{"id":356,"date":"2020-07-25T10:46:00","date_gmt":"2020-07-25T01:46:00","guid":{"rendered":"https:\/\/blog.wsd.sh\/?p=356"},"modified":"2020-07-25T10:46:00","modified_gmt":"2020-07-25T01:46:00","slug":"11-12-javascript-%e5%a4%89%e6%9b%b4","status":"publish","type":"post","link":"https:\/\/blog.wsd.sh\/?p=356","title":{"rendered":"11->12 JavaScript \u5909\u66f4"},"content":{"rendered":"<p>root\u304b\u3089this\u306b\u5909\u66f4<br \/>\n1. canvas.js<br \/>\n1.1 \u30de\u30a6\u30b9\u62bc\u4e0b\u958b\u59cb\u3068\u30de\u30a6\u30b9\u62bc\u4e0b\u7d42\u4e86\u3092root\u304b\u3089this\u306b\u5909\u66f4<br \/>\nfunction(){&#8230;}.bind(this);\u3000\u3067function\u5185\u306ethis\u3092\u5f0f\u306e\u8a55\u4fa1\u6642\u306ethis\u306b\u56fa\u5b9a\u3059\u308b<\/p>\n<p>before:<\/p>\n<pre>\r\n                this.canvas.onmousedown = function(e){\r\n                        let root = window.root;\r\n                \/\/ \u30de\u30a6\u30b9\u62bc\u4e0b\u958b\u59cb\r\n                        root.drawStart(e.offsetX, e.offsetY, root.cnvBold, root.cnvColor);\r\n                        root.canvas.addEventListener(\"mousemove\" ,root.mouseMove, false);\r\n                }\r\n                this.canvas.onmouseup = function(){\r\n                        let root = window.root;\r\n                \/\/ \u30de\u30a6\u30b9\u62bc\u4e0b\u7d42\u4e86\r\n                        root.canvas.removeEventListener(\"mousemove\" , root.mouseMove, false);\r\n                }\r\n<\/pre>\n<p>after:<\/p>\n<pre>\r\n                this.canvas.onmousedown = function(e){\r\n                \/\/ \u30de\u30a6\u30b9\u62bc\u4e0b\u958b\u59cb\r\n                        this.drawStart(e.offsetX, e.offsetY, this.cnvBold, this.cnvColor);\r\n                        this.canvas.addEventListener(\"mousemove\" ,this.mouseMove, false);\r\n                }.bind(this);\r\n                this.canvas.onmouseup = function(){\r\n                \/\/ \u30de\u30a6\u30b9\u62bc\u4e0b\u7d42\u4e86\r\n                        this.canvas.removeEventListener(\"mousemove\" , this.mouseMove, false);\r\n                }.bind(this);\r\n<\/pre>\n<p>1.2 canvas\u4e0a\u3067\u306e\u30a4\u30d9\u30f3\u30c8\u3092root\u304b\u3089this\u306b\u5909\u66f4<br \/>\nfunction(){&#8230;}.bind(this);\u3000\u3067function\u5185\u306ethis\u3092\u5f0f\u306e\u8a55\u4fa1\u6642\u306ethis\u306b\u56fa\u5b9a\u3059\u308b<\/p>\n<p>before:<\/p>\n<pre>\r\n\r\n    \/\/ canvas\u4e0a\u3067\u306e\u30a4\u30d9\u30f3\u30c8\r\n        this.mouseMove = function (e){\r\n                let root = window.root;\r\n                \/\/console.log(this);\r\n                root.draw(e.offsetX, e.offsetY, root.cnvBold, root.cnvColor);\r\n        };\r\n<\/pre>\n<p>after:<\/p>\n<pre>\r\n\r\n    \/\/ canvas\u4e0a\u3067\u306e\u30a4\u30d9\u30f3\u30c8\r\n        this.mouseMove = function (e){\r\n                \/\/console.log(this);\r\n                this.draw(e.offsetX, e.offsetY, this.cnvBold, this.cnvColor);\r\n        }.bind(this);\r\n<\/pre>\n","protected":false},"excerpt":{"rendered":"<p>root\u304b\u3089this\u306b\u5909\u66f4 1. canvas.js 1.1 \u30de\u30a6\u30b9\u62bc\u4e0b\u958b\u59cb\u3068\u30de\u30a6\u30b9\u62bc\u4e0b\u7d42\u4e86\u3092root\u304b\u3089this\u306b\u5909\u66f4 function(){&#8230;}.bind(this);\u3000\u3067function\u5185\u306ethis\u3092\u5f0f&#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\/356"}],"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=356"}],"version-history":[{"count":1,"href":"https:\/\/blog.wsd.sh\/index.php?rest_route=\/wp\/v2\/posts\/356\/revisions"}],"predecessor-version":[{"id":357,"href":"https:\/\/blog.wsd.sh\/index.php?rest_route=\/wp\/v2\/posts\/356\/revisions\/357"}],"wp:attachment":[{"href":"https:\/\/blog.wsd.sh\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=356"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/blog.wsd.sh\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=356"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/blog.wsd.sh\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=356"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}