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JavaScript使用Range调色及透明度实例

作者：tianzitianxie　　发布时间：2024-04-16 10:36:25　

标签：JavaScript,Range

颜色搭配是件头疼的事，工作空隙，利用range做个简单的手动调色，可得到rgb值和相应的十六进制色值。因为用到range标签，建议使用搜狗、火狐，IE10及以上版本代码如下：

<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">


<meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1">

<title>test16_color</title>
<meta name="description" content="">
<meta name="author" content="Administrator">

<meta name="viewport" content="width=device-width; initial-scale=1.0">


<link rel="shortcut icon" href="/favicon.ico">
<link rel="apple-touch-icon" href="/apple-touch-icon.png">

<style type="text/css">
body, div,span {margin: 0;padding: 0;}
.div1 {margin: 20px auto;border: 1px solid black;width: 400px;height: 250px;opacity: 1;}
.div2 {margin: 0 auto;width: 600px;text-align: center;}
span {width: 180px; display: inline-block;text-align: right;}
span.val {width: 50px;display: inline-block;text-align: left;}
input {margin: 3px 15px;outline: none;}
h2 {margin: 3px auto;}
</style>
</head>

<body>
<div class="div1" id="div1">

</div>
<div class="div2">
<h2><span>R（红色）：</span><span class="val" id="rValue">255</span><input type="range" min="0" max="255" value="255" step="1" id="rRange"/></h2>
<h2><span>G（绿色）：</span><span class="val" id="gValue">255</span><input type="range" min="0" max="255" value="255" step="1" id="gRange"/></h2>
<h2><span>B（蓝色）：</span><span class="val" id="bValue">255</span><input type="range" min="0" max="255" value="255" step="1" id="bRange"/></h2>
<h2><span>O（透明）：</span><span class="val" id="oValue">1</span><input type="range" min="0" max="1" value="1" step="0.1" id="oRange"/></h2>
<h2 id="rgb1">RGB(255,255,255)</h2>
<h2 id="rgb2">#FFFFFF</h2>
</div>
</body>

<script type="text/javascript">
(function() {

var inputNodes = document.getElementsByTagName("input");
var len = inputNodes.length;
for(var i=0;i<len;i++) {
var inputNode = inputNodes[i];
inputNode.index = i;
inputNode.onchange = function() {
var inputVal = inputNodes[this.index].value;
var inputIdAttr = inputNodes[this.index].getAttribute("id");
var spanIdAttr = inputIdAttr.replace("Range","Value");

document.getElementById(spanIdAttr).innerHTML = inputVal;

changeColor();
};
}

function changeColor() {
var rgbColor = "";
var oColor = "#";
for(var i=0;i<len-1;i++) {
var inputNode = inputNodes[i];
rgbColor += rgbColor!=""?",":"";
rgbColor += inputNode.value;

var n_10 = parseInt(inputNode.value);
oColor += n_10.toString(16).length==1?"0"+n_10.toString(16):n_10.toString(16);
}

var div1 = document.getElementById("div1");
div1.style.background = "RGB("+rgbColor+")";
div1.style.opacity = inputNodes[len-1].value;

var rgb1 = document.getElementById("rgb1");
rgb1.innerHTML = "RGB("+rgbColor+")";

var rgb2 = document.getElementById("rgb2");
rgb2.innerHTML = oColor.toUpperCase();
}
})();
</script>
</html>

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JavaScript使用Range调色及透明度实例

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