<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>Document</title> </head> <body> <canvas id="canvas" style="margin:0 auto;"> The current browser does not support Canvas, can replace the browser a try! </canvas> <script> // 绘制矩形 function drawRect(ctx,x,y,width,height,borderWidth,borderColor,fillColor){ ctx.beginPath(); ctx.rect(x,y,width,height) //直接绘制矩形 ctx.closePath(); ctx.lineWidth = borderWidth; ctx.strokeStyle = borderColor; ctx.fillStyle = fillColor; ctx.fill(); ctx.stroke(); } function drawRect2(ctx,x,y,width,height,borderWidth,borderColor,fillColor){ ctx.lineWidth = borderWidth; ctx.strokeStyle = borderColor; ctx.fillStyle = fillColor; ctx.fillRect(x,y,width,height); ctx.strokeRect(x,y,width,height); } window.onload = function(){ var canvas = document.getElementById(‘canvas‘); canvas.width = 1024; canvas.height = 768; if(canvas.getContext(‘2d‘)){ var context = canvas.getContext(‘2d‘); drawRect(context,100,100,400,400,10,"blue","yellow") drawRect2(context,300,300,400,400,10,"red","rgba(0,255,0,0.8)") //后绘制的填充色图形会对前面的图形进行遮挡 }else{ alert(‘当前游览器不支持Canvas，请更换游览器后再试！‘); } } </script> </body> </html>
原文：http://www.cnblogs.com/cynthia-wuqian/p/4978332.html