{"id":238576,"date":"2023-12-26T09:54:25","date_gmt":"2023-12-26T01:54:25","guid":{"rendered":"https:\/\/www.idc.net\/help\/238576\/"},"modified":"2023-12-26T09:54:25","modified_gmt":"2023-12-26T01:54:25","slug":"html%e4%bb%a3%e7%a0%81-canvas-%e7%94%bb%e5%b8%83%e5%85%83%e7%b4%a0","status":"publish","type":"post","link":"https:\/\/idc.net\/help\/238576\/","title":{"rendered":"Html\u4ee3\u7801: canvas &#8211; \u753b\u5e03\u5143\u7d20"},"content":{"rendered":"<p><title id=\"html%e4%bb%a3%e7%a0%81-canvas-%e7%94%bb%e5%b8%83%e5%85%83%e7%b4%a0-bbswINSZXj\">Html\u4ee3\u7801: canvas - \u753b\u5e03\u5143\u7d20<\/title><\/p>\n<h1 id=\"html%e4%bb%a3%e7%a0%81-canvas-%e7%94%bb%e5%b8%83%e5%85%83%e7%b4%a0-bbswINSZXj\">Html\u4ee3\u7801: canvas - \u753b\u5e03\u5143\u7d20<\/h1>\n<h2 id=\"%e4%bb%80%e4%b9%88%e6%98%afhtml%e7%9a%84canvas%e5%85%83%e7%b4%a0%ef%bc%9f-bbswINSZXj\">\u4ec0\u4e48\u662fHTML\u7684canvas\u5143\u7d20\uff1f<\/h2>\n<p>HTML\u7684canvas\u5143\u7d20\u662f\u4e00\u4e2a\u7528\u4e8e\u7ed8\u5236\u56fe\u5f62\u7684\u5bb9\u5668\u3002\u5b83\u53ef\u4ee5\u7528\u4e8e\u7ed8\u5236\u56fe\u50cf\u3001\u56fe\u8868\u3001\u52a8\u753b\u7b49\u3002canvas\u5143\u7d20\u662fHTML5\u4e2d\u7684\u4e00\u4e2a\u65b0\u7279\u6027\uff0c\u5b83\u63d0\u4f9b\u4e86\u4e00\u79cd\u5728\u7f51\u9875\u4e0a\u7ed8\u5236\u56fe\u5f62\u7684\u65b9\u5f0f\uff0c\u4f7f\u5f00\u53d1\u8005\u53ef\u4ee5\u901a\u8fc7JavaScript\u6765\u63a7\u5236\u7ed8\u56fe\u8fc7\u7a0b\u3002<\/p>\n<h2 id=\"%e5%a6%82%e4%bd%95%e4%bd%bf%e7%94%a8canvas%e5%85%83%e7%b4%a0%ef%bc%9f-bbswINSZXj\">\u5982\u4f55\u4f7f\u7528canvas\u5143\u7d20\uff1f<\/h2>\n<p>\u8981\u4f7f\u7528canvas\u5143\u7d20\uff0c\u9996\u5148\u9700\u8981\u5728HTML\u6587\u6863\u4e2d\u6dfb\u52a0\u4e00\u4e2acanvas\u6807\u7b7e\uff1a<\/p>\n<pre><code>&lt;canvas id=\"myCanvas\" width=\"500\" height=\"300\"&gt;&lt;\/canvas&gt;<\/code><\/pre>\n<p>\u5728\u4e0a\u9762\u7684\u4ee3\u7801\u4e2d\uff0c\u6211\u4eec\u521b\u5efa\u4e86\u4e00\u4e2aid\u4e3a\"myCanvas\"\u7684canvas\u5143\u7d20\uff0c\u5e76\u6307\u5b9a\u4e86\u5b83\u7684\u5bbd\u5ea6\u4e3a500\u50cf\u7d20\uff0c\u9ad8\u5ea6\u4e3a300\u50cf\u7d20\u3002<\/p>\n<p>\u63a5\u4e0b\u6765\uff0c\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528JavaScript\u6765\u83b7\u53d6canvas\u5143\u7d20\uff0c\u5e76\u5728\u5176\u4e0a\u7ed8\u5236\u56fe\u5f62\uff1a<\/p>\n<pre><code>var canvas = document.getElementById(\"myCanvas\");\nvar ctx = canvas.getContext(\"2d\");\nctx.fillStyle = \"red\";\nctx.fillRect(0, 0, 200, 200);<\/code><\/pre>\n<p>\u5728\u4e0a\u9762\u7684\u4ee3\u7801\u4e2d\uff0c\u6211\u4eec\u9996\u5148\u4f7f\u7528getElementById\u65b9\u6cd5\u83b7\u53d6\u4e86id\u4e3a\"myCanvas\"\u7684canvas\u5143\u7d20\uff0c\u5e76\u5c06\u5176\u8d4b\u503c\u7ed9\u53d8\u91cfcanvas\u3002\u7136\u540e\uff0c\u6211\u4eec\u4f7f\u7528getContext\u65b9\u6cd5\u83b7\u53d6\u4e86\u4e00\u4e2a\u7528\u4e8e\u7ed8\u56fe\u7684\u4e0a\u4e0b\u6587\u5bf9\u8c61\uff0c\u5e76\u5c06\u5176\u8d4b\u503c\u7ed9\u53d8\u91cfctx\u3002\u6700\u540e\uff0c\u6211\u4eec\u4f7f\u7528\u4e0a\u4e0b\u6587\u5bf9\u8c61\u7684fillStyle\u5c5e\u6027\u8bbe\u7f6e\u4e86\u586b\u5145\u989c\u8272\u4e3a\u7ea2\u8272\uff0c\u5e76\u4f7f\u7528fillRect\u65b9\u6cd5\u7ed8\u5236\u4e86\u4e00\u4e2a\u586b\u5145\u4e86\u7ea2\u8272\u7684\u77e9\u5f62\u3002<\/p>\n<h2 id=\"canvas%e5%85%83%e7%b4%a0%e7%9a%84%e5%b8%b8%e7%94%a8%e5%b1%9e%e6%80%a7%e5%92%8c%e6%96%b9%e6%b3%95-bbswINSZXj\">canvas\u5143\u7d20\u7684\u5e38\u7528\u5c5e\u6027\u548c\u65b9\u6cd5<\/h2>\n<p>canvas\u5143\u7d20\u6709\u8bb8\u591a\u5e38\u7528\u7684\u5c5e\u6027\u548c\u65b9\u6cd5\uff0c\u4e0b\u9762\u662f\u4e00\u4e9b\u5e38\u7528\u7684\u793a\u4f8b\uff1a<\/p>\n<ul>\n<li><strong>width<\/strong>\uff1a\u8bbe\u7f6e\u6216\u8fd4\u56decanvas\u5143\u7d20\u7684\u5bbd\u5ea6\u3002<\/li>\n<li><strong>height<\/strong>\uff1a\u8bbe\u7f6e\u6216\u8fd4\u56decanvas\u5143\u7d20\u7684\u9ad8\u5ea6\u3002<\/li>\n<li><strong>getContext()<\/strong>\uff1a\u8fd4\u56de\u4e00\u4e2a\u7528\u4e8e\u7ed8\u56fe\u7684\u4e0a\u4e0b\u6587\u5bf9\u8c61\u3002<\/li>\n<li><strong>fillStyle<\/strong>\uff1a\u8bbe\u7f6e\u6216\u8fd4\u56de\u7528\u4e8e\u586b\u5145\u56fe\u5f62\u7684\u989c\u8272\u3001\u6e10\u53d8\u6216\u6a21\u5f0f\u3002<\/li>\n<li><strong>fillRect()<\/strong>\uff1a\u7ed8\u5236\u4e00\u4e2a\u586b\u5145\u7684\u77e9\u5f62\u3002<\/li>\n<li><strong>strokeStyle<\/strong>\uff1a\u8bbe\u7f6e\u6216\u8fd4\u56de\u7528\u4e8e\u7ed8\u5236\u56fe\u5f62\u8f6e\u5ed3\u7684\u989c\u8272\u3001\u6e10\u53d8\u6216\u6a21\u5f0f\u3002<\/li>\n<li><strong>strokeRect()<\/strong>\uff1a\u7ed8\u5236\u4e00\u4e2a\u77e9\u5f62\u7684\u8f6e\u5ed3\u3002<\/li>\n<li><strong>clearRect()<\/strong>\uff1a\u5728\u7ed9\u5b9a\u7684\u77e9\u5f62\u5185\u6e05\u9664\u6307\u5b9a\u7684\u50cf\u7d20\u3002<\/li>\n<\/ul>\n<h2 id=\"canvas%e5%85%83%e7%b4%a0%e7%9a%84%e5%ba%94%e7%94%a8%e7%a4%ba%e4%be%8b-bbswINSZXj\">canvas\u5143\u7d20\u7684\u5e94\u7528\u793a\u4f8b<\/h2>\n<p>\u4e0b\u9762\u662f\u4e00\u4e2a\u4f7f\u7528canvas\u5143\u7d20\u7ed8\u5236\u7b80\u5355\u56fe\u5f62\u7684\u793a\u4f8b\uff1a<\/p>\n<pre><code>&lt;canvas id=\"myCanvas\" width=\"500\" height=\"300\"&gt;&lt;\/canvas&gt;\n\nvar canvas = document.getElementById(\"myCanvas\");\nvar ctx = canvas.getContext(\"2d\");\nctx.fillStyle = \"blue\";\nctx.fillRect(50, 50, 200, 100);\nctx.strokeStyle = \"red\";\nctx.strokeRect(100, 100, 200, 100);\nctx.clearRect(150, 150, 100, 50);\n<\/code><\/pre>\n<p>\u5728\u4e0a\u9762\u7684\u793a\u4f8b\u4e2d\uff0c\u6211\u4eec\u9996\u5148\u521b\u5efa\u4e86\u4e00\u4e2aid\u4e3a\"myCanvas\"\u7684canvas\u5143\u7d20\uff0c\u5e76\u6307\u5b9a\u4e86\u5b83\u7684\u5bbd\u5ea6\u4e3a500\u50cf\u7d20\uff0c\u9ad8\u5ea6\u4e3a300\u50cf\u7d20\u3002\u7136\u540e\uff0c\u6211\u4eec\u4f7f\u7528getContext\u65b9\u6cd5\u83b7\u53d6\u4e86\u4e00\u4e2a\u7528\u4e8e\u7ed8\u56fe\u7684\u4e0a\u4e0b\u6587\u5bf9\u8c61\uff0c\u5e76\u5c06\u5176\u8d4b\u503c\u7ed9\u53d8\u91cfctx\u3002\u63a5\u4e0b\u6765\uff0c\u6211\u4eec\u4f7f\u7528\u4e0a\u4e0b\u6587\u5bf9\u8c61\u7684fillStyle\u5c5e\u6027\u8bbe\u7f6e\u4e86\u586b\u5145\u989c\u8272\u4e3a\u84dd\u8272\uff0c\u5e76\u4f7f\u7528fillRect\u65b9\u6cd5\u7ed8\u5236\u4e86\u4e00\u4e2a\u586b\u5145\u4e86\u84dd\u8272\u7684\u77e9\u5f62\u3002\u7136\u540e\uff0c\u6211\u4eec\u4f7f\u7528\u4e0a\u4e0b\u6587\u5bf9\u8c61\u7684strokeStyle\u5c5e\u6027\u8bbe\u7f6e\u4e86\u7ed8\u5236\u8f6e\u5ed3\u7684\u989c\u8272\u4e3a\u7ea2\u8272\uff0c\u5e76\u4f7f\u7528strokeRect\u65b9\u6cd5\u7ed8\u5236\u4e86\u4e00\u4e2a\u5e26\u6709\u7ea2\u8272\u8f6e\u5ed3\u7684\u77e9\u5f62\u3002\u6700\u540e\uff0c\u6211\u4eec\u4f7f\u7528clearRect\u65b9\u6cd5\u5728\u6307\u5b9a\u7684\u77e9\u5f62\u5185\u6e05\u9664\u4e86\u4e00\u90e8\u5206\u50cf\u7d20\u3002<\/p>\n<h2 id=\"%e7%bb%93%e8%ae%ba-bbswINSZXj\">\u7ed3\u8bba<\/h2>\n<p>\u901a\u8fc7\u4f7f\u7528HTML\u7684canvas\u5143\u7d20\uff0c\u5f00\u53d1\u8005\u53ef\u4ee5\u5728\u7f51\u9875\u4e0a\u7ed8\u5236\u5404\u79cd\u56fe\u5f62\uff0c\u5b9e\u73b0\u4e30\u5bcc\u7684\u53ef\u89c6\u5316\u6548\u679c\u3002canvas\u5143\u7d20\u63d0\u4f9b\u4e86\u4e30\u5bcc\u7684\u5c5e\u6027\u548c\u65b9\u6cd5\uff0c\u4f7f\u5f00\u53d1\u8005\u53ef\u4ee5\u7075\u6d3b\u5730\u63a7\u5236\u7ed8\u56fe\u8fc7\u7a0b\u3002\u5e0c\u671b\u672c\u6587\u5bf9\u4f60\u7406\u89e3\u548c\u4f7f\u7528HTML\u7684canvas\u5143\u7d20\u6709\u6240\u5e2e\u52a9\u3002<\/p>\n<h2 id=\"%e9%a6%99%e6%b8%af%e6%9c%8d%e5%8a%a1%e5%99%a8%e9%a6%96%e9%80%89%e5%90%8e%e6%b5%aa%e4%ba%91-bbswINSZXj\">\u9999\u6e2f\u670d\u52a1\u5668\u9996\u9009\u540e\u6d6a\u4e91<\/h2>\n<p>\u540e\u6d6a\u4e91\u662f\u4e00\u5bb6\u4e13\u4e1a\u7684\u4e91\u8ba1\u7b97\u516c\u53f8\uff0c\u63d0\u4f9b\u9ad8\u6027\u80fd\u7684\u9999\u6e2f\u670d\u52a1\u5668\u3002\u65e0\u8bba\u60a8\u662f\u4e2a\u4eba\u7528\u6237\u8fd8\u662f\u4f01\u4e1a\u7528\u6237\uff0c\u540e\u6d6a\u4e91\u90fd\u80fd\u4e3a\u60a8\u63d0\u4f9b\u7a33\u5b9a\u53ef\u9760\u7684\u9999\u6e2f\u670d\u52a1\u5668\u89e3\u51b3\u65b9\u6848\u3002\u70b9\u51fb<a href=\"https:\/\/idc.net\">\u8fd9\u91cc<\/a>\u4e86\u89e3\u66f4\u591a\u5173\u4e8e\u540e\u6d6a\u4e91\u7684\u4fe1\u606f\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Html\u4ee3\u7801: canvas - \u753b\u5e03\u5143\u7d20 Html\u4ee3\u7801: canvas - \u753b\u5e03\u5143\u7d20 \u4ec0\u4e48\u662fHTML\u7684can [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[197854],"tags":[],"class_list":["post-238576","post","type-post","status-publish","format-standard","hentry","category-html"],"_links":{"self":[{"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/posts\/238576","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/comments?post=238576"}],"version-history":[{"count":0,"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/posts\/238576\/revisions"}],"wp:attachment":[{"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/media?parent=238576"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/categories?post=238576"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/tags?post=238576"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}