如何通过JS实现颜色实时渐变效果？
本文实例讲述了JS实现的颜色实时渐变效果。分享给大家供大家参考，具体如下：
<!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 ? rateValue : -rateValue;
curValue += bo ? 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 ? '0':'') + obj.r.toString(16);
color += (obj.g < 16 ? '0':'') + obj.g.toString(16);
color += (obj.b < 16 ? '0':'') + obj.b.toString(16);
return color;
}
blink();
</script>
</body>
</html>
希望本文所述对大家JavaScript程序设计有所帮助。
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