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<!DOCTYPE html>
<html>
<head>
<script src="http://code.jquery.com/jquery-1.9.1.min.js"></script>
  <meta charset="utf-8">
  <title>JS Bin</title>
</head>
<body>
        <table>
            <tr id="top">
                <th>最小值</th> 
                <th>中位數</th> 
                <th>最大值</th> 
            </tr>
            <tr class="box">
                <td class="cg">13.947</td> 
                <td class="cg">15.9671</td> 
                <td class="cg">16.9874</td> 
            <tr class="box">
                <td class="cg">1.6035</td> 
                <td class="cg">1.6036</td> 
                <td class="cg">1.6066</td> 
            </tr>
            <tr class="box">
                <td class="cg">0.9547</td> 
                <td class="cg">0.9548</td> 
                <td class="cg">0.9558</td> 
            </tr>   
        
        </table>
</body>
</html>
 
table{
  border-collapse: collapse;
  border:   1px solid black;
}
tr, th, td{
  border: 1px solid black;
  padding:0px 20px;
  text-align:center;
}
​
 
$(document).ready(function(){
  setInterval(getRandom, 2000);
});
​
var getRandom = function(){
    var x = random(1, 20, false); 
    var $cg = $('.cg');
    var cgLength = $cg.length;
    var index = random(0, cgLength - 1, true);
  
    $cg.eq(index).css('background-color', 'red');
    setTimeout(function(){
      $cg.eq(index).html(x);
      $cg.eq(index).css('background-color', '');
    }, 500);
    
};
​
var random = function(minNum, maxNum, isInt) {
  var num = Math.random() * (maxNum - minNum + 1);
  if (isInt) {
    n = Math.floor(num) + minNum;
  } else {
    n = num + minNum;
    n = formatFloat(n, 3);
  }
  return n;
};
​
var formatFloat = function(num, pos) {
  var size = Math.pow(10, pos);
  return Math.round(num * size) / size;
};
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