<!DOCTYPE html><html><head> <meta charset="UTF-8"> <title>Title</title></head><body> <!-- <canvas id="myCanvas" width="500" height="500"></canvas> --> <script type="text/javascript"> var canvas=document.createElement("canvas"); canvas.style.height = '500px'; canvas.style.width = '500px'; //var c=document.getElementById("myCanvas"); //var cxt=c.getContext("2d"); var cxt = canvas.getContext("2d"); cxt.fillStyle="#FF0000"; /* x 矩形左上角的 x 坐标 y 矩形左上角的 y 坐标 width 矩形的宽度，以像素计 height 矩形的高度，以像素计 */ cxt.fillRect(0,0,500,500); </script></body>
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