本文实例讲述了JavaScript+canvas实现七色板效果。分享给大家供大家参考，具体如下：
效果图如下：
html：
<canvas id="canvas" class="canvas" width="600" height="600"></canvas>
css：
html,body{margin: 0;padding: 0}
.canvas{display: block; margin-left:auto;margin-right:auto;margin-top: 50px;}
javascript：
var disk = [
{
area:[{x:0,y:0},{x:600,y:0},{x:300,y:300}],
color:"#CBF263"
},
{
area:[{x:0,y:0},{x:0,y:600},{x:300,y:300}],
color:"#5CB6D0"
},
{
area:[{x:0,y:600},{x:300,y:600},{x:150,y:450}],
color:"#FE9CCD"
},
{
area:[{x:150,y:450},{x:300,y:300},{x:450,y:450},{x:300,y:600}],
color:"#A696C3"
},
{
area:[{x:300,y:600},{x:600,y:600},{x:600,y:300}],
color:"#FBC421"
},
{
area:[{x:600,y:300},{x:600,y:0},{x:450,y:150},{x:450,y:450}],
color:"#FF5061"
},
{
area:[{x:450,y:450},{x:450,y:150},{x:300,y:300}],
color:"#FDEA11"
}
]
window.onload = function(){
var canvasDom = document.getElementById("canvas");
var ctx = canvasDom.getContext("2d");
drawDisk(disk,ctx)
}
function drawDisk(disk,ctx){
for(var i = 0;i<disk.length;i++){
ctx.beginPath();
ctx.moveTo(disk[i].area[0].x,disk[i].area[0].y);
for(var j = 1;j<disk[i]["area"].length;j++){
ctx.lineTo(disk[i].area[j].x,disk[i].area[j].y);
}
ctx.closePath();
ctx.fillStyle = disk[i]["color"];
ctx.fill();
}
}
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希望本文所述对大家JavaScript程序设计有所帮助。