如何实现RGB颜色线性渐变
我需要根据变量的属性值设置其不同的颜色，通过RGB控制颜色，颜色是由蓝，绿，黄，红平滑渐变的，哪位大侠能告诉我该如何实现？
2013-08-01 09:28
2013-08-04 12:02
程序代码：<html>
<head>
<title>_bccn_</title>
</head>
<body>
<script>
var s = 0;
(function(){
var label = document.createElement("label");
if (!label){
return;
}
label.innerHTML = "_bccn_";
document.body.appendChild(label);
label.style.fontSize = "20px";
label.style.fontWeight = "bold";
setInterval(function(){
var color;
switch (s){
case 0:
color = "red";
break;
case 1:
color = "blue";
break;
case 2:
color = "green";
break;
default:
color = "black";
break;
}
label.style.color = color;
++s;
if (4 <= s){
s = 0;
}
}, 1000);
})();
</script>
</body>
</html>
2013-08-04 12:20
程序代码：<!DOCTYPE html>
<html>
<style type="text/css">
</style>
<script>
var i = 0;
function onLoad(){
var label = document.getElementsByTagName("label")[0];
label.style.fontSize = "14pt";
label.style.fontWeight = "bolid";
setInterval(function(){
if (i >= 0xffffff){
i = 0;
}
label.style.color = "#" + i;
++i;
}, 100);
}
</script>
<body onload="onLoad()">
<label>Hello body</label>
</body>
</html>
2013-08-11 13:27
2013-08-12 22:46
2013-08-13 20:38
程序代码：for循环中：
var speed = arrList1[i][j];
var col, r, g, b;
if (speed > 2 && speed < 8) {
col = speed - 3;
r = 0;
g = Math.round(col * 51);
b = 255;
}
else if (speed >= 8 && speed < 13) {
col = speed - 8;
r = 0;
g = 255;
b = Math.round(255 - col * 51);
}
else if (speed >= 13 && speed < 18) {
col = speed - 13;
r = Math.round(col * 51);
g = 255;
b = 0;
}
else if (speed >= 18 && speed < 23) {
col = speed - 18;
r = 255;
g = Math.round(255 - col * 51);
b = 0;
}
else {
r = 255;
g = 0;
b = 0;
}r,g,b作为参数传进去分别作为RGB( R,G,B)的变量
2013-08-14 22:13
2013-08-14 23:10
