操作方法
新建html文档。
书写hmtl代码。<canvas id="demo" width="400" height="500">当前浏览器不支持canvas</canvas>
书写css代码。<style>*{ margin:0; padding:0; list-style:none;}#demo{position: absolute; left: 50%; top: 50%; border: 1px solid #000; margin:-250px 0 0 -200px;}</style>
书写并添加js代码。<script>function funLoad(){ var cxt = document.getElementById('demo').getContext('2d') ; cxt.beginPath() ; cxt.lineWidth = 2 ; cxt.strokeStyle = 'green' ; cxt.moveTo(33,43) ; cxt.quadraticCurveTo(55,40,124,73) ; cxt.moveTo(33,43) ; cxt.lineTo(68,140) ; cxt.moveTo(33,43) ; cxt.quadraticCurveTo(73,92,89,130) ; cxt.quadraticCurveTo(75,127,81,136) ; cxt.lineTo(73,136) ; cxt.lineTo(74,139) ; cxt.quadraticCurveTo(36,164,24,213) ; cxt.bezierCurveTo(52,215,49,223,41,233) ; cxt.quadraticCurveTo(61,235,76,243) ; cxt.bezierCurveTo(88,350,290,350,309,252) ; cxt.quadraticCurveTo(320,239,353,234) ; cxt.bezierCurveTo(338,223,354,215,371,214) ; cxt.quadraticCurveTo(360,169,325,144) ; cxt.lineTo(333,121) ; cxt.quadraticCurveTo(317,100,341,97) ; cxt.lineTo(361,43) ; cxt.quadraticCurveTo(307,48,266,75) ; cxt.moveTo(361,43) ; cxt.quadraticCurveTo(332,72,304,133) ; cxt.quadraticCurveTo(318,127,313,134) ; cxt.quadraticCurveTo(323,132,318,140) ; cxt.quadraticCurveTo(324,136,325,144) cxt.moveTo(266,75) ; cxt.quadraticCurveTo(265,90,243,94) ; cxt.lineTo(133,112) ; cxt.quadraticCurveTo(90,116,107,91) ; cxt.quadraticCurveTo(147,29,223,27) ; cxt.quadraticCurveTo(272,38,266,75) ; cxt.moveTo(107,91) ; cxt.quadraticCurveTo(111,110,144,100) ; cxt.lineTo(244,80) ; cxt.quadraticCurveTo(264,76,267,61) ; cxt.moveTo(196,30) ; cxt.lineTo(176,51) ; cxt.quadraticCurveTo(224,43,240,66) ; cxt.quadraticCurveTo(252,55,264,53) ; cxt.moveTo(186,38) ; cxt.lineTo(198,37) ; cxt.moveTo(176,43) ; cxt.lineTo(190,43) ; cxt.moveTo(186,53) ; cxt.lineTo(194,45) ; cxt.moveTo(200,45) ; cxt.lineTo(196,54) ; cxt.moveTo(210,47) ; cxt.lineTo(205,54) ; cxt.moveTo(219,49) ; cxt.lineTo(213,54) ; cxt.moveTo(229,50) ; cxt.lineTo(222,59) ; cxt.moveTo(237,52) ; cxt.lineTo(232,65) ; cxt.moveTo(244,56) ; cxt.lineTo(250,66) ; cxt.moveTo(252,52) ; cxt.lineTo(261,62) ; cxt.stroke() ; cxt.beginPath() ; cxt.lineWidth = 10 ; cxt.moveTo(99,123) ; cxt.lineTo(169,164) ; cxt.moveTo(220,172) ; cxt.lineTo(291,130) ; cxt.stroke() ; cxt.beginPath() ; cxt.lineWidth = 2 ; cxt.moveTo(88,168) ; cxt.lineTo(174,188) ; cxt.moveTo(212,180) ; cxt.lineTo(297,199) ; cxt.moveTo(87,173) ; cxt.lineTo(126,286) ; cxt.moveTo(80,204) ; cxt.lineTo(108,191) ; cxt.moveTo(91,220) ; cxt.lineTo(111,211) ; cxt.moveTo(96,236) ; cxt.lineTo(114,226) ; cxt.moveTo(106,248) ; cxt.lineTo(119,243) ; cxt.moveTo(106,267) ; cxt.lineTo(124,259) ; cxt.moveTo(117,276) ; cxt.lineTo(126,272) ; cxt.moveTo(106,171) ; cxt.bezierCurveTo(109,200,142,204,159,185) ; cxt.moveTo(230,184) ; cxt.bezierCurveTo(233,210,267,218,284,197) ; cxt.moveTo(123,253) ; cxt.quadraticCurveTo(193,275,272,253) ; cxt.bezierCurveTo(260,300,120,290,123,253) ; cxt.stroke() ; cxt.beginPath() ; cxt.lineWidth = 1 ; cxt.moveTo(125,260) ; cxt.lineTo(134,263) ; cxt.lineTo(136,259) ; cxt.lineTo(139,265) ; cxt.lineTo(155,270) ; cxt.moveTo(237,270) ; cxt.lineTo(252,266) ; cxt.lineTo(254,258) ; cxt.lineTo(258,264) ; cxt.lineTo(268,261) ; cxt.stroke() ; cxt.beginPath() ; cxt.lineWidth = 2 ; cxt.fillStyle = 'green' ; cxt.save() ; cxt.translate(133,179) ; cxt.rotate(Math.PI*2/20) ; cxt.arc(0,0,5,3,Math.PI*2,true) ; cxt.fill() ; cxt.restore() ; cxt.beginPath() ; cxt.save() ; cxt.translate(254,190) ; cxt.rotate(Math.PI*2/20) ; cxt.arc(0,0,5,3,Math.PI*2,true) ; cxt.fill() ; cxt.restore() ; cxt.beginPath() ; cxt.moveTo(190,212) ; cxt.bezierCurveTo(150,214,150,246,190,246) ; cxt.bezierCurveTo(230,246,230,214,190,212) ; cxt.fill() ; cxt.beginPath() ; cxt.fillStyle = '#fff' ; cxt.moveTo(162,224) ; cxt.quadraticCurveTo(171,212,180,224); cxt.quadraticCurveTo(171,234,162,224); cxt.fill() ; cxt.beginPath() ; cxt.moveTo(119,306) ; cxt.quadraticCurveTo(132,334,205,363) ; cxt.quadraticCurveTo(256,334,264,310) ; cxt.moveTo(110,300) ; cxt.quadraticCurveTo(86,334,81,370) ; cxt.quadraticCurveTo(67,371,66,394) ; cxt.bezierCurveTo(60,418,71,427,76,421) ; cxt.moveTo(76,399) ; cxt.bezierCurveTo(70,419,85,434,89,421) ; cxt.quadraticCurveTo(79,414,85,399) ; cxt.moveTo(89,421) ; cxt.bezierCurveTo(98,430,102,430,99,400) ; cxt.moveTo(101,410) ; cxt.quadraticCurveTo(119,419,112,400) ; cxt.bezierCurveTo(105,388,114,378,101,371) ; cxt.moveTo(100,376) ; cxt.quadraticCurveTo(109,324,126,315) ; cxt.moveTo(280,299) ; cxt.quadraticCurveTo(310,340,312,371) ; cxt.quadraticCurveTo(326,376,326,398) ; cxt.bezierCurveTo(330,415,326,426,318,420) ; cxt.moveTo(317,399) ; cxt.bezierCurveTo(323,419,313,433,305,422) ; cxt.moveTo(309,400) ; cxt.bezierCurveTo(310,425,291,442,292,403) ; cxt.moveTo(292,410) ; cxt.bezierCurveTo(284,416,274,413,282,397) ; cxt.quadraticCurveTo(280,375,293,371) ; cxt.moveTo(294,376) ; cxt.quadraticCurveTo(289,338,267,314) ; cxt.stroke() ; cxt.beginPath() ; cxt.lineWidth = 3 ; cxt.moveTo(127,319) ; cxt.bezierCurveTo(90,470,310,460,262,317) ; cxt.moveTo(188,389) ; cxt.lineTo(197,399) ; cxt.moveTo(190,402) ; cxt.lineTo(195,391) ; cxt.stroke() ; cxt.beginPath() ; cxt.save() ; cxt.translate(194,396) ; cxt.arc(0,0,10,1,Math.PI*2,false) ; cxt.restore() ; cxt.stroke() ; cxt.beginPath() ; cxt.lineWidth = 2 ; cxt.moveTo(144,406) ; cxt.lineTo(127,434) ; cxt.lineTo(136,449) ; cxt.moveTo(152,417) ; cxt.lineTo(142,434) ; cxt.moveTo(139,431) ; cxt.lineTo(151,450) ; cxt.bezierCurveTo(110,441,90,464,105,476) ; cxt.lineTo(156,476) ; cxt.bezierCurveTo(175,473,170,459,151,450) ; cxt.moveTo(126,455) ; cxt.quadraticCurveTo(106,456,108,474) ; cxt.moveTo(139,457) ; cxt.quadraticCurveTo(121,459,125,474) ; cxt.moveTo(244,416) ; cxt.lineTo(252,433) ; cxt.moveTo(255,430) ; cxt.lineTo(245,450) ; cxt.moveTo(254,406) ; cxt.lineTo(269,433) ; cxt.lineTo(261,448) ; cxt.bezierCurveTo(218,456,220,472,234,475) ; cxt.lineTo(289,475) ; cxt.bezierCurveTo(304,467,302,452,261,448) ; cxt.moveTo(255,457) ; cxt.quadraticCurveTo(275,461,268,474) ; cxt.moveTo(270,455) ; cxt.quadraticCurveTo(291,462,285,474) ; cxt.moveTo(198,428) ; cxt.quadraticCurveTo(203,453,228,458) ; cxt.moveTo(236,453) ; cxt.bezierCurveTo(213,440,214,437,248,448) ; cxt.bezierCurveTo(230,430,230,428,251,433) ; cxt.moveTo(275,450) ; cxt.quadraticCurveTo(287,432,287,416) ; cxt.quadraticCurveTo(270,420,255,412) ; cxt.stroke() ;}funLoad() ;</script>
代码整体结构。
查看效果。