chenchuanbao
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							<!DOCTYPE html>
<html lang='en'>
<head>
  <meta charset='utf-8' />
  <meta name="Author" content="M Mclaughlin">
  <title>Testing BigNumber</title>
  <style>
    body {margin: 0; padding: 0; font-family: Calibri, Arial, Sans-Serif;}
    div {margin: 1em 0;}
    h1, #counter {text-align: center; background-color: rgb(225, 225, 225);
        margin-top: 1em; padding: 0.2em; font-size: 1.2em;}
    a {color:  rgb(0, 153, 255); margin: 0 0.6em;}
    .links {position: fixed; bottom: 1em; right: 2em; font-size: 0.8em;}
    .form, #time {width: 36em; margin: 0 auto;}
    .form {text-align: left; margin-top: 1.4em;}
    .random input {margin-left: 1em;}
    .small {font-size: 0.9em;}
    .methods {margin: 1em auto; width: 28em;}
    .iterations input, .left {margin-left: 1.6em;}
    .info span {margin-left: 1.6em; font-size: 0.9em;}
    .info {margin-top: 1.6em;}
    .random input, .iterations input {margin-right: 0.3em;}
    .random label, .iterations label, .bigd label {font-size: 0.9em;
        margin-left: 0.1em;}
    .methods label {width: 5em; margin-left: 0.2em; display: inline-block;}
    .methods label.right {width: 2em;}
    .red {color: red; font-size: 1.1em; font-weight: bold;}
    button {width: 10em; height: 2em;}
    #dp, #r, #digits, #reps {margin-left: 0.8em;}
    #bigint {font-style: italic; display: none;}
    #gwt, #icu4j, #bd, #bigint {margin-left: 1.5em;}
    #division {display: none;}
    #counter {font-size: 2em; background-color: rgb(235, 235, 235);}
    #time {text-align: center;}
    #results {margin: 0 1.4em;}
  </style>
  <script src='../bignumber.js'></script>
  <script src='./lib/bigdecimal_GWT/bigdecimal.js'></script>
</head>
<body>
  <h1>Testing BigNumber against BigDecimal</h1>

  <div class='form'>

    <div class='methods'>
      <input type='radio' id=0 name=1/><label for=0>plus</label>
      <input type='radio' id=3 name=1/><label for=3>dividedBy</label>
      <input type='radio' id=6 name=1/><label for=6 class='right'>absoluteValue</label>
      <br>
      <input type='radio' id=1 name=1/><label for=1>minus</label>
      <input type='radio' id=4 name=1/><label for=4>modulo</label>
      <input type='radio' id=7 name=1/><label for=7 class='right'>negated</label>
      <br>
      <input type='radio' id=2 name=1/><label for=2>multipliedBy</label>
      <input type='radio' id=5 name=1/><label for=5>comparedTo</label>
      <input type='radio' id=8 name=1/><label for=8 class='right'>exponentiatedBy</label>
    </div>

    <div class='bigd'>
      <span>BigDecimal:</span>
      <input type='radio' name=2 id='gwt' /><label for='gwt'>GWT</label>
      <input type='radio' name=2 id='icu4j' /><label for='icu4j'>ICU4J</label>
      <span id='bigint'>BigInteger</span>
      <span id='bd'>add</span>
    </div>

    <div class='random'>
      Random number digits:<input type='text' id='digits' size=12 />
      <input type='radio' name=3 id='fix' /><label for='fix'>Fixed</label>
      <input type='radio' name=3 id='max' /><label for='max'>Max</label>
      <input type='checkbox' id='int' /><label for='int'>Integers only</label>
    </div>

    <div id='division'>
      <span>Decimal places:<input type='text' id='dp' size=9 /></span>
      <span class='left'>Rounding:<select id='r'>
          <option>UP</option>
          <option>DOWN</option>
          <option>CEIL</option>
          <option>FLOOR</option>
          <option>HALF_UP</option>
          <option>HALF_DOWN</option>
          <option>HALF_EVEN</option>
        </select></span>
    </div>

    <div class='iterations'>
      Iterations:<input type='text' id='reps' size=11 />
      <input type='checkbox' id='show'/><label for='show'>Show all (no timing)</label>
    </div>

    <div class='info'>
      <button id='start'>Start</button>
      <span>Click a method to stop</span>
      <span>Press space bar to pause/unpause</span>
    </div>

  </div>

  <div id='counter'>0</div>
  <div id='time'></div>
  <div id='results'></div>

  <div class='links'>
    <a href='https://github.com/MikeMcl/bignumber.js' target='_blank'>BigNumber</a>
    <a href='https://github.com/iriscouch/bigdecimal.js' target='_blank'>GWT</a>
    <a href='https://github.com/dtrebbien/BigDecimal.js/tree/' target='_blank'>ICU4J</a>
  </div>

  <script>

var i, completedReps, targetReps, cycleReps, cycleTime, prevCycleReps, cycleLimit,
    maxDigits, isFixed, isIntOnly, decimalPlaces, rounding, calcTimeout,
    counterTimeout, script, isGWT, BigDecimal_GWT, BigDecimal_ICU4J,
    bdM, bdTotal, bnM, bnTotal,
    bdMs = ['add', 'subtract', 'multiply', 'divide', 'remainder', 'compareTo',
        'abs', 'negate', 'pow'],
    bnMs = ['plus', 'minus', 'multipliedBy', 'dividedBy', 'modulo', 'comparedTo', 'absoluteValue',
        'negated', 'exponentiatedBy'],
    lastRounding = 4,
    pause = false,
    up = true,
    timingVisible = false,
    showAll = false,

    // Edit defaults here

    DEFAULT_REPS = 10000,
    DEFAULT_DIGITS = 20,
    DEFAULT_DECIMAL_PLACES = 20,
    DEFAULT_ROUNDING = 4,
    MAX_POWER = 20,
    CHANCE_NEGATIVE = 0.5,   // 0 (never) to 1 (always)
    CHANCE_INTEGER = 0.2,    // 0 (never) to 1 (always)
    MAX_RANDOM_EXPONENT = 100,
    SPACE_BAR = 32,
    ICU4J_URL = './lib/bigdecimal_ICU4J/BigDecimal-all-last.js',

    //

    $ = function (id) {return document.getElementById(id)},
    $INPUTS = document.getElementsByTagName('input'),
    $BD = $('bd'),
    $BIGINT = $('bigint'),
    $DIGITS = $('digits'),
    $GWT = $('gwt'),
    $ICU4J = $('icu4j'),
    $FIX = $('fix'),
    $MAX = $('max'),
    $INT = $('int'),
    $DIV = $('division'),
    $DP = $('dp'),
    $R = $('r'),
    $REPS = $('reps'),
    $SHOW = $('show'),
    $START = $('start'),
    $COUNTER = $('counter'),
    $TIME = $('time'),
    $RESULTS = $('results'),

    // Get random number in normal notation.
    getRandom = function () {
        var z,
            i = 0,
            // n is the number of digits - 1
            n = isFixed ? maxDigits - 1 : Math.random() * (maxDigits || 1) | 0,
            r = ( Math.random() * 10 | 0 ) + '';

        if (n) {
            if (r == '0')
                r = isIntOnly ? ( ( Math.random() * 9 | 0 ) + 1 ) + '' : (z = r + '.');

            for ( ; i++ < n; r += Math.random() * 10 | 0 ){}

            if (!z && !isIntOnly && Math.random() > CHANCE_INTEGER) {
                r = r.slice( 0, i = (Math.random() * n | 0) + 1 ) +
                    '.' + r.slice(i);
            }
        }

        // Avoid division by zero error with division and modulo
        if ((bdM == 'divide' || bdM == 'remainder') && parseFloat(r) === 0)
            r = ( ( Math.random() * 9 | 0 ) + 1 ) + '';

        return Math.random() > CHANCE_NEGATIVE ? r : '-' + r;
    },

    // Get random number in exponential notation (if isIntOnly is false).
    // GWT BigDecimal BigInteger does not accept exponential notation.
    //getRandom = function () {
    //    var i = 0,
    //        // n is the number of significant digits - 1
    //        n = isFixed ? maxDigits - 1 : Math.random() * (maxDigits || 1) | 0,
    //        r = ( ( Math.random() * 9 | 0 ) + 1 ) + '';
    //
    //    for (; i++ < n; r += Math.random() * 10 | 0 ){}
    //
    //    if ( !isIntOnly ) {
    //
    //        // Add exponent.
    //        r += 'e' + ( Math.random() > 0.5 ? '+' : '-' ) +
    //          ( Math.random() * MAX_RANDOM_EXPONENT | 0 );
    //    }
    //
    //    return Math.random() > CHANCE_NEGATIVE ? r : '-' + r
    //},

    showTimings = function () {
        var i, bdS, bnS,
            sp = '',
            r = bnTotal < bdTotal
              ? (bnTotal ? bdTotal / bnTotal : bdTotal)
              : (bdTotal ? bnTotal / bdTotal : bnTotal);

        bdS = 'BigDecimal: ' + (bdTotal || '<1');
        bnS = 'BigNumber: ' + (bnTotal || '<1');

        for ( i = bdS.length - bnS.length; i-- > 0; sp += '&nbsp;'){}
        bnS = 'BigNumber: ' + sp + (bnTotal || '<1');

        $TIME.innerHTML =
            'No mismatches<div>' + bdS + ' ms<br>' + bnS + ' ms</div>' +
                ((r = parseFloat(r.toFixed(1))) > 1
                    ? 'Big' + (bnTotal < bdTotal ? 'Number' : 'Decimal')
                        + ' was ' + r + ' times faster'
                    : 'Times approximately equal');
    },

    clear = function () {
        clearTimeout(calcTimeout);
        clearTimeout(counterTimeout);

        $COUNTER.style.textDecoration = 'none';
        $COUNTER.innerHTML = '0';
        $TIME.innerHTML = $RESULTS.innerHTML = '';
        $START.innerHTML = 'Start';
    },

    begin = function () {
        var i;
        clear();

        targetReps = +$REPS.value;
        if (!(targetReps > 0)) return;

        $START.innerHTML = 'Restart';

        i = +$DIGITS.value;
        $DIGITS.value = maxDigits = i && isFinite(i) ? i : DEFAULT_DIGITS;

        for (i = 0; i < 9; i++) {
            if ($INPUTS[i].checked) {
                bnM = bnMs[$INPUTS[i].id];
                bdM = bdMs[$INPUTS[i].id];
                break;
            }
        }

        if (bdM == 'divide') {
            i = +$DP.value;
            $DP.value = decimalPlaces = isFinite(i) ? i : DEFAULT_DECIMAL_PLACES;
            rounding = +$R.selectedIndex;
            BigNumber.config({ DECIMAL_PLACES: decimalPlaces, ROUNDING_MODE: rounding });
        }

        isFixed = $FIX.checked;
        isIntOnly = $INT.checked;
        showAll = $SHOW.checked;

        BigDecimal = (isGWT = $GWT.checked)
            ? (isIntOnly ? BigInteger : BigDecimal_GWT)
            : BigDecimal_ICU4J;

        prevCycleReps = cycleLimit = completedReps = bdTotal = bnTotal = 0;
        pause = false;

        cycleReps = showAll ? 1 : 0.5;
        cycleTime = +new Date();

        setTimeout(updateCounter, 0);
    },

    updateCounter = function () {

        if (pause) {
            if (!timingVisible && !showAll) {
                showTimings();
                timingVisible = true;
            }
            counterTimeout = setTimeout(updateCounter, 50);
            return;
        }

        $COUNTER.innerHTML = completedReps;

        if (completedReps < targetReps) {
            if (timingVisible) {
                $TIME.innerHTML = '';
                timingVisible = false;
            }

            if (!showAll) {

                // Adjust cycleReps so counter is updated every second-ish
                if (prevCycleReps != cycleReps) {

                    // cycleReps too low
                    if (+new Date() - cycleTime < 1e3) {
                        prevCycleReps = cycleReps;

                        if (cycleLimit) {
                            cycleReps += ((cycleLimit - cycleReps) / 2);
                        } else {
                            cycleReps *= 2;
                        }

                    // cycleReps too high
                    } else {
                        cycleLimit = cycleReps;
                        cycleReps -= ((cycleReps - prevCycleReps) / 2);
                    }

                    cycleReps = Math.floor(cycleReps) || 1;
                    cycleTime = +new Date();
                }

                if (completedReps + cycleReps > targetReps) {
                    cycleReps = targetReps - completedReps;
                }
            }

            completedReps += cycleReps;
            calcTimeout = setTimeout(calc, 0);

        // Finished - show timings summary
        } else {
            $START.innerHTML = 'Start';
            $COUNTER.style.textDecoration = 'underline';
            if (!showAll) {
                showTimings();
            }
        }
    },

    calc = function () {

        var start, bdT, bnT, bdR, bnR,
            xs = [cycleReps],
            ys = [cycleReps],
            bdRs = [cycleReps],
            bnRs = [cycleReps];


        // Generate random operands

        for (i = 0; i < cycleReps; i++) {
            xs[i] = getRandom();
        }

        if (bdM == 'pow') {
            for (i = 0; i < cycleReps; i++) {
                ys[i] = Math.floor(Math.random() * (MAX_POWER + 1)) + '';
            }

        // No second operand needed for abs and negate
        } else if (bdM != 'abs' && bdM != 'negate') {
            for (i = 0; i < cycleReps; i++) {
                ys[i] = getRandom();
            }
        }


        //********************************************************************//
        //************************** START TIMING ****************************//
        //********************************************************************//


        // BigDecimal

        if (bdM == 'divide') {

            start = +new Date();
            for (i = 0; i < cycleReps; i++) {
                bdRs[i] = new BigDecimal(xs[i])[bdM](new BigDecimal(ys[i]),
                    decimalPlaces, rounding);
            }
            bdT = +new Date() - start;

        // GWT pow argument must be of type number. ICU4J pow argument must be of type BigDecimal
        } else if (bdM == 'pow' && isGWT) {

            start = +new Date();
            for (i = 0; i < cycleReps; i++) {
                bdRs[i] = new BigDecimal(xs[i])[bdM](+ys[i]);
            }
            bdT = +new Date() - start;

        } else if (bdM == 'abs' || bdM == 'negate') {

            start = +new Date();
            for (i = 0; i < cycleReps; i++) {
                bdRs[i] = new BigDecimal(xs[i])[bdM]();
            }
            bdT = +new Date() - start;

        } else {

            start = +new Date();
            for (i = 0; i < cycleReps; i++) {
                bdRs[i] = new BigDecimal(xs[i])[bdM](new BigDecimal(ys[i]));
            }
            bdT = +new Date() - start;

        }


        // BigNumber

        if (bdM == 'pow') {

            start = +new Date();
            for (i = 0; i < cycleReps; i++) {
                bnRs[i] = new BigNumber(xs[i])[bnM](+ys[i]);
            }
            bnT = +new Date() - start;

        } else if (bdM == 'abs' || bdM == 'negate') {

            start = +new Date();
            for (i = 0; i < cycleReps; i++) {
                bnRs[i] = new BigNumber(xs[i])[bnM]();
            }
            bnT = +new Date() - start;

        } else {

            start = +new Date();
            for (i = 0; i < cycleReps; i++) {
                bnRs[i] = new BigNumber(xs[i])[bnM](new BigNumber(ys[i]));
            }
            bnT = +new Date() - start;

        }


        //********************************************************************//
        //**************************** END TIMING ****************************//
        //********************************************************************//


        // Check for mismatches

        for (i = 0; i < cycleReps; i++) {
            bnR = bnRs[i].toString();

            // Remove any trailing zeros from BigDecimal result
            if (isGWT) {
                bdR = bdM == 'compareTo' || isIntOnly
                    ? bdRs[i].toString()
                    : bdRs[i].stripTrailingZeros().toPlainString();
            } else {

                // No toPlainString() or stripTrailingZeros() in ICU4J
                bdR = bdRs[i].toString();

                if (bdR.indexOf('.') != -1) {
                    bdR = bdR.replace(/\.?0+$/, '');
                }
            }

            if (bdR !== bnR) {

                $RESULTS.innerHTML =
                    '<span class="red">Breaking on first mismatch:</span>' +
                    '<br><br>' +xs[i] + '<br>' + bnM + '<br>' + ys[i] +
                    '<br><br>BigDecimal<br>' + bdR + '<br>' + bnR + '<br>BigNumber';

                if (bdM == 'divide') {
                    $RESULTS.innerHTML += '<br><br>Decimal places: ' +
                        decimalPlaces + '<br>Rounding mode: ' + rounding;
                }
                return;
            } else if (showAll) {
                $RESULTS.innerHTML = xs[i] + '<br>' + bnM + '<br>' + ys[i] +
                '<br><br>BigDecimal<br>' + bdR + '<br>' + bnR + '<br>BigNumber';
            }
        }

        bdTotal += bdT;
        bnTotal += bnT;

        updateCounter();
    };


// Event handlers

document.onkeyup = function (evt) {
    evt = evt || window.event;
    if ((evt.keyCode || evt.which) == SPACE_BAR) {
        up = true;
    }
};
document.onkeydown = function (evt) {
    evt = evt || window.event;
    if (up && (evt.keyCode || evt.which) == SPACE_BAR) {
        pause = !pause;
        up = false;
    }
};

// BigNumber methods' radio buttons' event handlers
for (i = 0; i < 9; i++) {
    $INPUTS[i].checked = false;
    $INPUTS[i].disabled = false;
    $INPUTS[i].onclick = function () {
        clear();
        lastRounding = $R.options.selectedIndex;
        $DIV.style.display = 'none';
        bnM = bnMs[this.id];
        $BD.innerHTML = bdM = bdMs[this.id];
    };
}
$INPUTS[1].onclick = function () {
    clear();
    $R.options.selectedIndex = lastRounding;
    $DIV.style.display = 'block';
    bnM = bnMs[this.id];
    $BD.innerHTML = bdM = bdMs[this.id];
};

// Show/hide BigInteger and disable/un-disable division accordingly as BigInteger
// throws an exception if division gives "no exact representable decimal result"
$INT.onclick = function () {
    if (this.checked && $GWT.checked) {
        if ($INPUTS[1].checked) {
            $INPUTS[1].checked = false;
            $INPUTS[0].checked = true;
            $BD.innerHTML = bdMs[$INPUTS[0].id];
            $DIV.style.display = 'none';
        }
        $INPUTS[1].disabled = true;
        $BIGINT.style.display = 'inline';
    } else {
        $INPUTS[1].disabled = false;
        $BIGINT.style.display = 'none';
    }
};
$ICU4J.onclick = function () {
    $INPUTS[1].disabled = false;
    $BIGINT.style.display = 'none';
};
$GWT.onclick = function () {
    if ($INT.checked) {
        if ($INPUTS[1].checked) {
            $INPUTS[1].checked = false;
            $INPUTS[0].checked = true;
            $BD.innerHTML = bdMs[$INPUTS[0].id];
            $DIV.style.display = 'none';
        }
        $INPUTS[1].disabled = true;
        $BIGINT.style.display = 'inline';
    }
};

BigNumber.config({
    DECIMAL_PLACES : 20,
    ROUNDING_MODE : 4,
    EXPONENTIAL_AT: 1E9,
    RANGE: 1E9,
    MODULO_MODE: 1,
    POW_PRECISION: 10000
});

// Set defaults
$MAX.checked = $INPUTS[0].checked = $GWT.checked = true;
$SHOW.checked = $INT.checked = false;
$REPS.value = DEFAULT_REPS;
$DIGITS.value = DEFAULT_DIGITS;
$DP.value = DEFAULT_DECIMAL_PLACES;
$R.option = DEFAULT_ROUNDING;

BigDecimal_GWT = BigDecimal;
BigDecimal = undefined;

// Load ICU4J BigDecimal
script = document.createElement("script");
script.src = ICU4J_URL;
script.onload = script.onreadystatechange = function () {
    if (!script.readyState || /loaded|complete/.test(script.readyState)) {
        script = null;
        BigDecimal_ICU4J = BigDecimal;
        $START.onmousedown = begin;
    }
};
document.getElementsByTagName("head")[0].appendChild(script);


/*

NOTES:


ICU4J
=====
IBM java package: com.ibm.icu.math
pow's argument must be a BigDecimal.
Among other differences, doesn't have .toPlainString() or .stripTrailingZeros().
Exports BigDecimal only.
Much faster than gwt on Firefox, on Chrome it varies with the method.


GWT
===
Java standard class library: java.math.BigDecimal

Exports:
  RoundingMode
  MathContext
  BigDecimal
  BigInteger

BigDecimal properties:
  ROUND_CEILING
  ROUND_DOWN
  ROUND_FLOOR
  ROUND_HALF_DOWN
  ROUND_HALF_EVEN
  ROUND_HALF_UP
  ROUND_UNNECESSARY
  ROUND_UP
  __init__
  valueOf
  log
  logObj
  ONE
  TEN
  ZERO

BigDecimal instance properties/methods:
( for (var i in new BigDecimal('1').__gwt_instance.__gwtex_wrap) {...} )

  byteValueExact
  compareTo
  doubleValue
  equals
  floatValue
  hashCode
  intValue
  intValueExact
  max
  min
  movePointLeft
  movePointRight
  precision
  round
  scale
  scaleByPowerOfTen
  shortValueExact
  signum
  stripTrailingZeros
  toBigInteger
  toBigIntegerExact
  toEngineeringString
  toPlainString
  toString
  ulp
  unscaledValue
  longValue
  longValueExact
  abs
  add
  divide
  divideToIntegralValue
  multiply
  negate
  plus
  pow
  remainder
  setScale
  subtract
  divideAndRemainder

*/

  </script>
</body>
</html>