你必须使用RGB值来设置渐变和使用Javascript动画的。
你可以在下面看到一个随机的例子,或者在附带的笔中。只要连上你的“上滚动” /“轮”事件来触发updateGradient功能:
var colors = new Array(
[62,35,255],
[60,255,60],
[255,35,98],
[45,175,230],
[255,0,255],
[255,128,0]);
var step = 0;
//color table indices for:
// current color left
// next color left
// current color right
// next color right
var colorIndices = [0,1,2,3];
//transition speed
var gradientSpeed = 0.002;
function updateGradient()
{
if ($===undefined) return;
var c0_0 = colors[colorIndices[0]];
var c0_1 = colors[colorIndices[1]];
var c1_0 = colors[colorIndices[2]];
var c1_1 = colors[colorIndices[3]];
var istep = 1 - step;
var r1 = Math.round(istep * c0_0[0] + step * c0_1[0]);
var g1 = Math.round(istep * c0_0[1] + step * c0_1[1]);
var b1 = Math.round(istep * c0_0[2] + step * c0_1[2]);
var color1 = "rgb("+r1+","+g1+","+b1+")";
var r2 = Math.round(istep * c1_0[0] + step * c1_1[0]);
var g2 = Math.round(istep * c1_0[1] + step * c1_1[1]);
var b2 = Math.round(istep * c1_0[2] + step * c1_1[2]);
var color2 = "rgb("+r2+","+g2+","+b2+")";
$('#gradient').css({
background: "-webkit-gradient(linear, left top, right top, from("+color1+"), to("+color2+"))"}).css({
background: "-moz-linear-gradient(left, "+color1+" 0%, "+color2+" 100%)"});
step += gradientSpeed;
if (step >= 1)
{
step %= 1;
colorIndices[0] = colorIndices[1];
colorIndices[2] = colorIndices[3];
//pick two new target color indices
//do not pick the same as the current one
colorIndices[1] = (colorIndices[1] + Math.floor(1 + Math.random() *
(colors.length - 1))) % colors.length;
colorIndices[3] = (colorIndices[3] + Math.floor(1 + Math.random() *
(colors.length - 1))) % colors.length;
}
}
setInterval(updateGradient,10);
http://codepen.io/quasimondo/pen/lDdrF
你想拥有纯色或者是上滚动移动的线性渐变?您使用的示例有纯色,然后在用户滚动并将其设置为背景时计算新的颜色。 –
我希望线性渐变使用#fff,第二种颜色的计算方法与我的示例中类似。 –