html5 学习简单的拾色器

更新时间:2023-04-03 07:36:56 阅读：评论：0

下面是源码需要浏览器支持html5

复制代码代码如下:

<html>

<head>

</head>

<body>

<canvas id=”colorpicker” onmoumove=”showcurrentcolor(event)”>

</canvas>
影响股票价格的因素
<br/>

<div id=”textresult”>

</div>

<script type=”text/javascript”>

if(document.createelement(“canvas”)){

if(document.getelementbyid(“colorpicker”).getcontext){

var can = document.getelementbyid(“colorpicker”);

can.tattribute(“height”,300);

var cxt = can.getcontext(“2d”);

var gradient = cxt.createlineargradient(0.5,0.5,0,150);

gradient.addcolorstop(0,’#00ff00′);

gradient.addcolorstop(1,’#ff0000′);

cxt.fillstyle=gradient;

cxt.fillrect(0,0,60,支付宝密码修改200);

var ox= can.offtleft

var oy = can.offttop;

var span = document.createelement(“input”);

span.tattribute(“id”,”rgba”);

document.getelementbyid(“textres促销策略分析ult”).appendchild(span);

}

}

function showcurrentcolor(e){

var x = e.clientx – 8;

var y = e.clienty – 29;

var w = 10;

if(document.createelement(“canvas”)){

if(document.getelementbyid(“colorpicker”).getcontext){

var can = document.getelementbyid(“colorpicker”);

var cxt = can.getcontext(“2d”);

var gradient = cxt.createlineargradient(0.5,0.5,0,150);

var span = document.getelementbyid(“rgba”);

var imgdatas = cxt.getimagedata(ox,oy,10,200);

var imgdata = imgdatas.data;

var g = imgdata[4 *(w)*(y)+(x)*4 + 1];

var r = imgdata[4 *(w)*(y)+(x)*4];

var b = imgdata[4 *(w)*(y)+(x)*4 + 2];

var a = imgdata[4 *(w)*(y)+(x)*4 + 3];

span.value微信公众平台怎么用=”r=”+r+” g=”+ g+” b=建设银行贷款利率表221;+b +” a=”+a;

document.getelementbyid(“textresult”).appendchild(span);

}

}

}

</script>

</body>

</html>