diff --git a/question/FrontEnd/isAmount/answer.md b/question/FrontEnd/isAmount/answer.md
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+### 方法一
+
+正则表达式
+
+```js
+export default function isAmount(amount) {
+  return /^(0|[1-9]\d*)(\.\d{1,2})?$/.test(amount);
+}
+```
diff --git a/question/FrontEnd/isAmount/answer.mjs b/question/FrontEnd/isAmount/answer.mjs
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+export default function isAmount(amount) {
+  return /^(0|[1-9]\d*)(\.\d{1,2})?$/.test(amount);
+}
diff --git a/question/FrontEnd/isAmount/index.md b/question/FrontEnd/isAmount/index.md
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+金额合法性判断
+
+合法的金额包含整数以及小数点后不超过两位的小数
+
+用例 1:
+
+```js
+const amount = '20';
+isAmount(amount); // true
+```
+
+用例 2:
+
+```js
+const amount = '1.23';
+isAmount(amount); // true
+```
+
+用例 3:
+
+```js
+const amount = '1.';
+isAmount(amount); // false
+```
+
+用例 4:
+
+```js
+const amount = '0.2';
+isAmount(amount); // true
+```
+
+用例 5:
+
+```js
+const amount = '.1';
+isAmount(amount); // false
+```
+
+用例 6:
+
+```js
+const amount = '02';
+isAmount(amount); // false
+```
diff --git a/question/FrontEnd/isAmount/test.mjs b/question/FrontEnd/isAmount/test.mjs
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+++ b/question/FrontEnd/isAmount/test.mjs
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+import isAmount from './answer.mjs';
+import { it } from 'mocha';
+import { assert } from 'chai';
+
+it('用例 1: 输入 1.23', () => {
+  assert.equal(isAmount('1.23'), true);
+});
+
+it('用例 2: 输入 256.23', () => {
+  assert.equal(isAmount('256.23'), true);
+});
+
+it('用例 3: 输入 0.23', () => {
+  assert.equal(isAmount('0.23'), true);
+});
+
+it('用例 4: 输入 0.2', () => {
+  assert.equal(isAmount('0.2'), true);
+});
+
+it('用例 5: 输入 0.234', () => {
+  assert.equal(isAmount('0.234'), false);
+});
+
+it('用例 6: 输入 0.', () => {
+  assert.equal(isAmount('0.'), false);
+});
+
+it('用例 7: 输入 .2', () => {
+  assert.equal(isAmount('.2'), false);
+});
+
+it('用例 8: 输入 20', () => {
+  assert.equal(isAmount('20'), true);
+});
+
+it('用例 9: 输入 02', () => {
+  assert.equal(isAmount('02'), false);
+});
+
+it('用例 10: 输入 102', () => {
+  assert.equal(isAmount('102'), true);
+});
+
+it('用例 11: 输入 102.2', () => {
+  assert.equal(isAmount('102.2'), true);
+});