/*======================================== 时间格式化 ========================================*/
Date.prototype.Format = function(fmt) {
    var o = {
        "M+": this.getMonth() + 1, //月份 
        "d+": this.getDate(), //日 
        "h+": this.getHours(), //小时 
        "m+": this.getMinutes(), //分 
        "s+": this.getSeconds(), //秒 
        "q+": Math.floor((this.getMonth() + 3) / 3), //季度 
        "S": this.getMilliseconds() //毫秒 
    };
    if (/(y+)/.test(fmt)) fmt = fmt.replace(RegExp.$1, (this.getFullYear() + "").substr(4 - RegExp.$1.length));
    for (var k in o)
        if (new RegExp("(" + k + ")").test(fmt)) fmt = fmt.replace(RegExp.$1, (RegExp.$1.length == 1) ? (o[k]) : (("00" + o[k]).substr(("" + o[k]).length)));
    return fmt;
}
//使用方法：(时间转成yyyy-MM-dd hh:mm:ss)
//var time1 = new Date().Format("yyyy-MM-dd");
//var time2 = new Date().Format("yyyy-MM-dd hh:mm:ss");

/*======================================== 获得两个日期之间相差的天数，date1，date2为日期对象 ========================================*/
window.getDays = function(date1, date2) {
    const dateTime = 1000 * 60 * 60 * 24; //每一天的毫秒数
    const minusDays = Math.floor(((date2.getTime() - date1.getTime()) / dateTime)); //计算出两个日期的天数差
    return Math.abs(minusDays);
}

/*======================================== 获取浏览器url中的参数值 ========================================*/
window.getURLParam = function(name) {
    return decodeURIComponent((new RegExp('[?|&]' + name + '=' + '([^&;]+?)(&|#|;|$)', "ig").exec(location.search) || [, ""])[1].replace(/\+/g, '%20')) || null;
}

/*======================================== 获取URL的查询参数 ========================================*/
window.getParam = function() {
    q={};location.search.replace(/([^?&=]+)=([^&]+)/g,(_,k,v)=>q[k]=v);
    return q;
}

/*======================================== 用字符串返回一个键盘图形 ========================================*/
window.returnKeyboard = function() {
    return (_=>[..."`1234567890-=~~QWERTYUIOP[]\\~ASDFGHJKL;'~~ZXCVBNM,./~"].map(x=>(o+=`/${b='_'.repeat(w=x<y?2:' 667699'[x=["BS","TAB","CAPS","ENTER"][p++]||'SHIFT',p])}\\|`,m+=y+(x+'    ').slice(0,w)+y+y,n+=y+b+y+y,l+=' __'+b)[73]&&(k.push(l,m,n,o),l='',m=n=o=y),m=n=o=y='|',p=l=k=[])&&k.join`
`)()
}

/*======================================== 去除字符串两边的空格 ========================================*/
String.prototype.trim = function() {
    return this.replace(/(^\s*)|(\s*$)/g, "");
}

/*======================================== 去除字符串左边的空格 ========================================*/
String.prototype.ltrim = function() {
    return this.replace(/(^\s*)/g, "");
}

/*======================================== 去除字符串右边的空格 ========================================*/
String.prototype.rtrim = function() {
    return this.replace(/(\s*$)/g, "");
}

/*======================================== 设置cookie ========================================*/
window.setCookie = function(name, value) {
    var Days = 30;
    var exp = new Date();
    exp.setTime(exp.getTime() + Days * 24 * 60 * 60 * 1000);
    document.cookie = name + "=" + escape(value) + ";expires=" + exp.toGMTString();
}

/*======================================== 获取cookie ========================================*/
window.getCookie = function(name) {
    var arr = document.cookie.match(new RegExp("(^| )" + name + "=([^;]*)(;|$)"));
    if (arr != null) {
        return (arr[2]);
    } else {
        return "";
    }
}

/*======================================== 删除cookie ========================================*/
window.delCookie = function(name) {
    var exp = new Date();
    exp.setTime(exp.getTime() - 1);
    var cval = getCookie(name);
    if (cval != null) {
        document.cookie = name + "=" + cval + ";expires=" + exp.toGMTString();
    }
}

/*======================================== Base64加密 ========================================*/
window.Base64 = function() {
    // private property
    _keyStr = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=";

    // public method for encoding
    this.encode = function(input) {
        var output = "";
        var chr1, chr2, chr3, enc1, enc2, enc3, enc4;
        var i = 0;
        input = this._utf8_encode(input);
        while (i < input.length) {
            chr1 = input.charCodeAt(i++);
            chr2 = input.charCodeAt(i++);
            chr3 = input.charCodeAt(i++);
            enc1 = chr1 >> 2;
            enc2 = ((chr1 & 3) << 4) | (chr2 >> 4);
            enc3 = ((chr2 & 15) << 2) | (chr3 >> 6);
            enc4 = chr3 & 63;
            if (isNaN(chr2)) {
                enc3 = enc4 = 64;
            } else if (isNaN(chr3)) {
                enc4 = 64;
            }
            output = output +
                _keyStr.charAt(enc1) + _keyStr.charAt(enc2) +
                _keyStr.charAt(enc3) + _keyStr.charAt(enc4);
        }
        return output;
    }

    // public method for decoding
    this.decode = function(input) {
        var output = "";
        var chr1, chr2, chr3;
        var enc1, enc2, enc3, enc4;
        var i = 0;
        input = input.replace(/[^A-Za-z0-9\+\/\=]/g, "");
        while (i < input.length) {
            enc1 = _keyStr.indexOf(input.charAt(i++));
            enc2 = _keyStr.indexOf(input.charAt(i++));
            enc3 = _keyStr.indexOf(input.charAt(i++));
            enc4 = _keyStr.indexOf(input.charAt(i++));
            chr1 = (enc1 << 2) | (enc2 >> 4);
            chr2 = ((enc2 & 15) << 4) | (enc3 >> 2);
            chr3 = ((enc3 & 3) << 6) | enc4;
            output = output + String.fromCharCode(chr1);
            if (enc3 != 64) {
                output = output + String.fromCharCode(chr2);
            }
            if (enc4 != 64) {
                output = output + String.fromCharCode(chr3);
            }
        }
        output = this._utf8_decode(output);
        return output;
    }

    // private method for UTF-8 encoding
    this._utf8_encode = function(string) {
        string = string.replace(/\r\n/g, "\n");
        var utftext = "";
        for (var n = 0; n < string.length; n++) {
            var c = string.charCodeAt(n);
            if (c < 128) {
                utftext += String.fromCharCode(c);
            } else if ((c > 127) && (c < 2048)) {
                utftext += String.fromCharCode((c >> 6) | 192);
                utftext += String.fromCharCode((c & 63) | 128);
            } else {
                utftext += String.fromCharCode((c >> 12) | 224);
                utftext += String.fromCharCode(((c >> 6) & 63) | 128);
                utftext += String.fromCharCode((c & 63) | 128);
            }

        }
        return utftext;
    }

    // private method for UTF-8 decoding
    this._utf8_decode = function(utftext) {
        var string = "";
        var i = 0;
        var c = c1 = c2 = 0;
        while (i < utftext.length) {
            c = utftext.charCodeAt(i);
            if (c < 128) {
                string += String.fromCharCode(c);
                i++;
            } else if ((c > 191) && (c < 224)) {
                c2 = utftext.charCodeAt(i + 1);
                string += String.fromCharCode(((c & 31) << 6) | (c2 & 63));
                i += 2;
            } else {
                c2 = utftext.charCodeAt(i + 1);
                c3 = utftext.charCodeAt(i + 2);
                string += String.fromCharCode(((c & 15) << 12) | ((c2 & 63) << 6) | (c3 & 63));
                i += 3;
            }
        }
        return string;
    }
}

/*======================================== Base64加解密 ========================================*/
window.Base64Encoding = function(str, pwd, type) {
    var b = new Base64(); //Base64加密
    if (type == 'encryption') { //Base64加密
        str = b.encode(str); 
        var prand = "";
        for (var i = 0; i < pwd.length; i++) {
            prand += pwd.charCodeAt(i).toString();
        }
        var sPos = Math.floor(prand.length / 5);
        var mult = parseInt(prand.charAt(sPos) + prand.charAt(sPos * 2) + prand.charAt(sPos * 3) + prand.charAt(sPos * 4) + prand.charAt(sPos * 5));
        var incr = Math.ceil(pwd.length / 2);
        var modu = Math.pow(2, 31) - 1;
        if (mult < 2) {
            alert("Please choose a more complex or longer password.");
            return null;
        }
        var salt = Math.round(Math.random() * 1000000000) % 100000000;
        prand += salt;
        while (prand.length > 10) {
            prand = (parseInt(prand.substring(0, 10)) + parseInt(prand.substring(10, prand.length))).toString();
        }
        prand = (mult * prand + incr) % modu;
        var enc_chr = "";
        var enc_str = "";
        for (var i = 0; i < str.length; i++) {
            enc_chr = parseInt(str.charCodeAt(i) ^ Math.floor((prand / modu) * 255));
            if (enc_chr < 16) {
                enc_str += "0" + enc_chr.toString(16);
            } else enc_str += enc_chr.toString(16);
            prand = (mult * prand + incr) % modu;
        }
        salt = salt.toString(16);
        while (salt.length < 8) salt = "0" + salt;
        enc_str += salt;
        return enc_str;
    }
    if (type == 'decryption') { //Base64解密
        var prand = "";
        for (var i = 0; i < pwd.length; i++) {
            prand += pwd.charCodeAt(i).toString();
        }
        var sPos = Math.floor(prand.length / 5);
        var mult = parseInt(prand.charAt(sPos) + prand.charAt(sPos * 2) + prand.charAt(sPos * 3) + prand.charAt(sPos * 4) + prand.charAt(sPos * 5));
        var incr = Math.round(pwd.length / 2);
        var modu = Math.pow(2, 31) - 1;
        var salt = parseInt(str.substring(str.length - 8, str.length), 16);
        str = str.substring(0, str.length - 8);
        prand += salt;
        while (prand.length > 10) {
            prand = (parseInt(prand.substring(0, 10)) + parseInt(prand.substring(10, prand.length))).toString();
        }
        prand = (mult * prand + incr) % modu;
        var enc_chr = "";
        var enc_str = "";
        for (var i = 0; i < str.length; i += 2) {
            enc_chr = parseInt(parseInt(str.substring(i, i + 2), 16) ^ Math.floor((prand / modu) * 255));
            enc_str += String.fromCharCode(enc_chr);
            prand = (mult * prand + incr) % modu;
        }
        //return enc_str;
        return b.decode(enc_str);
    }
}
/*======================================== 禁止右键/选择/复制 ========================================*/
window.stopEvent = function(){
    ['contextmenu', 'selectstart', 'copy'].forEach(function(ev){
        document.addEventListener(ev, function(event){
            return event.returnValue = false
        })
    });
}
/*======================================== 判断两个小数是否相等 ========================================*/
//console.log(0.1 + 0.2  === 0.3); // false
function equal(number1, number2) {
    return Math.abs(number1 - number2) < Math.pow(2, -52);
}