HTML5-canvas的使用方法介绍

  元素用于图形的绘制，通过脚本 (通常是JavaScript)来完成.

标签只是图形容器，您必须使用脚本来绘制图形。

你可以通过多种方法使用Canva绘制路径,盒、圆、字符以及添加图像。

<span style="color: #008000"><!--</span><span style="color: #008000">fillStyle是填充样式，如果不设置fillStyle属性，默认填充色为黑色，fillRect是画一个矩形，参数为X,Y,Width,Height</span><span style="color: #008000">--></span><span style="color: #0000ff"><span style="color: #ff00ff">DOCTYPE html</span><span style="color: #0000ff">&gt;</span><span style="color: #0000ff"><span style="color: #800000">html</span><span style="color: #0000ff">&gt;</span><span style="color: #0000ff"><span style="color: #800000">head</span><span style="color: #0000ff">&gt;</span><span style="color: #0000ff"><span style="color: #800000">meta </span><span style="color: #ff0000">charset</span><span style="color: #0000ff">="UTF-8"</span><span style="color: #ff0000"> name</span><span style="color: #0000ff">="author"</span><span style="color: #ff0000"> content</span><span style="color: #0000ff">="赵慧娟"</span><span style="color: #0000ff">&gt;</span><span style="color: #0000ff"><span style="color: #800000">title</span><span style="color: #0000ff">&gt;</span><span style="color: #800000">title</span><span style="color: #0000ff">&gt;</span><span style="color: #0000ff"><span style="color: #800000">script </span><span style="color: #ff0000">src</span><span style="color: #0000ff">="Scripts/jquery-1.10.2.js?1.1.10"</span><span style="color: #0000ff">&gt;</span><span style="color: #800000">script</span><span style="color: #0000ff">&gt;</span><span style="color: #0000ff"><span style="color: #800000">script </span><span style="color: #ff0000">type</span><span style="color: #0000ff">="text/javascript"</span><span style="color: #0000ff">&gt;</span><span style="background-color: #f5f5f5; color: #000000">$(</span><span style="background-color: #f5f5f5; color: #0000ff">function</span><span style="background-color: #f5f5f5; color: #000000">(){</span><span style="background-color: #f5f5f5; color: #0000ff">var</span><span style="background-color: #f5f5f5; color: #000000"> canvas</span><span style="background-color: #f5f5f5; color: #000000">=</span><span style="background-color: #f5f5f5; color: #000000">document.getElementById(</span><span style="background-color: #f5f5f5; color: #000000">"</span><span style="background-color: #f5f5f5; color: #000000">myCanvas</span><span style="background-color: #f5f5f5; color: #000000">"</span><span style="background-color: #f5f5f5; color: #000000">)</span><span style="background-color: #f5f5f5; color: #0000ff">var</span><span style="background-color: #f5f5f5; color: #000000"> ctx</span><span style="background-color: #f5f5f5; color: #000000">=</span><span style="background-color: #f5f5f5; color: #000000">canvas.getContext(</span><span style="background-color: #f5f5f5; color: #000000">"</span><span style="background-color: #f5f5f5; color: #000000">2d</span><span style="background-color: #f5f5f5; color: #000000">"</span><span style="background-color: #f5f5f5; color: #000000">);                ctx.fillStyle</span><span style="background-color: #f5f5f5; color: #000000">=</span><span style="background-color: #f5f5f5; color: #000000">"</span><span style="background-color: #f5f5f5; color: #000000">deeppink</span><span style="background-color: #f5f5f5; color: #000000">"</span><span style="background-color: #f5f5f5; color: #000000">;                ctx.fillRect(</span><span style="background-color: #f5f5f5; color: #000000">10</span><span style="background-color: #f5f5f5; color: #000000">,</span><span style="background-color: #f5f5f5; color: #000000">10</span><span style="background-color: #f5f5f5; color: #000000">,</span><span style="background-color: #f5f5f5; color: #000000">100</span><span style="background-color: #f5f5f5; color: #000000">,</span><span style="background-color: #f5f5f5; color: #000000">100</span><span style="background-color: #f5f5f5; color: #000000">);<br> <span style="color: #339966"> //ctx.moveTo(0,0);//定义开始坐标</span><br><span style="color: #339966">　//ctx.lineTo(100,100);//定义结束坐标</span><br><span style="color: #339966">　//ctx.stroke();//绘制线条</span><br></span></span></span></span></span></span></span></span>

            })<canvas></canvas>