js -- util

function urlParamToJson(params) {
    var search = params || window.location.search.substring(1);
    return search ? JSON.parse('{"' + search.replace(/&/g, '","').replace(/=/g, '":"') + '"}',
        function (key, value) {
            return key === "" ? value : decodeURIComponent(value)
        }) : {}
}

/**
 * @desc 获取链接参数的值
 * @param  {string} name 参数名字
 * @param  {string} [url] 链接url，为空的时候取location.href
 * @return {string} 参数
 */
function getQueryString(name, url) {
    url = (url == null) ? window.location.href : url;
    url = url.split('#')[0];

    var reg = new RegExp("(^|\\?|&)" + name + "=([^&]*)(\\s|&|$)", "i");
    return reg.test(url) ? RegExp.$2.replace(/\+/g, " ") : '';
}

function addUrlParam(oriUrl, strParamName, strParamValue) {
    var addParam = [strParamName, strParamValue].join('=');
    var reg = /(\?|\#)/;
    var rule = {
        '?': ('?' + addParam + '&'),
        '#': ('?' + addParam + '#'),
        'default': ('?' + addParam)
    };

    if (reg.test(oriUrl)) {
        return oriUrl.replace(reg, function (m, n) {
            return rule[n];
        });
    }
    return oriUrl + rule['default'];
}
function formatDate(format, timestamp) {
    /**
     * example 1: date('H:m:s \\m \\i\\s \\m\\o\\n\\t\\h', 1062402400);
     * returns 1: '09:09:40 m is month'
     * example 2: date('F j, Y, g:i a', 1062462400);
     * returns 2: 'September 2, 2003, 2:26 am'
     * example 3: date('Y W o', 1062462400);
     * returns 3: '2003 36 2003'
     * example 4: x = date('Y m d', (new Date()).getTime()/1000);
     * example 4: (x+'').length == 10 // 2009 01 09
     * returns 4: true
     * example 5: date('W', 1104534000);
     * returns 5: '53'
     * example 6: date('B t', 1104534000);
     * returns 6: '999 31'
     * example 7: date('W U', 1293750000.82); // 2010-12-31
     * returns 7: '52 1293750000'
     * example 8: date('W', 1293836400); // 2011-01-01
     * returns 8: '52'
     * example 9: date('W Y-m-d', 1293974054); // 2011-01-02
     * returns 9: '52 2011-01-02'
     **/

    var that = this;
    var jsdate, f;
    // Keep this here (works, but for code commented-out below for file size reasons)
    // var tal= [];
    var txt_words = [
        'Sun', 'Mon', 'Tues', 'Wednes', 'Thurs', 'Fri', 'Satur',
        'January', 'February', 'March', 'April', 'May', 'June',
        'July', 'August', 'September', 'October', 'November', 'December'
    ];
    // trailing backslash -> (dropped)
    // a backslash followed by any character (including backslash) -> the character
    // empty string -> empty string
    var formatChr = /\\?(.?)/gi;
    var formatChrCb = function(t, s) {
        return f[t] ? f[t]() : s;
    };
    var _pad = function(n, c) {
        n = String(n);
        while (n.length < c) {
            n = '0' + n;
        }
        return n;
    };
    f = {
        // Day
        d: function() {
            // Day of month w/leading 0; 01..31
            return _pad(f.j(), 2);
        },
        D: function() {
            // Shorthand day name; Mon...Sun
            return f.l()
                .slice(0, 3);
        },
        j: function() {
            // Day of month; 1..31
            return jsdate.getDate();
        },
        l: function() {
            // Full day name; Monday...Sunday
            return txt_words[f.w()] + 'day';
        },
        N: function() {
            // ISO-8601 day of week; 1[Mon]..7[Sun]
            return f.w() || 7;
        },
        S: function() {
            // Ordinal suffix for day of month; st, nd, rd, th
            var j = f.j();
            var i = j % 10;
            if (i <= 3 && parseInt((j % 100) / 10, 10) == 1) {
                i = 0;
            }
            return ['st', 'nd', 'rd'][i - 1] || 'th';
        },
        w: function() {
            // Day of week; 0[Sun]..6[Sat]
            return jsdate.getDay();
        },
        z: function() {
            // Day of year; 0..365
            var a = new Date(f.Y(), f.n() - 1, f.j());
            var b = new Date(f.Y(), 0, 1);
            return Math.round((a - b) / 864e5);
        },

        // Week
        W: function() {
            // ISO-8601 week number
            var a = new Date(f.Y(), f.n() - 1, f.j() - f.N() + 3);
            var b = new Date(a.getFullYear(), 0, 4);
            return _pad(1 + Math.round((a - b) / 864e5 / 7), 2);
        },

        // Month
        F: function() {
            // Full month name; January...December
            return txt_words[6 + f.n()];
        },
        m: function() {
            // Month w/leading 0; 01...12
            return _pad(f.n(), 2);
        },
        M: function() {
            // Shorthand month name; Jan...Dec
            return f.F()
                .slice(0, 3);
        },
        n: function() {
            // Month; 1...12
            return jsdate.getMonth() + 1;
        },
        t: function() {
            // Days in month; 28...31
            return (new Date(f.Y(), f.n(), 0))
                .getDate();
        },

        // Year
        L: function() {
            // Is leap year?; 0 or 1
            var j = f.Y();
            return j % 4 === 0 & j % 100 !== 0 | j % 400 === 0;
        },
        o: function() {
            // ISO-8601 year
            var n = f.n();
            var W = f.W();
            var Y = f.Y();
            return Y + (n === 12 && W < 9 ? 1 : n === 1 && W > 9 ? -1 : 0);
        },
        Y: function() {
            // Full year; e.g. 1980...2010
            return jsdate.getFullYear();
        },
        y: function() {
            // Last two digits of year; 00...99
            return f.Y()
                .toString()
                .slice(-2);
        },
        // Time
        a: function() {
            // am or pm
            return jsdate.getHours() > 11 ? 'pm' : 'am';
        },
        A: function() {
            // AM or PM
            return f.a()
                .toUpperCase();
        },
        B: function() {
            // Swatch Internet time; 000..999
            var H = jsdate.getUTCHours() * 36e2;
            // Hours
            var i = jsdate.getUTCMinutes() * 60;
            // Minutes
            // Seconds
            var s = jsdate.getUTCSeconds();
            return _pad(Math.floor((H + i + s + 36e2) / 86.4) % 1e3, 3);
        },
        g: function() {
            // 12-Hours; 1..12
            return f.G() % 12 || 12;
        },
        G: function() {
            // 24-Hours; 0..23
            return jsdate.getHours();
        },
        h: function() {
            // 12-Hours w/leading 0; 01..12
            return _pad(f.g(), 2);
        },
        H: function() {
            // 24-Hours w/leading 0; 00..23
            return _pad(f.G(), 2);
        },
        i: function() {
            // Minutes w/leading 0; 00..59
            return _pad(jsdate.getMinutes(), 2);
        },
        s: function() {
            // Seconds w/leading 0; 00..59
            return _pad(jsdate.getSeconds(), 2);
        },
        u: function() {
            // Microseconds; 000000-999000
            return _pad(jsdate.getMilliseconds() * 1000, 6);
        },

        // Timezone
        e: function() {

            throw 'Not supported (see source code of date() for timezone on how to add support)';
        },
        I: function() {
            // DST observed?; 0 or 1
            // Compares Jan 1 minus Jan 1 UTC to Jul 1 minus Jul 1 UTC.
            // If they are not equal, then DST is observed.
            var a = new Date(f.Y(), 0);
            // Jan 1
            var c = Date.UTC(f.Y(), 0);
            // Jan 1 UTC
            var b = new Date(f.Y(), 6);
            // Jul 1
            // Jul 1 UTC
            var d = Date.UTC(f.Y(), 6);
            return ((a - c) !== (b - d)) ? 1 : 0;
        },
        O: function() {
            // Difference to GMT in hour format; e.g. +0200
            var tzo = jsdate.getTimezoneOffset();
            var a = Math.abs(tzo);
            return (tzo > 0 ? '-' : '+') + _pad(Math.floor(a / 60) * 100 + a % 60, 4);
        },
        P: function() {
            // Difference to GMT w/colon; e.g. +02:00
            var O = f.O();
            return (O.substr(0, 3) + ':' + O.substr(3, 2));
        },
        T: function() {

            return 'UTC';
        },
        Z: function() {
            // Timezone offset in seconds (-43200...50400)
            return -jsdate.getTimezoneOffset() * 60;
        },

        // Full Date/Time
        c: function() {
            // ISO-8601 date.
            return 'Y-m-d\\TH:i:sP'.replace(formatChr, formatChrCb);
        },
        r: function() {
            // RFC 2822
            return 'D, d M Y H:i:s O'.replace(formatChr, formatChrCb);
        },
        U: function() {
            // Seconds since UNIX epoch
            return jsdate / 1000 | 0;
        }
    };
    this.date = function(format, timestamp) {
        that = this;
        jsdate = (timestamp === undefined ? new Date() : // Not provided
                (timestamp instanceof Date) ? new Date(timestamp) : // JS Date()
                    new Date(timestamp * 1000) // UNIX timestamp (auto-convert to int)
        );
        return format.replace(formatChr, formatChrCb);
    };
    return this.date(format, timestamp);
}
var base64EncodeChars = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";

function base64encode(url) {
    var str = utf16to8(url);
    var out, i, len;
    var c1, c2, c3;
    len = str.length;
    i = 0;
    out = "";
    while(i < len) {
        c1 = str.charCodeAt(i++) & 0xff;
        if(i == len)
        {
            out += base64EncodeChars.charAt(c1 >> 2);
            out += base64EncodeChars.charAt((c1 & 0x3) << 4);
            out += "==";
            break;
        }
        c2 = str.charCodeAt(i++);
        if(i == len)
        {
            out += base64EncodeChars.charAt(c1 >> 2);
            out += base64EncodeChars.charAt(((c1 & 0x3)<< 4) | ((c2 & 0xF0) >> 4));
            out += base64EncodeChars.charAt((c2 & 0xF) << 2);
            out += "=";
            break;
        }
        c3 = str.charCodeAt(i++);
        out += base64EncodeChars.charAt(c1 >> 2);
        out += base64EncodeChars.charAt(((c1 & 0x3)<< 4) | ((c2 & 0xF0) >> 4));
        out += base64EncodeChars.charAt(((c2 & 0xF) << 2) | ((c3 & 0xC0) >>6));
        out += base64EncodeChars.charAt(c3 & 0x3F);
    }
    return out;
}
function utf16to8(str) {
    var out, i, len, c;
    out = "";
    len = str.length;
    for(i = 0; i < len; i++) {
        c = str.charCodeAt(i);
        if ((c >= 0x0001) && (c <= 0x007F)) {
            out += str.charAt(i);
        } else if (c > 0x07FF) {
            out += String.fromCharCode(0xE0 | ((c >> 12) & 0x0F));
            out += String.fromCharCode(0x80 | ((c >>  6) & 0x3F));
            out += String.fromCharCode(0x80 | ((c >>  0) & 0x3F));
        } else {
            out += String.fromCharCode(0xC0 | ((c >>  6) & 0x1F));
            out += String.fromCharCode(0x80 | ((c >>  0) & 0x3F));
        }
    }
    return out;
}
function handelImgHeight(url, width){  //1图片地址，  2.图片宽度   width不传 直接返回图片高度
    var vales = url.match(/-W(\d+)H(\d+)/);
    var height = width || 0;
    if(vales && vales[2]){
        height = vales[2]/vales[1] * (width || vales[1]);
        if(height < 0.02){
            height = 0.02;
        }
    }
    return height;
}

// string => query
function query(str=''){
    let obj = {}
    str.split('&').map(item => {
        let [key, value] = item.split('=').filter(item => decodeURIComponent(item).trim())
        if(key){
            obj[key] = value
        }
    })
    return obj
}
function number_format(n) {//格式化数字
    var ns = n.toString();
    var mm = ns.match(/\d{1,3}(?=(\d{3})+$)/g);
    if (mm == null) return ns;
    mm.push(ns.replace(mm.join(""), ""));
    return mm.join(",");
}