		{
		"name": "calculate-asmd",
		"version": "2.0.0",
		"description": "加减乘除四则运算(calculate/arithmetic)",
		"main": "index.js",
		"author": "sanshuiwang",
		"license": "MIT",
		"version": "2.2.2",
		"description": "calculate/arithmetic",
		"scripts": {
		"test": "node ./test/test.js"
		"start": "umi-lib doc dev",
		"doc": "umi-lib doc build && cpx docs/404.html .docz/dist/ && umi-lib doc deploy",
		"build": "umi-lib build",
		"prepare": "yarn run build",
		"test": "yarn run build && mocha"
		},
		"main": "dist/index.js",
		"module": "dist/index.esm.js",
		"jsnext:main": "dist/index.esm.js",
		"typings": "dist/index.d.ts",
		"sideEffects": false,
		"repository": {
		@@ -15,10 +21,29 @@ "type": "git",
		},
		"files": [
		"src",
		"dist"
		],
		"keywords": [
		"calculate",
		"arithmetic"
		"axios",
		"last"
		],
		"author": "WangYang",
		"license": "MIT",
		"bugs": {
		"url": "https://github.com/sanshuiwang/calculate-asmd/issues"
		},
		"homepage": "https://github.com/sanshuiwang/calculate-asmd#readme"
		"homepage": "https://github.com/sanshuiwang/calculate-asmd#readme",
		"devDependencies": {
		"chai": "^4.2.0",
		"cpx": "^1.5.0",
		"docz-plugin-splash": "^1.0.1",
		"eslint": "^5.15.3",
		"eslint-config-airbnb-base": "^13.1.0",
		"eslint-plugin-import": "^2.16.0",
		"mocha": "^6.0.2",
		"nock": "^10.0.6",
		"typescript": "^3.3.4000",
		"umi-library": "^1.4.1"
		},
		"peerDependencies": {}
		}

README.md

		# calculate-asmd

		<h3>javascript 精确四则运算</h3>
		<h3>JavaScript Arithmetic</h3>

		> 生产原因
		> Production

		1. 浮点数值的最高进度是 17 位小数，但在进行运算的时候其精确度却远远不如整数；整数在进行运算的时候都会转成 10 进制。
		2. Java 和 JavaScript 中计算小数运算时，都会先将十进制的小数换算到对应的二进制，一部分小数并不能完整的换算为二进制，这里就出现了第一次的误差。
		3. 待小数都换算为二进制后，再进行二进制间的运算，得到二进制结果。然后再将二进制结果换算为十进制，这里通常会出现第二次的误差。
		[0.2 + 0.4 = 0.6 ？](https://github.com/sanshuiwang/Blog/issues/9)

		> 使用
		> Usage

		<h4>安装</h4>
		<h4>Install</h4>

		@@ -26,25 +24,38 @@ `yarn add calculate-asmd --dev`

		/** 加法 */
		const addNum = add(9.9, 0.2);
		console.log("add: ", addNum);
		const addNum = add(0.2, 0.4);
		console.log("add(0.2, 0.4): ", addNum);
		const addNegative = add(0.2, -0.4);
		console.log("add(0.2, -0.4): ", addNegative);
		/**
		*add(0.2, 0.4): 0.6
		*add(0.2, -0.4): -0.2
		*/

		/** 减法 */
		const subNum = sub(9.9, 0.2);
		console.log("sub: ", subNum);
		const subNum = sub(0.2, 0.4);
		console.log("sub(0.2, 0.4): ", subNum);
		const subNegative = sub(0.2, -0.4);
		console.log("sub(0.2, -0.4): ", subNegative);
		/**
		*sub(0.2, 0.4): -0.2
		*sub(0.2, -0.4): 0.6
		*/

		/** 乘法 */
		const mulNum = mul(9.9, 0.2);
		console.log("mul: ", mulNum);
		const mulNum = mul(0.57, 100);
		console.log("mul(0.57, 100): ", mulNum);
		const mulNegativ = mul(-0.57, 100);
		console.log("mul(-0.57, 100): ", mulNegativ);
		/**
		*mul(0.57, 100): 57
		*mul(-0.57, 100): -57
		*/

		/** 除法 */
		const divNum = div(9.9, 0.2);
		console.log("div: ", divNum);
		const divNum = div(0.57, 100);
		console.log("div(0.57, 100): ", divNum);
		const divNegative = div(-0.57, 100);
		console.log("div(-0.57, 100): ", divNegative);
		/**
		*div(0.57, 100): 0.0057
		*div(-0.57, 100): -0.0057
		*/

		```

		> 参考

		[精确四则运算](https://blog.csdn.net/u010004317/article/details/79009172)

		[js 小数运算出现多位小数如何解决
		](http://www.cnblogs.com/zdz8207/p/js-number-tofixed.html)

index.js

test/test.js

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