<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>颜色区域中间的值获取</title>
<style>
.div{
width: 120px;
height: 800px;
border: 1px solid;
margin-left: 10px;
}
.flex{
display: flex;
}
.lin{
background: -webkit-linear-gradient(top, #076cff 0%, #ffffff 100%);
}
</style>
</head>
<body>
<div class="flex">
<div class="div lin"></div>
<div class="div con1"></div>
<div class="div con2"></div>
</div>
<script>
var parseColor = function (hexStr) {
return hexStr.length === 4 ? hexStr.substr(1).split('').map(function (s) { return 0x11 * parseInt(s, 16); }) : [hexStr.substr(1, 2), hexStr.substr(3, 2), hexStr.substr(5, 2)].map(function (s) { return parseInt(s, 16); })
};
// zero-pad 1 digit to 2
var pad = function (s) {
return (s.length === 1) ? '0' + s : s;
};
/*
start 开始颜色
end 结束颜色
steps 颜色分解 次数
gamma 暂时理解为透明一点（伽马）
*/
var gradientColors = function (start, end, steps, gamma) {
var i, j, ms, me, output = [], so = [];
gamma = gamma || 1;
var normalize = function (channel) {
return Math.pow(channel / 255, gamma);
};
start = parseColor(start).map(normalize);
end = parseColor(end).map(normalize);
for (i = 0; i < steps; i++) {
ms = i / (steps - 1);
me = 1 - ms;
for (j = 0; j < 3; j++) {
so[j] = pad(Math.round(Math.pow(start[j] * me + end[j] * ms, 1 / gamma) * 255).toString(16));
}
output.push('#' + so.join(''));
}
return output;
};
var con1 = document.querySelector(".con1")
var con2 = document.querySelector(".con2")
var color1 = gradientColors( '#ffffff','#0037ff', 34)
console.log(color1);
// 泥萌的新需求
var color2 = gradientColors('#00ff00', '#ff0000', 100, 2.2)
console.log(color2);
load(con1,color1)
load(con2,color2)
function load(ele,colorArr){
var h = ele.clientHeight/colorArr.length
colorArr.forEach(e => {
var div = document.createElement('div')
div.style.background = e
div.style.height = h +'px'
ele.appendChild(div)
});
}
</script>
</body>
</html>
