{"id":3395,"date":"2024-11-10T17:17:28","date_gmt":"2024-11-10T09:17:28","guid":{"rendered":"https:\/\/fwq.ai\/blog\/3395\/"},"modified":"2024-11-10T17:17:28","modified_gmt":"2024-11-10T09:17:28","slug":"js%e5%a6%82%e4%bd%95%e7%94%bb%e6%ad%a3%e4%b8%89%e8%a7%92%e5%bd%a2","status":"publish","type":"post","link":"https:\/\/fwq.ai\/blog\/3395\/","title":{"rendered":"js\u5982\u4f55\u753b\u6b63\u4e09\u89d2\u5f62"},"content":{"rendered":"<blockquote><p>\n  \u53ef\u4ee5\u4f7f\u7528 canvas api \u5728 javascript \u4e2d\u7ed8\u5236\u6b63\u4e09\u89d2\u5f62\u3002\u6b65\u9aa4\u5982\u4e0b\uff1a\u521b\u5efa\u753b\u5e03\u5e76\u8bbe\u7f6e\u5927\u5c0f\u3002\u8bbe\u7f6e\u4e09\u89d2\u5f62\u8fb9\u957f\u548c\u4e2d\u5fc3\u70b9\u5750\u6807\u3002\u4f7f\u7528beginpath()\u3001moveto()\u3001lineto()\u548cclosepath()\u65b9\u6cd5\u7ed8\u5236\u4e09\u89d2\u5f62\u3002\u4f7f\u7528fillstyle\u548cfill()\u65b9\u6cd5\u586b\u5145\u4e09\u89d2\u5f62\u3002\n<\/p><\/blockquote>\n<p><img decoding=\"async\" src=\"https:\/\/img.php.cn\/upload\/article\/202411\/08\/2024110811282795826.jpg\" class=\"aligncenter\" title=\"js\u5982\u4f55\u753b\u6b63\u4e09\u89d2\u5f62\u63d2\u56fe\" alt=\"js\u5982\u4f55\u753b\u6b63\u4e09\u89d2\u5f62\u63d2\u56fe\" \/><\/p>\n<p><strong>\u5728 JavaScript \u4e2d\u7ed8\u5236\u6b63\u4e09\u89d2\u5f62<\/strong><\/p>\n<p><strong>\u5982\u4f55\u4f7f\u7528 JavaScript \u7ed8\u5236\u6b63\u4e09\u89d2\u5f62\uff1f<\/strong><\/p>\n<p>\u53ef\u4ee5\u4f7f\u7528 Canvas API \u5728 JavaScript \u4e2d\u7ed8\u5236\u6b63\u4e09\u89d2\u5f62\u3002\u4ee5\u4e0b\u6b65\u9aa4\u8bf4\u660e\u4e86\u5982\u4f55\u6267\u884c\u6b64\u64cd\u4f5c\uff1a<\/p>\n<p><strong>\u6b65\u9aa4 1\uff1a\u521b\u5efa\u753b\u5e03<\/strong><\/p>\n<pre>const canvas = document.getElementById(\"myCanvas\");\nconst ctx = canvas.getContext(\"2d\");\n\n\/\/ \u8bbe\u7f6e\u753b\u5e03\u5927\u5c0f\ncanvas.width = 500;\ncanvas.height = 500;<\/pre>\n<p>  \u767b\u5f55\u540e\u590d\u5236   <\/p>\n<p><strong>\u6b65\u9aa4 2\uff1a\u8bbe\u7f6e\u4e09\u89d2\u5f62\u5c5e\u6027<\/strong><\/p>\n<pre>\/\/ \u4e09\u89d2\u5f62\u7684\u4e09\u6761\u8fb9\u957f\nconst sideLength = 100;\n\n\/\/ \u4e09\u89d2\u5f62\u4e2d\u5fc3\u70b9\u5750\u6807\nconst centerX = canvas.width \/ 2;\nconst centerY = canvas.height \/ 2;<\/pre>\n<p>  \u767b\u5f55\u540e\u590d\u5236   <\/p>\n<p><strong>\u6b65\u9aa4 3\uff1a\u7ed8\u5236\u4e09\u89d2\u5f62<\/strong><\/p>\n<pre>ctx.beginPath();\nctx.moveTo(centerX, centerY - sideLength \/ 2); \/\/ \u79fb\u52a8\u5230\u9876\u70b9\nctx.lineTo(centerX + sideLength \/ 2, centerY + sideLength \/ 2); \/\/ \u753b\u4e00\u6761\u8fb9\u5230\u53f3\u4e0b\u89d2\nctx.lineTo(centerX - sideLength \/ 2, centerY + sideLength \/ 2); \/\/ \u753b\u4e00\u6761\u8fb9\u5230\u5de6\u4e0b\u89d2\nctx.closePath(); \/\/ \u5173\u95ed\u8def\u5f84\u56de\u5230\u9876\u70b9<\/pre>\n<p>  \u767b\u5f55\u540e\u590d\u5236   <\/p>\n<p><strong>\u6b65\u9aa4 4\uff1a\u586b\u5145\u4e09\u89d2\u5f62<\/strong><\/p>\n<p>\u8981\u586b\u5145\u4e09\u89d2\u5f62\uff0c\u8bf7\u4f7f\u7528\u4ee5\u4e0b\u4ee3\u7801\uff1a<\/p>\n<pre>ctx.fillStyle = \"red\"; \/\/ \u8bbe\u7f6e\u586b\u5145\u989c\u8272\nctx.fill(); \/\/ \u586b\u5145\u4e09\u89d2\u5f62<\/pre>\n<p>  \u767b\u5f55\u540e\u590d\u5236   <\/p>\n<p>\u4ee5\u4e0a\u5c31\u662fjs\u5982\u4f55\u753b\u6b63\u4e09\u89d2\u5f62\u7684\u8be6\u7ec6\u5185\u5bb9\uff0c\u66f4\u591a\u8bf7\u5173\u6ce8\u7c73\u4e91\u5176\u5b83\u76f8\u5173\u6587\u7ae0\uff01<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u53ef\u4ee5\u4f7f\u7528 canvas api \u5728 javascript \u4e2d\u7ed8\u5236\u6b63\u4e09\u89d2\u5f62\u3002\u6b65\u9aa4\u5982\u4e0b\uff1a\u521b\u5efa\u753b\u5e03\u5e76\u8bbe\u7f6e\u5927\u5c0f\u3002\u8bbe\u7f6e\u4e09\u89d2\u5f62\u8fb9\u957f\u548c\u4e2d\u5fc3\u70b9\u5750\u6807\u3002\u4f7f\u7528beginpath()\u3001moveto()\u3001lineto()\u548cclosepath()\u65b9\u6cd5\u7ed8\u5236\u4e09\u89d2\u5f62\u3002\u4f7f\u7528fillstyle\u548cfill()\u65b9\u6cd5\u586b\u5145\u4e09\u89d2\u5f62\u3002 \u5728 JavaScript \u4e2d\u7ed8\u5236\u6b63\u4e09\u89d2\u5f62 \u5982\u4f55\u4f7f\u7528 JavaScript \u7ed8\u5236\u6b63\u4e09\u89d2\u5f62\uff1f \u53ef\u4ee5\u4f7f\u7528 Canvas API \u5728 JavaScript \u4e2d\u7ed8\u5236\u6b63\u4e09\u89d2\u5f62\u3002\u4ee5\u4e0b\u6b65\u9aa4\u8bf4\u660e\u4e86\u5982\u4f55\u6267\u884c\u6b64\u64cd\u4f5c\uff1a \u6b65\u9aa4 1\uff1a\u521b\u5efa\u753b\u5e03 const canvas = document.getElementById(&#8220;myCanvas&#8221;); const ctx = canvas.getContext(&#8220;2d&#8221;); \/\/ \u8bbe\u7f6e\u753b\u5e03\u5927\u5c0f canvas.width = 500; canvas.height = 500; \u767b\u5f55\u540e\u590d\u5236 \u6b65\u9aa4 2\uff1a\u8bbe\u7f6e\u4e09\u89d2\u5f62\u5c5e\u6027 \/\/ \u4e09\u89d2\u5f62\u7684\u4e09\u6761\u8fb9\u957f const sideLength = 100; \/\/ \u4e09\u89d2\u5f62\u4e2d\u5fc3\u70b9\u5750\u6807 const centerX = canvas.width \/ 2; const centerY [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[16],"tags":[],"class_list":["post-3395","post","type-post","status-publish","format-standard","hentry","category-16"],"_links":{"self":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/3395","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/comments?post=3395"}],"version-history":[{"count":0,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/3395\/revisions"}],"wp:attachment":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/media?parent=3395"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/categories?post=3395"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/tags?post=3395"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}