SOURCE

console 命令行工具 X clear

                    
>
console
function draw() {
    var ctx = document.getElementById('canvas').getContext('2d');

    var lingrad = ctx.createLinearGradient(0, 0, 0, 150);
    lingrad.addColorStop(0, '#00ABEB');
    lingrad.addColorStop(0.5, '#fff');
    lingrad.addColorStop(0.5, '#26C000');
    lingrad.addColorStop(1, '#fff');

    var lingrad2 = ctx.createLinearGradient(0, 50, 0, 95);
    lingrad2.addColorStop(0.5, '#000');
    lingrad2.addColorStop(1, 'rgba(0,0,0,0)');

    ctx.fillStyle = lingrad;
    ctx.strokeStyle = lingrad2;

    ctx.fillRect(10, 10, 130, 130);
    ctx.strokeRect(50, 50, 50, 50);

}
<html>
 <body onload="draw();">
   <canvas id="canvas" width="300" height="300"></canvas>
 </body>
</html>