html 5 canvas入门函数简介
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互联网集市收集整理的这篇技术教程文章主要介绍了html 5 canvas入门函数简介，小编现在分享给大家，供广大互联网技能从业者学习和参考。文章包含7116字，纯文字阅读大概需要11分钟。
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1.画布标签 <canvas id="myCanvas" width=450 height=300 margin-top =0px;margin-left=0px style="border:1px solid #c3c3c3;">
上例画出画布，并设置其大小和边框风格，对齐方式，与普通标签属性基本相同，不做详细介绍。
2.在canvas画布上作画，需要用javascript函数对其进行控制，使用以下语句获得API接口实例，对画布进行操作：
var canvas = document.getElementById("myCanvas");
var context = canvas.getContext("2d");
看到2d是否会联想到令人激动的3d？可惜的是，canvas目前还没有3d这么一说
3.画线：
context.moveTo(x1, y1);
context.lineTo(x2, y2);
画出从x1,y1到x2,y2的线段，可以用：
context.strokeStyle = "black";
context.lineWidth = 2;
设置线条的属性
4.画矩形：
示例代码如下，注释中有对函数的解释：
<TABLE style=‘margin: 0px !important; padding: 0px !important; border-radius: 0px !important; border: 1px solid rgb(192, 192, 192) !important; left: auto !important; top: auto !important; width: 726px; text-align: left !important; right: auto !important; line-height: 1.1em !important; font-family: Consolas, "Bitstream Vera Sans Mono", "Courier New", Courier, monospace !important; font-size: 1em !important; font-style: normal !important; font-weight: normal !important; float: none !important; border-collapse: collapse; position: static !important; -ms-overflow-x: visible !important; -ms-overflow-y: visible !important; min-height: inherit !important; outline-width: 0px !important; box-sizing: content-box !important; background-image: none !important; background-clip: padding-box; border-image: initial; -webkit-border-horizontal-spacing: 0px; -webkit-border-vertical-spacing: 0px; -webkit-background-clip: padding-box;‘
border="0" cellspacing="0" cellpadding="0">
<TBODY style=‘border-width: 0px !important; margin: 0px !important; padding: 0px !important; border-radius: 0px !important; left: auto !important; top: auto !important; width: auto !important; text-align: left !important; right: auto !important; line-height: 1.1em !important; font-family: Consolas, "Bitstream Vera Sans Mono", "Courier New", Courier, monospace !important; font-size: 1em !important; font-style: normal !important; font-weight: normal !important; float: none !important; position: static !important; -ms-overflow-x: visible !important; -ms-overflow-y: visible !important; min-height: inherit !important; outline-width: 0px !important; box-sizing: content-box !important; background-image: none !important; background-clip: padding-box; border-image: initial; -webkit-background-clip: padding-box;‘>
<TR style=‘border-width: 0px !important; margin: 0px !important; padding: 0px !important; border-radius: 0px !important; left: auto !important; top: auto !important; width: auto !important; text-align: left !important; right: auto !important; line-height: 1.1em !important; font-family: Consolas, "Bitstream Vera Sans Mono", "Courier New", Courier, monospace !important; font-size: 1em !important; font-style: normal !important; font-weight: normal !important; float: none !important; position: static !important; -ms-overflow-x: visible !important; -ms-overflow-y: visible !important; min-height: inherit !important; outline-width: 0px !important; box-sizing: content-box !important; background-image: none !important; background-clip: padding-box; border-image: initial; -webkit-background-clip: padding-box;‘>
<TD class="gutter" style=‘border-width: 0px !important; margin: 0px !important; padding: 5px !important; border-radius: 0px !important; left: auto !important; top: auto !important; width: auto !important; text-align: left !important; right: auto !important; color: rgb(0, 0, 0) !important; line-height: 1.1em !important; font-family: Consolas, "Bitstream Vera Sans Mono", "Courier New", Courier, monospace !important; font-size: 1em !important; font-style: normal !important; font-weight: normal !important; float: none !important; position: static !important; -ms-overflow-x: visible !important; -ms-overflow-y: visible !important; min-height: inherit !important; outline-width: 0px !important; box-sizing: content-box !important; background-image: none !important; background-clip: padding-box; border-image: initial; -webkit-background-clip: padding-box;‘>
<DIV class="line number1 index0 alt2" style=‘border-width: 0px 3px 0px 0px !important; margin: 0px !important; padding: 0px 0.5em 0px 1em !important; border-radius: 0px !important; left: auto !important; top: auto !important; width: auto !important; text-align: right !important; right: auto !important; line-height: 1.1em !important; font-family: Consolas, "Bitstream Vera Sans Mono", "Courier New", Courier, monospace !important; font-size: 1em !important; font-style: normal !important; font-weight: normal !important; border-right-color: rgb(108, 226, 108) !important; border-right-style: solid !important; float: none !important; white-space: nowrap; position: static !important; -ms-overflow-x: visible !important; -ms-overflow-y: visible !important; min-height: inherit !important; outline-width: 0px !important; box-sizing: content-box !important; background-image: none !important; background-clip: padding-box; background-color: rgb(250, 250, 250) !important; border-image: initial; -webkit-background-clip: padding-box;‘>1
<DIV class="line number2 index1 alt1" style=‘border-width: 0px 3px 0px 0px !important; margin: 0px !important; padding: 0px 0.5em 0px 1em !important; border-radius: 0px !important; left: auto !important; top: auto !important; width: auto !important; text-align: right !important; right: auto !important; line-height: 1.1em !important; font-family: Consolas, "Bitstream Vera Sans Mono", "Courier New", Courier, monospace !important; font-size: 1em !important; font-style: normal !important; font-weight: normal !important; border-right-color: rgb(108, 226, 108) !important; border-right-style: solid !important; float: none !important; white-space: nowrap; position: static !important; -ms-overflow-x: visible !important; -ms-overflow-y: visible !important; min-height: inherit !important; outline-width: 0px !important; box-sizing: content-box !important; background-image: none !important; background-clip: padding-box; background-color: white !important; border-image: initial; -webkit-background-clip: padding-box;‘>2内容总结
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