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Complete example of real-time color gradient effect implemented by JS_javascript skills

WBOYOriginal: 2016-05-16 15:08:101391browse

The example in this article describes the real-time color gradient effect implemented by JS. Share it with everyone for your reference, the details are as follows:

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" >
<head>
<title>无标题页</title>
</head>
<body>
<div id="div1" style="font-size:36px;">我的闪烁文字 abc123</div>
<span id="span1"></span>
<script type="text/javascript">
var begin = getRGB('#33FFAA');
var end = getRGB('#FF0000');
var curColor = getRGB('#33FFAA');
var bo = true;
var rate = getRate(begin, end);
function blink()
{
  window.setInterval(function(){
    curColor.r = getCur(begin.r, end.r, curColor.r, bo, rate.r);
    curColor.g = getCur(begin.g, end.g, curColor.g, bo, rate.g);
    curColor.b = getCur(begin.b, end.b, curColor.b, bo, rate.b);
    document.getElementById('div1').style.color = getColor(curColor);
    document.getElementById('span1').innerHTML = getColor(curColor);
    if(curColor.r == begin.r && curColor.g == begin.g && curColor.b == begin.b)
    {
      bo = true;
    }
    if(curColor.r == end.r && curColor.g == end.g && curColor.b == end.b)
    {
      bo = false;
    }
  } , 100);
}
function getCur(beginValue, endValue, curValue, bo, rateValue)
{
  if(beginValue == endValue)
  {
    return beginValue;
  }
  rateValue = beginValue < endValue &#63; rateValue : -rateValue;
  curValue += bo &#63; rateValue : -rateValue;
  if(curValue < Math.min(beginValue, endValue))
  {
    curValue = Math.min(beginValue, endValue);
  }
  if(curValue > Math.max(beginValue, endValue))
  {
    curValue = Math.max(beginValue, endValue);
  }
  return curValue;
}
function getRate(b, e)
{
  var obj = new Object();
  obj.r = Math.abs(b.r - e.r) / 5;
  obj.g = Math.abs(b.g - e.g) / 5;
  obj.b = Math.abs(b.b - e.b) / 5;
  return obj;
}
function getRGB(color)
{
  var obj = new Object();
  obj.r = parseInt(color.substr(1,2), 16);
  obj.g = parseInt(color.substr(3,2), 16);
  obj.b = parseInt(color.substr(5,2), 16);
  return obj;
}
function getColor(obj)
{
  obj.r = Math.round(obj.r);
  obj.g = Math.round(obj.g);
  obj.b = Math.round(obj.b);
  var color = '#';
  color += (obj.r < 16 &#63; '0':'') + obj.r.toString(16);
  color += (obj.g < 16 &#63; '0':'') + obj.g.toString(16);
  color += (obj.b < 16 &#63; '0':'') + obj.b.toString(16);
  return color;
}
blink();
</script>
</body>
</html>

Readers who are interested in more JavaScript-related content can check out the special topics on this site: "Summary of JavaScript search algorithm techniques", "Summary of JavaScript animation special effects and techniques", "Summary of JavaScript errors and debugging techniques", "Summary of JavaScript data structures and algorithm techniques", "Summary of JavaScript traversal algorithms and techniques" and "JavaScript Mathematics Summary of operation usage》

I hope this article will be helpful to everyone in JavaScript programming.

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Complete example of real-time color gradient effect implemented by JS_javascript skills

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