<!DOCTYPE html> <html> <head> <meta charset="UTF-8"> <title>canvas</title> <script type="text/javascript" src="../js/jQuery.js"></script> <style type="text/css"> *{ margin: 0; padding: 0; outline: none; border: none; } #canvas{ width: 7rem; margin: .25rem 0 0 1.5rem; border: 1px solid black; } </style> </head> <body> <canvas id="canvas" width="1000" height="600"></canvas> </body> </html> <script type="text/javascript"> /** * rem 布局初始化 */ $('html').css('font-size', $(window).width()/10); /** * 获取 canvas 画布 * 获取 canvas 绘图上下文环境 */ var canvas = $('#canvas')[0]; var cxt = canvas.getContext('2d'); /** * 文字的对齐 * textAlign: left center right */ /* cxt.fillStyle = "blue"; cxt.font = "bold 40px sans-serif"; cxt.textAlign = "left"; cxt.fillText("Hello Canvas", 500, 200); cxt.textAlign = "center"; cxt.fillText("Hello Canvas", 500, 300); cxt.textAlign = "right"; cxt.fillText("Hello Canvas", 500, 400); cxt.moveTo(500, 0); cxt.lineTo(500, 600); cxt.stroke(); */ /* * 文字对齐 * textBaseLine: top, middle, bottom, alphabetic(拉丁文字), ideographic(汉字), hanging(印度文字) */ cxt.fillStyle = "blue"; cxt.font = "bold 40px sans-serif"; cxt.textBaseline = "top"; cxt.fillText("Hello Canvas", 100, 100); cxt.textBaseline = "middle"; cxt.fillText("Hello Canvas", 100, 300); cxt.textBaseline = "bottom"; cxt.fillText("Hello Canvas", 100, 500); cxt.moveTo(0, 100); cxt.lineTo(1000, 100); cxt.moveTo(0, 300); cxt.lineTo(1000, 300); cxt.moveTo(0, 500); cxt.lineTo(1000, 500); cxt.stroke(); </script>