},"数组反转array-reverse","数组反转（Array Reverse）:",[1096,1340,1341,1344],{},[1099,1342,1343],{},"原地反转","：",[1287,1346,1349],{"className":1347,"code":1348,"language":1292,"meta":1293},[1290],"const arr = [1, 2, 3, 4];\narr.reverse(); \u002F\u002F arr 变为 [4, 3, 2, 1]\n",[1295,1350,1348],{"__ignoreMap":1293},[1096,1352,1353,1344],{},[1099,1354,1355],{},"手动实现",[1287,1357,1361],{"className":1358,"code":1360,"language":161,"meta":1293},[1359],"language-JavaScript","function reverseArray(arr) {\n  let left = 0, right = arr.length - 1;\n  while (left \u003C right) {\n    [arr[left], arr[right]] = [arr[right], arr[left]];\n    left++;\n    right--;\n  }\n  return arr;\n}\n",[1295,1362,1360],{"__ignoreMap":1293},[1091,1364,1366],{"id":1365},"数字反转leetcode-7","数字反转（leetcode # 7）",[1287,1368,1371],{"className":1369,"code":1370,"language":1292,"meta":1293},[1290],"function reverseInt(x) {\n    const sign = x \u003C 0 ? -1 : 1;\n    const reversed =\n        sign *\n        parseInt(Math.abs(x).toString().split(\"\").reverse().join(\"\"), 10);\n    return reversed;\n}\n",[1295,1372,1370],{"__ignoreMap":1293},[1091,1374,1376],{"id":1375},"补充","补充：",[1096,1378,1379],{},"数组排序",[1287,1381,1384],{"className":1382,"code":1383,"language":1292,"meta":1293},[1290],"nums.sort((a, b) => a - b);\n",[1295,1385,1383],{"__ignoreMap":1293},{"title":1293,"searchDepth":1387,"depth":1387,"links":1388},4,[1389,1391,1392,1393,1394],{"id":1093,"depth":1390,"text":1094},2,{"id":1310,"depth":1390,"text":1311},{"id":1337,"depth":1390,"text":1338},{"id":1365,"depth":1390,"text":1366},{"id":1375,"depth":1390,"text":1376},"md",true,{"uuid":1398,"slots":1399},"d21722c0-e209-11f0-bf51-7b4c8d0f8062",{},{"title":1085,"description":1293},"posts\u002F2025\u002F2025-12-26-JavaScript 数字，数组，字符串的处理",[40,161,185],"eHDDrWB9xUQwTWh8GQy5OhFqFKIBAd3u8oATex6lTAU",1790443287247]