艾夏SEO

Canvas总结(1),很细很全很适合初学者,各取所需吧.欢迎留言

// 获取对象 var Canvas = document.querySelector('Canvas'); //获取绘图环境 var ctx = Canvas.getContext('2d'); // 绘制八卦图 // 3.1 大圆 ctx.beginPath(); ctx.arc(250,250,250,0,Math.PI,true);

Document *{ margin: 0; padding: 0; } #box{ width: 500px; height: 500px; border: 1px solid red; posit

<style> #box { width: 500px; height: 500px; position: relative; } #shadow { width: 200px; height: 200px; background: red; opacity: 0

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