http://www.atool.org/hexconvert.php

ss = "0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ_@";
function v10toX(n, m) {
    m = String(m).replace(/ /gi, "");
    if (m == "") {
        return ""
    }
    var a = ss.substr(0, 10);
    var b = a + ".";
    if (eval("m.replace(/[" + b + "]/gi,'')") != "") {
        M("請輸入有效的進制數！");
        return ""
    }
    m = m.split(".");
    if (m.length > 2) {
        M("請輸入有效的進制數！");
        return ""
    }
    var a = ss.substr(0, n);
    if (m.length == 1) {
        m = m[0];
        var t = "";
        while (m != 0) {
            var b = m % n;
            t = a.charAt(b) + t;
            m = (m - b) / n
        }
        return t
    } else {
        var m0 = m[0];
        var t = "";
        while (m0 != 0) {
            var b = m0 % n;
            t = a.charAt(b) + t;
            m0 = (m0 - b) / n
        }
        var cnt = 18;
        var m1 = m[1];
        m1 = parseFloat("0." + m1);
        var d = "", b = 0;
        while (m1 != 0 && cnt > 0) {
            m1 = m1 * n;
            b = parseInt(m1);
            d = d + a.charAt(b);
            m1 = m1 - b;
            cnt--
        }
        return t + "." + d
    }
}
function vXto10(n, m) {
    m = String(m).replace(/ /gi, "");
    if (m == "") {
        return ""
    }
    var a = ss.substr(0, n);
    var b = a + ".";
    if (eval("m.replace(/[" + b + "]/gi,'')") != "") {
        M("請輸入有效的" + n + "進制數！");
        return ""
    }
    m = m.split(".");
    if (m.length > 2) {
        M("請輸入有效的" + n + "進制數！");
        return ""
    }
    if (m.length == 1) {
        m = m[0];
        var t = 0, c = 1;
        for (var x = m.length - 1; x > -1; x--) {
            t += c * (a.indexOf(m.charAt(x)));
            c *= n
        }
        return t
    } else {
        var m0 = m[0];
        var t = 0, c = 1;
        for (var x = m0.length - 1; x > -1; x--) {
            t += c * (a.indexOf(m0.charAt(x)));
            c *= n
        }
        var m1 = m[1];
        var d = 0, c = 1 / n;
        for (var x = 0; x < m1.length; x++) {
            d += c * (a.indexOf(m1.charAt(x)));
            c /= n
        }
        return t + d
    }
}
function vXtoY(d, b, c) {
    a = vXto10(d * 1, b);
    if (a == "") {
        return ""
    }
    a = v10toX(c, a);
    return a
}
function M(b) {
    alert(b)
}
function convert(g, h, i, f) {
    var e = document.getElementById(h).value;
    var d = document.getElementById(f);
    var b = document.getElementById(g).value;
    var c = document.getElementById(i).value;
    d.value = vXtoY(b, e, c)
}
function convert_c(g, e, f, d) {
    var c = document.getElementById(e).value;
    var b = document.getElementById(d);
    b.value = vXtoY(g, c, f)
};

<div class="row">
    <span class="span strong">二　進　制：</span>
    <div class="span four xs-four">
        <input type="text" id="bin_1" alt="二進制數" title="二進制數" class="input-text" value="10011110101110110100010">
    </div>
    <span class="span strong">十　進　制：</span>
    <div class="span four xs-four">
        <input type="text" id="ten_1" alt="十進制數" title="十進制數" class="input-text" value="">
    </div>
    <button class="button primary small" type="button" onclick="convert_c(2, 'bin_1', 10, 'ten_1');">轉換</button>
</div>
<div class="row">
    <span class="span strong">十　進　制：</span>
    <div class="span four xs-four">
        <input type="text" id="ten_2" alt="十進制數" title="十進制數" class="input-text" value="520.1314">
    </div>
    <span class="span strong">二　進　制：</span>
    <div class="span four xs-four">
        <input type="text" id="bin_2" alt="二進制數" title="二進制數" class="input-text" value="">
    </div>
    <button class="button primary small" type="button" onclick="convert_c(10, 'ten_2', 2, 'bin_2');">轉換</button>
</div>
<div class="divider form-hr"></div>
<div class="row">
    <span class="span strong">十　進　制：</span>
    <div class="span four xs-four">
        <input type="text" id="ten_3" alt="十進制數" title="十進制數" class="input-text" value="520.1314">
    </div>
    <span class="span strong">十六進制　：</span>
    <div class="span four xs-four">
        <input type="text" id="ten_six_3" alt="十六進制數" title="十六進制數" class="input-text" value="">
    </div>
    <button class="button primary small" type="button" onclick="convert_c(10, 'ten_3', 16, 'ten_six_3');">轉換</button>
</div>
<div class="row">
    <span class="span strong">十六進制　：</span>
    <div class="span four xs-four">
        <input type="text" id="ten_six_4" alt="十六進制數" title="十六進制數" class="input-text" value="4f5da2">
    </div>
    <span class="span strong">十　進　制：</span>
    <div class="span four xs-four">
        <input type="text" id="ten_4" alt="十進制數" title="十進制數" class="input-text" value="">
    </div>
    <button class="button primary small" type="button" onclick="convert_c(16, 'ten_six_4', 10, 'ten_4');">轉換</button>
</div>
<div class="divider form-hr"></div>
<div class="row">
    <span class="span strong">十　進　制：</span>
    <div class="span four xs-four">
        <input type="text" id="ten_5" alt="十進制數" title="十進制數" class="input-text" value="520.1314">
    </div>
    <span class="span strong">六十四進制：</span>
    <div class="span four xs-four">
        <input type="text" id="six_four_5" alt="六十四進制數" title="六十四進制數" class="input-text" value="">
    </div>
    <button class="button primary small" type="button" onclick="convert_c(10, 'ten_5', 64, 'six_four_5');">轉換</button>
</div>
<div class="row">
    <span class="span strong">六十四進制：</span>
    <div class="span four xs-four">
        <input type="text" id="six_four_6" alt="六十四進制數" title="六十四進制數" class="input-text" value="jRSy">
    </div>
    <span class="span strong">十　進　制：</span>
    <div class="span four xs-four">
        <input type="text" id="ten_6" alt="十進制數" title="十進制數" class="input-text" value="">
    </div>
    <button class="button primary small" type="button" onclick="convert_c(64, 'six_four_6', 10, 'ten_6');">轉換</button>
</div>

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