数据类型判断和数据类型转换

var utils ={};var typeMap = {
        ‘[object Null]‘: ‘null‘,
        ‘[object Undefined]‘: ‘undefined‘,
        ‘[object String]‘: ‘string‘,
        ‘[object Number]‘: ‘number‘,
        ‘[object Boolean]‘: ‘boolean‘,
        ‘[object Function]‘: ‘function‘,
        ‘[object Date]‘: ‘date‘,
        ‘[object Array]‘: ‘array‘,
        ‘[object Object]‘: ‘object‘,
    };
    utils.dataType = function (data) {
        return typeMap[Object.prototype.toString.call(data)];
    };
    //是否为数组
    utils.isArray = function (arr) {
        return this.isFunction(Array.isArray) ? Array.isArray(arr) : this.dataType(arr) == ‘array‘;
    };

    //是否为undefined
    utils.isUndefined = function (arr) {
        return typeof arr == ‘undefined‘;
    };

    //是否为function
    utils.isFunction = function (func) {
        return typeof func == ‘function‘;
    };

    /**
     * 数组转obj
     * arr 转换的数组
     * deepTranslate  是否深转换
     * */
    utils.arrayToObj = function (arr, deepTranslate) {
        var obj = {};
        deepTranslate = deepTranslate || false;
        if (this.isArray(arr) && arr.length > 0) {
            for (var i = 0, len = arr.length; i < len; i++) {
                var _arr = arr[i];
                if (typeof _arr == ‘object‘) {
                    if (this.isArray(_arr)) {
                        var _obj = {};
                        var len = _arr.length;
                        if (deepTranslate) {
                            for (var j = 0; j < len; j++) {
                                _obj[j] = (this.arrayToObj(_arr[j]));
                            }
                        }
                        else {
                            _obj = _arr;
                        }
                        obj[i] = _obj;
                    }
                    else if (_arr == null) {
                        obj[i] = _arr;
                    }
                    else {
                        if (this.isUndefined(_arr.k)) {
                            obj[k] = _arr.v;
                        }
                        else if (this.isUndefined(_arr.key)) {
                            obj[key] = _arr.value;
                        }
                        else {
                            obj[i] = _arr;
                        }
                    }
                }
                else {
                    obj[i] = arr[i];
                }
            }
        }
        return obj;
    };
 /**
     * 数据合并
     * arg_0 合并后被修改数据
     * arg_1 合并原数据
     * deepClone  是否深克隆
     * */
    utils.dataCombine = function (arg_0, arg_1, deepClone) {
        deepClone = deepClone || false;
        arg_0 = arg_0 || {};
        for (var item in arg_1) {
            if (arg_1.hasOwnProperty(item)) {
                var copy = arg_1[item];
                if (deepClone && this.isArray(copy)) {
                    arg_0[item] = this.dataCombine([], arg_1[item], deepClone);
                }
                else if (deepClone && this.dataType(copy) == ‘object‘) {
                    arg_0[item] = this.dataCombine({}, arg_1[item], deepClone);
                }
                else if (copy !== undefined) {
                    arg_0[item] = copy;
                }
            }
        }
        return arg_0;
    };

    /**
     * 数据克隆
     * arg_1 克隆复制原数据
     * deepClone  是否深克隆
     * */
    utils.clone = function (arg_1, deepClone) {
        deepClone = deepClone || false;
        var arg_0 = this.isArray(arg_1) ? [] : {};
        for (var item in arg_1) {
            if (arg_1.hasOwnProperty(item)) {
                var copy = arg_1[item];
                if (deepClone && this.isArray(copy)) {
                    arg_0[item] = this.clone(arg_1[item], deepClone);
                }
                else if (deepClone && this.dataType(copy) == ‘object‘) {
                    arg_0[item] = this.clone(arg_1[item], deepClone);
                }
                else if (copy !== undefined) {
                    arg_0[item] = copy;
                }
            }
        }
        return arg_0;
    };

    /**
     * URL解析
     * url  地址
     * */
    utils.getUrlParams = function (url) {
        url = url || window.location.search; //获取url中"?"符后的字串
        var params = {};
        if (url.indexOf("?") != -1) {
            var str = url.split("?")[1];
            var strArr = str.split("&");
            for (var i = 0; i < strArr.length; i++) {
                var tmpArr = strArr[i].split("=");
                params[tmpArr[0]] = decodeURIComponent(tmpArr[1]);
            }
        }
        return params;
    };

    utils.obj2query = function (obj) {
        var __str = "";
        if (typeof obj == "object") {
            var __arr = [];
            for (var item in obj) {
                //modify xuelong .这里不考虑 hasOwnProperty,因为在重庆的盒子上不支持， 所以这里修改成只要是 str 与number 都拼接的模式
                if (typeof obj[item] === "string" || typeof obj[item] === "number") {
                    __arr.push(item + "=" + encodeURIComponent(obj[item]));
                }
            }
            __str = __arr.join("&");
        }
        else if (typeof obj === "string" || typeof obj === "number") {
            __str = obj;
        }

        return __str;
    };

    utils.query2obj = function (url) {
        if (url) {
            if (url.indexOf("?") != -1) {
                return utils.getUrlParams(url);
            }
            else {
                return utils.getUrlParams("?" + url);
            }
        }
    };

    /**
     * 占位符补位方法
     * str 初始字符串
     * num 补位后字符串位数
     * zw 占位符 默认为0
     * */
    utils.addZwToStr = function (str, num, zw) {
        var len = str.length;
        num = num || len;
        zw = zw || 0;
        for (var i = 0, _len = Math.max(0, num - len); i < _len; i++) {
            str = zw + ‘‘ + str;
        }
        return str;
    };

    /**
     * 去字符串前后空格方法
     * str 初始字符串
     * */
    utils.trim = function (str) {
        return str.replace(/(^\s*)|(\s*$)/g, "");
    };

    function getFinalStyle($dom, property) {
        var _this = $dom;
        var s;
        if (window.getComputedStyle) {
            s = window.getComputedStyle(_this, null)[property];
        }
        else {
            s = _this.currentStyle[property];
        }
        return s.replace(/[^0-9.]/g, ‘‘);
    }

    function getText($dom) {
        var s;
        if ($dom.innerText) {
            s = $dom.innerText
        }
        else {
            s = $dom.textContent;
        }
        return s;
    }

    function setText($dom, text) {
        if ($dom.innerText) {
            $dom.innerText = text;
        }
        else {
            $dom.textContent = text;
        }
    }

    /**
     *  字符串截取区分中英文的截取。
     * str 初始字符串
     * */
    utils.ellipsis = function ($dom, num) {
        var _d = $dom;
        var _lineH = getFinalStyle(_d, "lineHeight");
        _lineH == 0 && (_lineH = getFinalStyle(_d, "fontSize") * 1.5);//默认按1.5倍设置行高
        var _h = _lineH * num;
        var str = getText(_d);
        while (_h * 3 < getFinalStyle(_d, "height")) {
            setText(_d, str.substring(0, str.length / 2));
            str = getText(_d);
        }
        while (_h < _d.clientHeight) {
            str = getText(_d);
            setText(_d, str.replace(/(\s)*([a-zA-Z0-9]+|\W)(\.\.\.)?$/, "..."));
        }
    };

原文地址：https://www.cnblogs.com/yaoyao-sun/p/10284879.html