feat: 前端计算值

imondo · Jan 15, 2021 · 5cdafc9 · 5cdafc9
1 parent 69b8785
commit 5cdafc9
Show file tree

Hide file tree

Showing 3 changed files with 105 additions and 0 deletions.
diff --git a/bigJs/README.md b/bigJs/README.md
@@ -0,0 +1,26 @@
+# 简单的计算
+
+依赖 [bigJs](https://github.com/MikeMcl/big.js/)
+
+只做简单的封装
+
+```html
+<script src='https://cdn.jsdelivr.net/npm/[email protected]/big.min.js'></script>
+<script src="./algor.js"></script>
+```
+
+```js
+const $algor = new FedAlgor();
+console.log('加法: ', $algor.plus(5, 4)) // 9
+console.log('减法: ', $algor.minus('0.3', 0.1)) // 0.2
+console.log('乘法: ', $algor.times(4, 2)) // 8
+console.log('除法: ', $algor.div(1, 34, 7)) // 0.0294118
+console.log('toFixed: ', $algor.toFixed(0.555, 2)) // 0.56
+
+// 添加自定义方法
+FedAlgor.prototype.mult = function(a, b) {
+  return 'mult'
+}
+
+console.log($algor)
+```
diff --git a/bigJs/algor.js b/bigJs/algor.js
@@ -0,0 +1,53 @@
+;(function(window) {
+
+  function logWarn(res, len, callback) {
+    if (res.c) {
+      if (len) {
+        return callback(res, len)
+      }
+      return res.valueOf();
+    } else {
+      console.warn(`结果不存在`);
+    }
+  }
+
+  function FedAlgor() {
+    // 加法
+    this.plus = function(a, b, len) {
+      var _a = new Big(+a);
+      var res = _a.plus(b);
+      return logWarn(res, len, this.toFixed);
+    }
+    // 减法
+    this.minus = function(a, b, len) {
+      var _a = new Big(a);
+      var res = _a.minus(b);
+      return logWarn(res, len, this.toFixed);
+    }
+    // 乘法
+    this.times = function(a, b, len) {
+      var _a = new Big(a);
+      var res = _a.times(b);
+      return logWarn(res, len, this.toFixed);
+    }
+    // 除法
+    this.div = function(a, b, len) {
+      var _a = new Big(a);
+      var res = _a.div(b);
+      return logWarn(res, len, this.toFixed);
+    }
+
+    // toFixed
+    this.toFixed = function(num, len = 2) {
+      var _num = new Big(num);
+      return _num.toFixed(len).valueOf();
+    }
+  }
+
+  if (typeof module === "object" && module && typeof module.exports === "object") {
+    module.exports = FedAlgor;
+  } else {
+    window.FedAlgor = window.__FedAlgor = FedAlgor;
+  }
+
+})(window)
diff --git a/bigJs/index.html b/bigJs/index.html
@@ -0,0 +1,26 @@
+<!DOCTYPE html>
+<html lang="en">
+<head>
+  <meta charset="UTF-8">
+  <meta name="viewport" content="width=device-width, initial-scale=1.0">
+  <title>前端数值计算</title>
+</head>
+<body>
+  <script src='https://cdn.jsdelivr.net/npm/[email protected]/big.min.js'></script>
+  <script src="./algor.js"></script>
+  <script>
+    const $algor = new FedAlgor();
+    console.log('加法: ', $algor.plus(5, 4))
+    console.log('减法: ', $algor.minus('0.3', 0.1))
+    console.log('乘法: ', $algor.times(4, 2))
+    console.log('除法: ', $algor.div(1, 34, 7))
+    console.log('toFixed: ', $algor.toFixed(0.555, 2))
+
+    // 添加自定义方法
+    FedAlgor.prototype.mult = function(a, b) {
+      console.log(11);
+      return 'mult'
+    }
+  </script>
+</body>
+</html>