diff --git a/packages/input-number/package.json b/packages/input-number/package.json
index 22a9863c..78a75286 100644
--- a/packages/input-number/package.json
+++ b/packages/input-number/package.json
@@ -41,7 +41,8 @@
     "@svelement-ui/input": "workspace:^",
     "@svelement-ui/theme-chalk": "workspace:^",
     "@svelement-ui/util-array-2-class-string": "workspace:^",
-    "@svelement-ui/util-array-2-style-string": "workspace:^"
+    "@svelement-ui/util-array-2-style-string": "workspace:^",
+    "@svelement-ui/utils": "workspace:^"
   },
   "repository": {
     "type": "git",
diff --git a/packages/input-number/src/lib/input-number.svelte b/packages/input-number/src/lib/input-number.svelte
index f8dab73f..61cb74c9 100644
--- a/packages/input-number/src/lib/input-number.svelte
+++ b/packages/input-number/src/lib/input-number.svelte
@@ -2,6 +2,7 @@
   import a2s from '@svelement-ui/util-array-2-class-string';
   import a2st from '@svelement-ui/util-array-2-style-string';
   import { createEventDispatcher, onMount, tick } from 'svelte';
+  import { isNull, isNumber, isUndefined } from '@svelement-ui/utils';
   import { SvelIcon, ArrowDown, Minus, ArrowUp, Plus } from '@svelement-ui/icon';
   import SvelInput from '@svelement-ui/input';
 
@@ -30,12 +31,14 @@
       return dataUserInput;
     }
     let currentValue = dataCurrentValue;
-    if (currentValue === undefined || currentValue === null) {
+    if (isNull(currentValue)) {
       return '';
     }
-    // todo:
-    if (Object.prototype.toString.call(currentValue).toLowerCase() === '') {
-      currentValue = currentValue.toFixed(precision);
+    if (isNumber(currentValue)) {
+      if (Number.isNaN(currentValue)) return '';
+      if (!isUndefined(precision)) {
+        currentValue = currentValue.toFixed(precision);
+      }
     }
     return currentValue;
   }
diff --git a/packages/utils/.gitignore b/packages/utils/.gitignore
new file mode 100644
index 00000000..a547bf36
--- /dev/null
+++ b/packages/utils/.gitignore
@@ -0,0 +1,24 @@
+# Logs
+logs
+*.log
+npm-debug.log*
+yarn-debug.log*
+yarn-error.log*
+pnpm-debug.log*
+lerna-debug.log*
+
+node_modules
+dist
+dist-ssr
+*.local
+
+# Editor directories and files
+.vscode/*
+!.vscode/extensions.json
+.idea
+.DS_Store
+*.suo
+*.ntvs*
+*.njsproj
+*.sln
+*.sw?
diff --git a/packages/utils/CHANGELOG.md b/packages/utils/CHANGELOG.md
new file mode 100644
index 00000000..b0f3e7dc
--- /dev/null
+++ b/packages/utils/CHANGELOG.md
@@ -0,0 +1,132 @@
+# Change Log
+
+All notable changes to this project will be documented in this file.
+See [Conventional Commits](https://conventionalcommits.org) for commit guidelines.
+
+# [0.18.0](https://github.com/koory1st/svelement-ui/compare/v0.17.10...v0.18.0) (2023-11-20)
+
+**Note:** Version bump only for package @svelement-ui/util-errors
+
+## [0.17.10](https://github.com/koory1st/svelement-ui/compare/v0.17.9...v0.17.10) (2023-11-15)
+
+### Bug Fixes
+
+* **input:** textarea style ([c9e4ebc](https://github.com/koory1st/svelement-ui/commit/c9e4ebc35fd4e589010091d3e409609bb9a4d5d7))
+
+# [0.17.0](https://github.com/koory1st/svelement-ui/compare/v0.16.1...v0.17.0) (2023-11-05)
+
+**Note:** Version bump only for package @svelement-ui/util-errors
+
+# [0.16.0](https://github.com/koory1st/svelement-ui/compare/v0.15.8...v0.16.0) (2023-10-28)
+
+**Note:** Version bump only for package @svelement-ui/util-errors
+
+# [0.15.0](https://github.com/koory1st/svelement-ui/compare/v0.14.4...v0.15.0) (2023-10-13)
+
+**Note:** Version bump only for package @svelement-ui/util-errors
+
+# [0.14.0](https://github.com/koory1st/svelement-ui/compare/v0.13.12...v0.14.0) (2023-10-06)
+
+**Note:** Version bump only for package @svelement-ui/util-errors
+
+## [0.13.12](https://github.com/koory1st/svelement-ui/compare/v0.13.11...v0.13.12) (2023-10-06)
+
+**Note:** Version bump only for package @svelement-ui/util-errors
+
+# [0.13.0](https://github.com/koory1st/svelement-ui/compare/v0.12.8...v0.13.0) (2023-09-28)
+
+**Note:** Version bump only for package @svelement-ui/util-errors
+
+# [0.12.0](https://github.com/koory1st/svelement-ui/compare/v0.11.7...v0.12.0) (2023-09-18)
+
+**Note:** Version bump only for package @svelement-ui/util-errors
+
+# [0.11.0](https://github.com/koory1st/svelement-ui/compare/v0.10.8...v0.11.0) (2023-09-11)
+
+**Note:** Version bump only for package @svelement-ui/util-errors
+
+# [0.10.0](https://github.com/koory1st/svelement-ui/compare/v0.9.15...v0.10.0) (2023-09-05)
+
+**Note:** Version bump only for package @svelement-ui/util-errors
+
+## [0.9.15](https://github.com/koory1st/svelement-ui/compare/v0.9.14...v0.9.15) (2023-09-04)
+
+**Note:** Version bump only for package @svelement-ui/util-errors
+
+## [0.9.13](https://github.com/koory1st/svelement-ui/compare/v0.9.12...v0.9.13) (2023-08-30)
+
+**Note:** Version bump only for package @svelement-ui/util-errors
+
+## [0.9.11](https://github.com/koory1st/svelement-ui/compare/v0.9.10...v0.9.11) (2023-08-27)
+
+**Note:** Version bump only for package @svelement-ui/util-errors
+
+## [0.9.10](https://github.com/koory1st/svelement-ui/compare/v0.9.9...v0.9.10) (2023-08-27)
+
+**Note:** Version bump only for package @svelement-ui/util-errors
+
+## [0.9.9](https://github.com/koory1st/svelement-ui/compare/v0.9.8...v0.9.9) (2023-08-26)
+
+**Note:** Version bump only for package @svelement-ui/util-errors
+
+## [0.9.8](https://github.com/koory1st/svelement-ui/compare/v0.9.7...v0.9.8) (2023-08-26)
+
+### Bug Fixes
+
+* **ts:** add check ([fa5491b](https://github.com/koory1st/svelement-ui/commit/fa5491bd2e536d48143c922e3d00876b30fdeb58))
+
+## [0.9.5](https://github.com/koory1st/svelement-ui/compare/v0.9.4...v0.9.5) (2023-08-25)
+
+### Bug Fixes
+
+* **package:** add pulish config ([f341c6a](https://github.com/koory1st/svelement-ui/commit/f341c6acb368908716a745d6d2e0d534202a54c9))
+
+## [0.9.4](https://github.com/koory1st/svelement-ui/compare/v0.9.3...v0.9.4) (2023-08-25)
+
+**Note:** Version bump only for package @svelement-ui/util-errors
+
+## [0.9.3](https://github.com/koory1st/svelement-ui/compare/v0.9.2...v0.9.3) (2023-08-25)
+
+**Note:** Version bump only for package @svelement-ui/util-errors
+
+# [0.9.0](https://github.com/koory1st/svelement-ui/compare/v0.8.5...v0.9.0) (2023-08-20)
+
+**Note:** Version bump only for package @svelement-ui/util-errors
+
+## [0.8.3](https://github.com/koory1st/svelement-ui/compare/v0.8.2...v0.8.3) (2023-08-18)
+
+**Note:** Version bump only for package @svelement-ui/util-errors
+
+# [0.8.0](https://github.com/koory1st/svelement-ui/compare/v0.7.2...v0.8.0) (2023-08-16)
+
+**Note:** Version bump only for package @svelement-ui/util-errors
+
+## [0.7.2](https://github.com/koory1st/svelement-ui/compare/v0.7.1...v0.7.2) (2023-08-15)
+
+**Note:** Version bump only for package @svelement-ui/util-errors
+
+# [0.7.0](https://github.com/koory1st/svelement-ui/compare/v0.6.1...v0.7.0) (2023-08-13)
+
+**Note:** Version bump only for package @svelement-ui/util-errors
+
+# [0.6.0](https://github.com/koory1st/svelement-ui/compare/v0.5.0...v0.6.0) (2023-08-13)
+
+**Note:** Version bump only for package @svelement-ui/util-errors
+
+# [0.5.0](https://github.com/koory1st/svelement-ui/compare/v0.4.3...v0.5.0) (2023-08-12)
+
+**Note:** Version bump only for package @svelement-ui/util-errors
+
+## [0.4.3](https://github.com/koory1st/svelement-ui/compare/v0.4.1...v0.4.3) (2023-08-11)
+
+**Note:** Version bump only for package @svelement-ui/util-errors
+
+# [0.4.0](https://github.com/koory1st/svelement-ui/compare/v0.3.0...v0.4.0) (2023-08-09)
+
+**Note:** Version bump only for package @svelement-ui/util-errors
+
+# [0.3.0](https://github.com/koory1st/svelement-ui/compare/v0.2.1...v0.3.0) (2023-08-08)
+
+### Features
+
+* **util-errors:** add ([b03bfe5](https://github.com/koory1st/svelement-ui/commit/b03bfe5519e013bf4097b025896feed1a29a19d7))
diff --git a/packages/utils/package.json b/packages/utils/package.json
new file mode 100644
index 00000000..5c2dd8b7
--- /dev/null
+++ b/packages/utils/package.json
@@ -0,0 +1,22 @@
+{
+  "name": "@svelement-ui/utils",
+  "version": "0.18.0",
+  "type": "module",
+  "files": [
+    "dist"
+  ],
+  "exports": {
+    ".": {
+      "types": "./dist/index.d.ts",
+      "default": "./dist/index.js"
+    }
+  },
+  "scripts": {
+    "build": "vite build",
+    "clean": "rimraf dist"
+  },
+  "publishConfig": {
+    "access": "public",
+    "registry": "https://registry.npmjs.org"
+  }
+}
diff --git a/packages/utils/src/index.js b/packages/utils/src/index.js
new file mode 100644
index 00000000..855995c6
--- /dev/null
+++ b/packages/utils/src/index.js
@@ -0,0 +1,2 @@
+export { isNull } from './is_null.js';
+export { isNumber } from './is_number.js';
diff --git a/packages/utils/src/is_null.js b/packages/utils/src/is_null.js
new file mode 100644
index 00000000..9abe5248
--- /dev/null
+++ b/packages/utils/src/is_null.js
@@ -0,0 +1,11 @@
+export function isNull(input) {
+  if (input === null) {
+    return true;
+  }
+
+  if (input === undefined) {
+    return true;
+  }
+
+  return false;
+}
diff --git a/packages/utils/src/is_number.js b/packages/utils/src/is_number.js
new file mode 100644
index 00000000..743916f6
--- /dev/null
+++ b/packages/utils/src/is_number.js
@@ -0,0 +1,3 @@
+export function isNumber(input) {
+  return typeof input === 'number';
+}
diff --git a/packages/utils/src/is_undefined.js b/packages/utils/src/is_undefined.js
new file mode 100644
index 00000000..e5e30ee2
--- /dev/null
+++ b/packages/utils/src/is_undefined.js
@@ -0,0 +1,3 @@
+export function isUndefined(input) {
+  return input === undefined;
+}
diff --git a/packages/utils/tsconfig.json b/packages/utils/tsconfig.json
new file mode 100644
index 00000000..ef8ffdbc
--- /dev/null
+++ b/packages/utils/tsconfig.json
@@ -0,0 +1,23 @@
+{
+  "compilerOptions": {
+    "target": "ES2020",
+    "useDefineForClassFields": true,
+    "module": "ESNext",
+    "lib": ["ES2020", "DOM", "DOM.Iterable"],
+    "skipLibCheck": true,
+    /* Bundler mode */
+    "moduleResolution": "bundler",
+    "allowImportingTsExtensions": true,
+    "resolveJsonModule": true,
+    "isolatedModules": true,
+    /* Linting */
+    "strict": true,
+    "noUnusedLocals": true,
+    "noUnusedParameters": true,
+    "noFallthroughCasesInSwitch": true,
+    "emitDeclarationOnly": true, // 只输出声明文件(ts 产物)
+    "declaration": true, // 自动生成声明文件
+    "declarationDir": "dist" // 声明文件生成的目录
+  },
+  "include": ["src"]
+}
diff --git a/packages/utils/vite.config.js b/packages/utils/vite.config.js
new file mode 100644
index 00000000..2172dc60
--- /dev/null
+++ b/packages/utils/vite.config.js
@@ -0,0 +1,12 @@
+import { defineConfig } from 'vite';
+import { resolve } from 'path';
+
+export default defineConfig({
+  build: {
+    lib: {
+      entry: resolve(__dirname, 'src/index.js'),
+      name: 'index',
+      fileName: 'index',
+    },
+  },
+});
diff --git a/pnpm-lock.yaml b/pnpm-lock.yaml
index 6abd3936..17c1ea9c 100644
--- a/pnpm-lock.yaml
+++ b/pnpm-lock.yaml
@@ -271,6 +271,9 @@ importers:
       '@svelement-ui/util-array-2-style-string':
         specifier: workspace:^
         version: link:../util-array-2-style-string
+      '@svelement-ui/utils':
+        specifier: workspace:^
+        version: link:../utils
 
   packages/layout:
     devDependencies:
@@ -344,6 +347,8 @@ importers:
 
   packages/util-errors: {}
 
+  packages/utils: {}
+
   packages/vite-plugin-prismjs:
     dependencies:
       '@babel/core':