SOURCE

  var code = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/".split(""); //索引表

    /** 
     * @description 将二进制序列转换为Base64编码
     * @param {String}
     * @return {String}
     */
    function binToBase64(bitString) {
        var result = "";
        var tail = bitString.length % 6;
        var bitStringTemp1 = bitString.substr(0, bitString.length - tail);
        var bitStringTemp2 = bitString.substr(bitString.length - tail, tail);
        for (var i = 0; i < bitStringTemp1.length; i += 6) {
            var index = parseInt(bitStringTemp1.substr(i, 6), 2);
            result += code[index];
        }
        bitStringTemp2 += new Array(7 - tail).join("0");
        if (tail) {
            result += code[parseInt(bitStringTemp2, 2)];
            result += new Array((6 - tail) / 2 + 1).join("=");
        }
        return result;
    }
    function base64ToBin(str) {
        var bitString = "";
        var tail = 0;
        for (var i = 0; i < str.length; i++) {
            if (str[i] != "=") {
                var decode = code.indexOf(str[i]).toString(2);
                bitString += (new Array(7 - decode.length)).join("0") + decode;
            } else {
                tail++;
            }
        }
        return bitString.substr(0, bitString.length - tail * 2);
    }
     function BinToStr(Bin) {
        var result = "";
        for (var i = 0; i < Bin.length; i += 8) {
            result += String.fromCharCode(parseInt(Bin.substr(i, 8), 2));
        }
        return result;
    }
    function stringToBin(str) {
        var result = "";
        for (var i = 0; i < str.length; i++) {
            var charCode = str.charCodeAt(i).toString(2);
            result += (new Array(9 - charCode.length).join("0") + charCode);
        }
        return result;
    }
   console.log(BinToStr("011010000110101001100001011010100110101101101100011001100110010001100001011001110011000100110001001100100011100000111001001011100100000101000100010100110100011001000100010010000011111100100011010111100011001000100001011000010111001101100001011100110110010000111011011011000011000100110001001100100011001000110011")) 
    console.log(stringToBin("hjajklfdag11289.ADSFDH?#^2!asasd;l11223"))
 console.log(binToBase64("011010000110101001100001011010100110101101101100011001100110010001100001011001110011000100110001001100100011100000111001001011100100000101000100010100110100011001000100010010000011111100100011010111100011001000100001011000010111001101100001011100110110010000111011011011000011000100110001001100100011001000110011"))
 
console.log(base64ToBin("aGphamtsZmRhZzExMjg5LkFEU0ZESD8jXjIhYXNhc2Q7bDExMjIz"))

function isChinese(s) {
        var patrn = /[\u4E00-\u9FA5]|[\uFE30-\uFFA0]/gi;
        if (!patrn.exec(s)) {
            return false;
        } else {
            return true;
        }
    }
console.log(isChinese("到付哈1293jsks"))
console.log(isChinese("112ssd"))
/**  单位换算，格式化显示长度     */
    function formatLength(val, unit) {
        if (val == null) return ""; 
        val = Number(val);

        if (unit == null || unit == "auto") {
            if (val < 1000)
                unit = "m";
            else
                unit = "km";
        }

        var valstr = "";
        switch (unit) {
            default:
            case "m":
                valstr = val.toFixed(2) + '米';
                break;
            case "km":
                valstr = (val * 0.001).toFixed(2) + '公里';
                break;
            case "mile":
                valstr = (val * 0.00054).toFixed(2) + '海里';
                break;
            case "zhang":
                valstr = (val * 0.3).toFixed(2) + '丈';
                break;
        }
        return valstr;
    }
console.log(formatLength(23233))
console.log(formatLength(233))

    console.log(formatLength(23233, "m"))
    console.log(formatLength(23, "m"))
    console.log(formatLength(23, "km"))
    console.log(formatLength(23233, "mile"))
    console.log(formatLength(23233, "zhang"))
     //格式化时间
    function formatTime(strtime) {
        strtime = Number(strtime)||0;

        if (strtime < 60)
            return strtime.toFixed(0) + "秒";
        else if (strtime >= 60 && strtime < 3600) {
            var miao = Math.floor(strtime % 60);
            return Math.floor(strtime / 60) + "分钟" + (miao != 0 ? (miao + "秒") : "");
        }
        else {
            strtime = Math.floor(strtime / 60); //秒转分钟
            return Math.floor(strtime / 60) + "小时" + Math.floor(strtime % 60) + "分钟";
        }
    }
    console.log(formatTime(120))
    console.log(formatTime(1100023))

  function getWindowSize() {
        if (typeof window.innerWidth != 'undefined') {
            return {
                width: window.innerWidth,
                height: window.innerHeight
            }
        } else {
            return {
                width: document.documentElement.clientWidth,
                height: document.documentElement.clientHeight
            }
        }
    }
 console.log(getWindowSize())
function getExplorerInfo() {
        var explorer = window.navigator.userAgent.toLowerCase();
        //ie 
        if (explorer.indexOf("msie") >= 0) {
            var ver = Number(explorer.match(/msie ([\d]+)/)[1]);
            return { type: "IE", version: ver };
        }
        //firefox 
        else if (explorer.indexOf("firefox") >= 0) {
            var ver = Number(explorer.match(/firefox\/([\d]+)/)[1]);
            return { type: "Firefox", version: ver };
        }
        //Chrome
        else if (explorer.indexOf("chrome") >= 0) {
            var ver = Number(explorer.match(/chrome\/([\d]+)/)[1]);
            return { type: "Chrome", version: ver };
        }
        //Opera
        else if (explorer.indexOf("opera") >= 0) {
            var ver = Number(explorer.match(/opera.([\d]+)/)[1]);
            return { type: "Opera", version: ver };
        }
        //Safari
        else if (explorer.indexOf("Safari") >= 0) {
            var ver = Number(explorer.match(/version\/([\d]+)/)[1]);
            return { type: "Safari", version: ver };
        }
        return { type: explorer, version: -1 };
    }
console.log(getExplorerInfo())
   //浏览器
    function isPCBroswer() {
        var sUserAgent = navigator.userAgent.toLowerCase();

        var bIsIpad = sUserAgent.match(/ipad/i) == "ipad";
        var bIsIphoneOs = sUserAgent.match(/iphone/i) == "iphone";
        var bIsMidp = sUserAgent.match(/midp/i) == "midp";
        var bIsUc7 = sUserAgent.match(/rv:1.2.3.4/i) == "rv:1.2.3.4";
        var bIsUc = sUserAgent.match(/ucweb/i) == "ucweb";
        var bIsAndroid = sUserAgent.match(/android/i) == "android";
        var bIsCE = sUserAgent.match(/windows ce/i) == "windows ce";
        var bIsWM = sUserAgent.match(/windows mobile/i) == "windows mobile";
        if (bIsIpad || bIsIphoneOs || bIsMidp || bIsUc7 || bIsUc || bIsAndroid || bIsCE || bIsWM) {
            return false;
        } else {
            return true;
        }
    }
console.log(isPCBroswer())