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" 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(); } }

希望本文所述对大家JavaScript程序设计有所帮助。