{"id":340,"date":"2020-07-25T10:40:46","date_gmt":"2020-07-25T01:40:46","guid":{"rendered":"https:\/\/blog.wsd.sh\/?p=340"},"modified":"2020-07-25T10:40:46","modified_gmt":"2020-07-25T01:40:46","slug":"04-05-javascript-%e5%a4%89%e6%9b%b4","status":"publish","type":"post","link":"https:\/\/blog.wsd.sh\/?p=340","title":{"rendered":"04->05 JavaScript \u5909\u66f4"},"content":{"rendered":"<p>1. canvas.js<br \/>\n1.1 event\u306e\u5909\u66f4<br \/>\nmousedown \u3068mouseup\u306e\u30a4\u30d9\u30f3\u30c8\u3092grab\u3059\u308b\u3053\u3068\u3067\u3001globalThis.clickFlg \u306e\u5fc5\u8981\u6027\u3092\u7121\u304f\u3059\u305f\u3081\u306e\u524d\u6e96\u5099\u3002<br \/>\nafter\u3067console.log(&#8220;mousemove&#8221;);\u306f\u901a\u904e\u3057\u306a\u304f\u306a\u308b\u3002<br \/>\n\u3053\u3053\u3067\u306f\u3001\u307e\u3060globalThis.clickFlg\u304c\u6b8b\u3063\u3066\u3044\u308b\u3002<\/p>\n<p>before:<\/p>\n<pre>\r\n       canvas.onmousemove = function(e){\r\n               if(!globalThis.clickFlg) {\r\n                       console.log(\"mousemove\");\r\n                       return false;\r\n               }\r\n               root.draw(e.offsetX, e.offsetY, cnvBold, cnvColor);\r\n       }\r\n<\/pre>\n<p>after:<\/p>\n<pre>\r\n       function _mouseMove(e){\r\n               if(!globalThis.clickFlg) {\r\n                       console.log(\"mousemove\");\r\n                       return false;\r\n               }\r\n               root.draw(e.offsetX, e.offsetY, cnvBold, cnvColor);\r\n       }\r\n        var canvas = document.getElementById(\"canvas\");\r\n        canvas.onmousedown = function(){\r\n                globalThis.clickFlg = 1; \/\/ \u30de\u30a6\u30b9\u62bc\u4e0b\u958b\u59cb\r\n                canvas.addEventListener(\"mousemove\" , _mouseMove, false);\r\n        }\r\n        canvas.onmouseup = function(){\r\n                globalThis.clickFlg = 0; \/\/ \u30de\u30a6\u30b9\u62bc\u4e0b\u7d42\u4e86\r\n                canvas.removeEventListener(\"mousemove\" , _mouseMove, false);\r\n        }\r\n\r\n<\/pre>\n","protected":false},"excerpt":{"rendered":"<p>1. canvas.js 1.1 event\u306e\u5909\u66f4 mousedown \u3068mouseup\u306e\u30a4\u30d9\u30f3\u30c8\u3092grab\u3059\u308b\u3053\u3068\u3067\u3001globalThis.clickFlg \u306e\u5fc5\u8981\u6027\u3092\u7121\u304f\u3059\u305f\u3081\u306e\u524d\u6e96\u5099\u3002 after\u3067console&#8230;.<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_mi_skip_tracking":false},"categories":[1],"tags":[],"_links":{"self":[{"href":"https:\/\/blog.wsd.sh\/index.php?rest_route=\/wp\/v2\/posts\/340"}],"collection":[{"href":"https:\/\/blog.wsd.sh\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/blog.wsd.sh\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/blog.wsd.sh\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/blog.wsd.sh\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=340"}],"version-history":[{"count":1,"href":"https:\/\/blog.wsd.sh\/index.php?rest_route=\/wp\/v2\/posts\/340\/revisions"}],"predecessor-version":[{"id":341,"href":"https:\/\/blog.wsd.sh\/index.php?rest_route=\/wp\/v2\/posts\/340\/revisions\/341"}],"wp:attachment":[{"href":"https:\/\/blog.wsd.sh\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=340"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/blog.wsd.sh\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=340"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/blog.wsd.sh\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=340"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}