javascript文字彩虹式颜色渐变效果代码实例
分类：实例代码
本章节分享一段代码实例它实现了文字的彩虹式颜色渐变效果。
在实际应用中也是有的，需要的朋友可以做一下参考。
代码实例如下:
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<meta name="author" content="http://www.pipipi.net/" />
<title>前端教程网</title>
<script>
function createHexArray(n){
this.length = n;
for (var index = 1; index <= n; index++){
this[index] = index - 1;
}
this[11] = "A";
this[12] = "B";
this[13] = "C";
this[14] = "D";
this[15] = "E";
this[16] = "F";
return this;
}
hx = new createHexArray(16);
function convertToHex(x){
if (x < 17){
x = 16;
}
var high = x / 16;
var s = high+"";
s = s.substring(0, 2);
high = parseInt(s, 10);
var left = hx[high + 1];
var low = x - high * 16;
if (low < 1){
low = 1;
}
s = low + "";
s = s.substring(0, 2);
low = parseInt(s, 10);
var right = hx[low + 1];
var string = left + "" + right;
return string;
}
function makeRainbow(text,id){
var ele=document.getElementById(id);
var str="";
text = text.substring(0, text.length);
color_d1 = 255;
mul = color_d1 / text.length;
for(var index = 0; index < text.length; index++) {
color_d1 = 255*Math.sin(index / (text.length / 3));
color_h1 = convertToHex(color_d1);
color_d2 = mul * index;
color_h2 = convertToHex(color_d2);
k = text.length;
j = k - index;
if (j < 0){
j = 0;
}
color_d3 = mul * j;
color_h3 = convertToHex(color_d3);
str=str+"<font color=\"#"
+ color_h3 + color_h1 + color_h2
+ "\">" + text.substring(index, index + 1)
+ "</font>";
}
ele.innerHTML=str;
}
window.onload=function(){
makeRainbow("前端教程网的url地址是pipipi.net","show");
}
</script>
</head>
<body>
<div id="show"></div>
</body>
</html>
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