From 42db20356a605fee9231d1a73460cc8f4cfb08f2 Mon Sep 17 00:00:00 2001
From: xjq <lebnizjoan@gmail.com>
Date: Sat, 3 Dec 2022 02:00:47 +0800
Subject: [PATCH] =?UTF-8?q?feat:=20=E6=96=B0=E5=A2=9E=20=E9=87=91=E9=A2=9D?=
 =?UTF-8?q?=E5=88=A4=E6=96=AD=20=E9=A2=98=E7=9B=AE?=
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---
 question/FrontEnd/isAmount/answer.md  |  9 +++++
 question/FrontEnd/isAmount/answer.mjs |  3 ++
 question/FrontEnd/isAmount/index.md   | 45 +++++++++++++++++++++++++
 question/FrontEnd/isAmount/test.mjs   | 47 +++++++++++++++++++++++++++
 4 files changed, 104 insertions(+)
 create mode 100644 question/FrontEnd/isAmount/answer.md
 create mode 100644 question/FrontEnd/isAmount/answer.mjs
 create mode 100644 question/FrontEnd/isAmount/index.md
 create mode 100644 question/FrontEnd/isAmount/test.mjs

diff --git a/question/FrontEnd/isAmount/answer.md b/question/FrontEnd/isAmount/answer.md
new file mode 100644
index 0000000..6739fb3
--- /dev/null
+++ b/question/FrontEnd/isAmount/answer.md
@@ -0,0 +1,9 @@
+### 方法一
+
+正则表达式
+
+```js
+export default function isAmount(amount) {
+  return /^(0|[1-9]\d*)(\.\d{1,2})?$/.test(amount);
+}
+```
diff --git a/question/FrontEnd/isAmount/answer.mjs b/question/FrontEnd/isAmount/answer.mjs
new file mode 100644
index 0000000..32b998b
--- /dev/null
+++ b/question/FrontEnd/isAmount/answer.mjs
@@ -0,0 +1,3 @@
+export default function isAmount(amount) {
+  return /^(0|[1-9]\d*)(\.\d{1,2})?$/.test(amount);
+}
diff --git a/question/FrontEnd/isAmount/index.md b/question/FrontEnd/isAmount/index.md
new file mode 100644
index 0000000..5072579
--- /dev/null
+++ b/question/FrontEnd/isAmount/index.md
@@ -0,0 +1,45 @@
+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
new file mode 100644
index 0000000..7c72fc1
--- /dev/null
+++ b/question/FrontEnd/isAmount/test.mjs
@@ -0,0 +1,47 @@
+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);
+});