npm小工具之工具包

这是我参与8月更文挑战的第12天，活动详情查看：8月更文挑战

文件路径 npm init一个package.json文件

package.json:

{
 "name": "sybase-util",
 "version": "1.0.5",
 "description": "",
 "main": "index.js",
 "scripts": {
   "test": "echo \"Error: no test specified\" && exit 1"
 },
 "author": "",
 "license": "ISC"
}

工具类Index文件

export function isEmpty(v) {
   switch (typeof v) {
       case 'undefined':
           return true;
       case 'string':
           if (v.replace(/(^[ \t\n\r]*)|([ \t\n\r]*$)/g, '').length == 0) return true;
           break;
       case 'boolean':
           if (!v) return true;
           break;
       case 'number':
           if (0 === v || isNaN(v)) return true;
           break;
       case 'object':
           if (null === v || v.length === 0) return true;
           for (var i in v) {
               return false;
           }
           return true;
   }
   return false;
}

引用： 首先安装该工具类：npm install sybase-util

然后在页面中使用该方法：

const sybase = require("sybase-util"); sybase.isEmpty(null)

也可以挂载到window对象上去，如下：

import Storage from 'web-storage-cache'

(function () {
    var syUtiles = syUtiles || {};

    const localStorage = new Storage();

    syUtiles.commonUtils = {
        /**
         * @Desc: 判断值为空 undefined、 null、 ''、 NaN、false、0、[]、{} 、空白字符串 ,null的字符串，这些都返回true
         * @Date: 2020-09-07 18:40:29
         * @param {type} 
         * @return {type} 
         */
        isEmpty: function (v) {
            switch (typeof v) {
                case 'undefined':
                    return true;
                case 'string':
                    if (v.replace(/(^[ \t\n\r]*)|([ \t\n\r]*$)/g, '').length == 0||v.indexOf('null')!=-1) return true;
                    break;
                case 'boolean':
                    if (!v) return true;
                    break;
                case 'number':
                    if (0 === v || isNaN(v)) return true;
                    break;
                case 'object':
                    if (null === v || v.length === 0) return true;
                    for (var i in v) {
                        return false;
                    }
                    return true;
            }
            return false;
        },
        /**
         * @Desc:  两个浮点数求和
         * @Date: 2020-09-07 18:41:34
         * @param {type} 
         * @return {type} 
         */
        accAdd: function (num1, num2) {
            var r1, r2, m;
            try {
                r1 = num1.toString().split('.')[1].length;
            } catch (e) {
                r1 = 0;
            }
            try {
                r2 = num2.toString().split(".")[1].length;
            } catch (e) {
                r2 = 0;
            }
            m = Math.pow(10, Math.max(r1, r2));
            // return (num1*m+num2*m)/m;
            return Math.round(num1 * m + num2 * m) / m;
        },
        /**
         * @Desc: 两个浮点数相减
         * @Date: 2020-09-07 18:41:42
         * @param {type} 
         * @return {type} 
         */
        accSub: function (num1, num2) {
            var r1, r2, m;
            try {
                r1 = num1.toString().split('.')[1].length;
            } catch (e) {
                r1 = 0;
            }
            try {
                r2 = num2.toString().split(".")[1].length;
            } catch (e) {
                r2 = 0;
            }
            m = Math.pow(10, Math.max(r1, r2));
            n = (r1 >= r2) ? r1 : r2;
            return (Math.round(num1 * m - num2 * m) / m).toFixed(n);
        },
        /**
         * @Desc:  两个浮点数相除
         * @Date: 2020-09-07 18:41:42
         * @param {type} 
         * @return {type} 
         */
        accDiv: function (num1, num2) {
            var t1, t2, r1, r2;
            try {
                t1 = num1.toString().split('.')[1].length;
            } catch (e) {
                t1 = 0;
            }
            try {
                t2 = num2.toString().split(".")[1].length;
            } catch (e) {
                t2 = 0;
            }
            r1 = Number(num1.toString().replace(".", ""));
            r2 = Number(num2.toString().replace(".", ""));
            return (r1 / r2) * Math.pow(10, t2 - t1);
        },
        /**
         * @Desc:  两个浮点数相乘
         * @Date: 2020-09-07 18:41:42
         * @param {type} 
         * @return {type} 
         */
        accMul: function () {
            var m = 0, s1 = num1.toString(), s2 = num2.toString();
            try { m += s1.split(".")[1].length } catch (e) { };
            try { m += s2.split(".")[1].length } catch (e) { };
            return Number(s1.replace(".", "")) * Number(s2.replace(".", "")) / Math.pow(10, m);
        }
    },
        syUtiles.localStorage = {
            //localStorage的封装

            setLocalStorage: function (key, value) {
                return localStorage.set(key, value);
            },

            getLocalStorage: function (key) {
                return localStorage.get(key);
            },

            removeLocalStorage: function (key) {
                return localStorage.delete(key);
            },

            //全部清空
            clearLocalStorage: function () {
                return localStorage.clear();
            }

        }

    //暴露给window
    window['syUtiles'] = syUtiles;
})();

这样的话就可以直接syUtiles.commonUtils.isEmpty('null')这样使用了。