十六进制转浮点数

KK KK KK KK卡路里

低位在前，高位在后。浮点数遵循 IEEE R32.24，单位为千卡。00003041

转换方法如下：

HexToSingle(t) {
        if (t === "") {
            return "";
        }
        if (t == "00000000") {
            return "0";
        }
        if ((t.length > 8) || (isNaN(parseInt(t, 16)))) {
            return "Error";
        }
        if (t.length < 8) {
            t = this.FillString(t, "0", 8, true);
        }
        t = parseInt(t, 16).toString(2);
        t = this.FillString(t, "0", 32, true);
        var s = t.substring(0, 1);
        var e = t.substring(1, 9);
        var m = t.substring(9);
        e = parseInt(e, 2) - 127;
        m = "1" + m;
        if (e >= 0) {
            m = m.substr(0, e + 1) + "." + m.substring(e + 1);
        }
         else {
            m = "0." + this.FillString(m, "0", m.length - e - 1, true);
        }
        if (m.indexOf(".") == -1) {
            m = m + ".0";
        }
        var a = m.split(".");
        var mi = parseInt(a[0], 2);
        var mf = 0;
        for (var i = 0; i < a[1].length; i++) {
            mf += parseFloat(a[1].charAt(i)) * Math.pow(2, -(i + 1));
        }
        m = parseInt(mi) + parseFloat(mf);
        if (s == 1) {
            m = 0 - m;
        }
        return m;
    },
    FillString(t, c, n, b) {
        if ((t === "") || (c.length != 1) || (n <= t.length)) {
            return t;
        }
        var l = t.length;
        for (var i = 0; i < n - l; i++) {
            if (b === true) {
                t = c + t;
            } else {
                t += c;
            }
        }
        return t;
    }