<!DOCTYPE html>
<html lang="en">
 <head>
 <meta charset="utf-8">

 <!-- Always force latest IE rendering engine (even in intranet) & Chrome Frame
 Remove this if you use the .htaccess -->
 <meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1">

 <title>test16_color</title>
 <meta name="description" content="">
 <meta name="author" content="Administrator">

 <meta name="viewport" content="width=device-width; initial-scale=1.0">

 <!-- Replace favicon.ico & apple-touch-icon.png in the root of your domain and delete these references -->
 <link rel="shortcut icon" href="/favicon.ico">
 <link rel="apple-touch-icon" href="/apple-touch-icon.png">
 
 <style type="text/css">
  body, div,span {margin: 0;padding: 0;}
  .div1 {margin: 20px auto;border: 1px solid black;width: 400px;height: 250px;opacity: 1;}
  .div2 {margin: 0 auto;width: 600px;text-align: center;}
  span {width: 180px; display: inline-block;text-align: right;}
  span.val {width: 50px;display: inline-block;text-align: left;}
  input {margin: 3px 15px;outline: none;}
  h2 {margin: 3px auto;}
 </style>
 </head>

 <body>
 <div class="div1" id="div1">
  
 </div>
 <div class="div2"> 
  <h2><span>R（紅色）：</span><span class="val" id="rValue">255</span><input type="range" min="0" max="255" value="255" step="1" id="rRange"/></h2>
  <h2><span>G（綠色）：</span><span class="val" id="gValue">255</span><input type="range" min="0" max="255" value="255" step="1" id="gRange"/></h2>
  <h2><span>B（藍色）：</span><span class="val" id="bValue">255</span><input type="range" min="0" max="255" value="255" step="1" id="bRange"/></h2>
  <h2><span>O（透明）：</span><span class="val" id="oValue">1</span><input type="range" min="0" max="1" value="1" step="0.1" id="oRange"/></h2>
  <h2 id="rgb1">RGB(255,255,255)</h2>
  <h2 id="rgb2">#FFFFFF</h2>
 </div>
 </body>
 
 <script type="text/javascript">
 (function() {
  
  var inputNodes = document.getElementsByTagName("input");
  var len = inputNodes.length;
  for(var i=0;i<len;i++) {
  var inputNode = inputNodes[i];
  inputNode.index = i;
  inputNode.onchange = function() {
   var inputVal = inputNodes[this.index].value;
   var inputIdAttr = inputNodes[this.index].getAttribute("id");
   var spanIdAttr = inputIdAttr.replace("Range","Value");
   
   document.getElementById(spanIdAttr).innerHTML = inputVal;
   
   changeColor();
  };
  }
  
  function changeColor() {
  var rgbColor = "";
  var oColor = "#";
  for(var i=0;i<len-1;i++) {
   var inputNode = inputNodes[i];
   rgbColor += rgbColor!=""?",":"";
   rgbColor += inputNode.value;
   
   var n_10 = parseInt(inputNode.value);
   oColor += n_10.toString(16).length==1?"0"+n_10.toString(16):n_10.toString(16);
  }
  
  var div1 = document.getElementById("div1");
  div1.style.background = "RGB("+rgbColor+")";
  div1.style.opacity = inputNodes[len-1].value;
  
  var rgb1 = document.getElementById("rgb1");
  rgb1.innerHTML = "RGB("+rgbColor+")";
  
  var rgb2 = document.getElementById("rgb2"); 
  rgb2.innerHTML = oColor.toUpperCase();
  }
 })();
 </script>
</html>

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