{"id":1951,"date":"2021-08-22T09:21:30","date_gmt":"2021-08-22T00:21:30","guid":{"rendered":"https:\/\/suzutukiblog.com\/?p=1951"},"modified":"2023-01-06T01:31:27","modified_gmt":"2023-01-05T16:31:27","slug":"javascript2","status":"publish","type":"post","link":"https:\/\/suzutukiblog.com\/index.php\/2021\/08\/22\/javascript2\/","title":{"rendered":"JavaScript\u5b66\u7fd2\u306e\u307e\u3068\u30812(\u6bd4\u8f03\u6f14\u7b97\u5b50\uff64\u30a2\u30ed\u30fc\u95a2\u6570\uff64\u30b3\u30fc\u30eb\u30d0\u30c3\u30af\u95a2\u6570\uff64)"},"content":{"rendered":"

1:\u6bd4\u8f03\u6f14\u7b97\u5b50\u306b\u3064\u3044\u3066\u306e\u307e\u3068\u3081<\/h3>\n

HTML\u306e\u8a18\u8ff0<\/h3>\n
\n
<!DOCTYPE html>\r\n<html lang=\"en\">\r\n<head>\r\n  <meta charset=\"UTF-8\">\r\n  <meta name=\"viewport\" content=\"width=device-width, initial-scale=1.0\">\r\n  <meta http-equiv=\"X-UA-Compatible\" content=\"ie=edge\">\r\n<title>Document<\/title>\r\n<\/head>\r\n<body>\r\n  <h1>JavaScript\u306e\u57fa\u790e<\/h1>\r\n   <script src=\"main.js\"><\/script>\r\n<\/body>\r\n<\/html><\/code><\/pre>\n<\/div>\n
main.js\u306e\u8a18\u8ff0<\/h3>\n
\n
if(false) {\r\n  console.log('this is true');\r\n} else if(true) {\r\n  console.log('this is else if block');\r\n} else {\r\n  console.log('this is false');\r\n}\r\n\r\n\/\/ \u30c7\u30fc\u30bf\u306e\u578b\u3082\u4e00\u81f4\u3057\u3066\u306a\u3044\u3068\u30c0\u30e1\u3053\u306e\u5834\u5408false,==\u3060\u3068true\r\nif(1 === '1') {\r\n  console.log('this is true');\r\n} else {\r\n  console.log('this is false');\r\n}\r\n\r\n\/\/ \u3053\u306e\u5834\u5408true\u306b\u306a\u308b,false\u306f0,\u578b\u306e\u5909\u63db\u3092\u3059\u308b\r\nif(1 == true) {\r\n  console.log('this is true');\r\n} else {\r\n  console.log('this is false');\r\n}\r\n\r\n\/\/ =\u3067\u306a\u3044\u3053\u3068\u3092\u78ba\u8a8d\u3057\u305f\u3044\u3068\u304d\u3001\u578b\u306e\u6bd4\u8f03\u3082\u3059\u308b\u306e\u3067\r\nif(0 !== '0') {\r\n  console.log('this is true');\r\n} else {\r\n  console.log('this is false');\r\n}\r\n\r\n\/\/ \u6570\u5b57\u306b\u5909\u63db\u3057\u3066\u304b\u3089\u5024\u306e\u6bd4\u8f03\u3092\u884c\u3063\u3066\u53cd\u8ee2\r\nif(0 != '0' ) {\r\n  console.log('this is true');\r\n} else {\r\n  console.log('this is false');\r\n}\r\n\r\n\/\/ \u4e21\u65b9\u306e\u6761\u4ef6\u3092\u6e80\u305f\u3057\u3066\u3044\u306a\u3044\u306e\u3067false\r\nif(0 == '0' && 0 === '0') {\r\n  console.log('this is true');\r\n} else {\r\n  console.log('this is false');\r\n}\r\n\r\n\/\/ \u3069\u3061\u3089\u304b\u304ctrue\u306a\u3089true\u306b\u884c\u304f\r\nif(0 === '0' || 0 == '0') {\r\n  console.log('this is true');\r\n} else {\r\n  console.log('this is false');\r\n}\r\n\r\nconst num = null;\r\nconst bool = Boolean(num);\r\nconsole.log(bool);\r\n\r\nif(!num) {\r\n  console.log('this is true');\r\n} else {\r\n  console.log('this is false');\r\n}<\/code><\/pre>\n<\/div>\n
\u691c\u8a3c\u3057\u3066\u5b9f\u884c\u7d50\u679c\u3092\u78ba\u304b\u3081\u308b\u3068\u30fb\u30fb\u30fb<\/h3>\n
\"\"<\/p>\n
\u307e\u3068\u3081<\/h3>\n
\uff1d\uff1d\uff1d\u306f\u30c7\u30fc\u30bf\u306e\u578b\u3082\u4e00\u81f4\u3057\u3066\u306a\u3044\u3068\u30c0\u30e1\u3001\uff1d\uff1d\u306fOK<\/p>\n
!==\u306f\u578b\u306e\u6bd4\u8f03\u3092\u3059\u308b\u306e\u3067\u6ce8\u610f\u3001\uff01\uff1d\u306f\u6587\u5b57\u5217\u3092\u6570\u5b57\u306b\u5909\u63db\u3057\u3066\u304b\u3089\u6bd4\u8f03\u3057\u3066\u53cd\u8ee2\u3059\u308b<\/p>\n
&&\u306fand\u3068\u540c\u3058\u3067\u4e21\u65b9true\u3067\u306a\u3044\u3068\u304d\u306ffalse<\/p>\n
||\u306for\u3068\u540c\u3058\u3067\u4e21\u65b9false\u3067\u306a\u3044\u3068\u304d\u306ftrue<\/p>\n
false\u306f0,true\u306f\uff11<\/p>\n
\u6700\u5f8c\u306enull\u306ffalse\u3068\u540c\u3058(\u53b3\u5bc6\u306b\u306f\u9055\u3046)\u306a\u306e\u3067\u53cd\u8ee2\u3057\u3066true<\/p>\n
2: \u30a2\u30ed\u30fc\u95a2\u6570<\/h3>\n
\u30a2\u30ed\u30fc\u95a2\u6570\u3092\u4f7f\u3046\u3068\u7701\u7565\u3057\u305f\u8a18\u6cd5\u3067\u30b3\u30fc\u30c9\u3092\u8a18\u8ff0\u3067\u304d\u308b\u3002<\/p>\n
HTML\u306e\u8a18\u8ff0\u306f1\u3068\u540c\u3058\u306a\u306e\u3067\u7701\u7565<\/p>\n
main.js\u306e\u8a18\u8ff0<\/h3>\n
\n
\/\/ hello();\u3088\u308a\u4e0b\u306b\u79fb\u52d5\u3057\u3066\u3082\u30a8\u30e9\u30fc\u306b\u306a\u3089\u306a\u3044\r\n\/\/ function hello(name = 'Yan') {\r\n\/\/ console.log('hello ' + name);\r\n\/\/ }\r\n\r\n\/\/ hello();\u3088\u308a\u4e0b\u306b\u79fb\u52d5\u3059\u308b\u3068\u30a8\u30e9\u30fc\r\n\/\/ const hello = function(name = 'Yan') {\r\n\/\/ console.log('hello ' + name);\r\n\/\/ }\r\n\r\n\/\/ \/\/ \u30a2\u30ed\u30fc\u95a2\u6570\u306b\u3059\u308b\u30681\u884c\u3060\u3051\u306a\u3089{}\u3092\u9664\u3051\u308b\r\n\/\/ const hello = (name = 'Yan') => console.log('hello ' + name);\r\n\r\n\/\/ \/\/ \u5f15\u6570\u304c\u30c7\u30d5\u30a9\u30eb\u30c8\u5024\u306a\u3089\u3053\u3046\u3067\r\n\/\/ const hello = name => console.log('hello ' + name);\r\n\r\n\/\/ \/\/ \u5f15\u6570\u304c2\u3064\u306a\u3089\u3053\u306e\u3088\u3046\u306b\u8a18\u8ff0\r\n\/\/ const hello = (name, age) => console.log('hello ' + name + age);\r\n\r\n\/\/ \u623b\u308a\u5024\u3092\u51fa\u529b\u3059\u308b\u5834\u5408\u3001\u4e00\u822c\u7684\u8a18\u6cd5\r\n\/\/ const hello = (name, age) => {\r\n\/\/ return 40;\r\n\/\/ }\r\n\r\n\/\/ \u4e0a\u3068\u540c\u3058\u610f\u5473\u3060\u304c\u66f4\u306b\u7701\u7565\u3067\u304d\u308b\r\n\/\/ const hello = (name, age) => 40;\r\n\/\/ console.log(hello());\r\n\r\n\/\/ \u7701\u7565\u524d\u306e\u8a18\u6cd5\r\n\/\/ const retriever = (name, age) => 40;\r\n\/\/ const arry = [1,2,3,4,5,6];\r\n\/\/ arry.forEach(value => {\r\n\/\/ console.log(value);\r\n\/\/ })\r\n\r\n\/\/ \u7701\u7565\u5f8c\u306e\u30a2\u30ed\u30fc\u95a2\u6570\u306e\u8a18\u6cd5\r\n  const retriever = (name, age) => 40;\r\n\/\/ \u623b\u308a\u502440\u304c\u51fa\u529b\u3055\u308c\u308b\r\n  console.log(retriever());\r\n  const arry = [1,2,3,4,5,6];\r\n  arry.forEach(value => console.log(value));\r\n  const hello = (name, age) => console.log('hello ' + name + age);\r\n  hello('Tarou Tanaka ', 15);\r\n  hello('Tarou Tanaka2 ', 25);<\/code><\/pre>\n<\/div>\n
\r\n<\/strong>\u691c\u8a3c\u3057\u3066\u5b9f\u884c\u7d50\u679c\u3092\u78ba\u304b\u3081\u308b\u3068\u30fb\u30fb\u30fb<\/pre>\n
\"\"<\/p>\n
\u2191\u304c\u306a\u305c\u51fa\u529b\u3055\u308c\u305f\u304b\uff1f<\/p>\n
    \n
  1.  const retriever = (name, age) => 40; <\/strong>\u00a0console.log(retriever());\u3067=> 40\u306e\u90e8\u5206\u304c\u623b\u308a\u5024\u306a\u306e\u3067\u51fa\u529b\u3055\u308c\u305f<\/strong><\/li>\n
  2. \u914d\u5217\u3092\u30eb\u30fc\u30d7\u3057\u3066\u51fa\u529b\u3057\u305f\u304b\u3089<\/strong><\/li>\n
  3. ‘hello ‘ + \u4e0e\u3048\u305f\u5f15\u6570\u3067\u51fa\u529b\u3055\u308c\u305f<\/strong><\/li>\n
  4. ‘hello ‘ + \u4e0e\u3048\u305f\u5f15\u6570\u3067\u51fa\u529b\u3055\u308c\u305f<\/strong><\/li>\n<\/ol>\n
    3:\u30b3\u30fc\u30eb\u30d0\u30c3\u30af\u95a2\u6570\u306b\u3064\u3044\u3066<\/h3>\n
    HTML\u306e\u8a18\u8ff0\u306f1\u3068\u540c\u3058\u306a\u306e\u3067\u7701\u7565<\/p>\n
    main.js\u306e\u8a18\u8ff0<\/h3>\n
    \n
    \/\/ \u3044\u3064\u3082\u306e\u57fa\u672c\u7684\u306a\u66f8\u304d\u65b9\r\n\/\/ function hello(name) {\r\n\/\/ console.log(\"hello \" + name);\r\n\/\/ }\r\n\/\/ hello(\"Tanaka Tarou\");\r\n\r\n\/\/ callback\u306b\u95a2\u6570getname\u304c\u6e21\u308b(\u623b\u308a\u5024'Tanaka Tarou')\r\nfunction hello(callback, lastname) {\r\n\/\/ \u95a2\u6570\u3092\u5b9f\u884c\u3059\u308b\u305f\u3081callback()\u3068\u3057\u3066\u3044\u308b\r\n console.log('hello ' + callback());\r\n }\r\n\/\/ \u5f15\u6570\u306b\u6e21\u3059\u95a2\u6570\u3092callback\u95a2\u6570\u3068\u3044\u3046\r\n function getFirstName() {\r\n return 'Tanaka';\r\n}\r\n function getName() {\r\n return 'Tanaka\u3000Tarou';\r\n}\r\n\r\n hello(getFirstName);\r\n\/\/ \u95a2\u6570\u3092\u6e21\u3059\u3068\u623b\u308a\u5024'Tanaka Tarou'\u304c\u6e21\u308b\r\n hello(getName);\r\n\r\n\/\/ \u30b3\u30fc\u30eb\u30d0\u30c3\u30af\u306b\u5f15\u6570\u3092\u6e21\u3057\u305f\u3044\u5834\u5408\u3001lastname\u306bAkina\u304c\u6e21\u3063\u3066\u304f\u308b\r\nfunction hello2(callback, lastname) {\r\n\/\/ \u95a2\u6570\u3092\u5b9f\u884c\u3059\u308b\u305f\u3081callback()\u3068\u3057\u3066\u3044\u308b\r\n\/\/ callback(\u7b2c\u4e00\u5f15\u6570)\u306e\u4e2d\u8eab\u304c\u3053\u308c\r\nconsole.log(callback)\r\nconsole.log(lastname)\r\nconsole.log(callback(lastname))\r\nconsole.log(callback(callback))\r\nconsole.log('hello ' + callback(lastname));\r\n}\r\n\/\/ \u7121\u540d\u95a2\u6570\r\nhello2(function(name) {\r\nreturn 'suzutuki ' + name;\r\n}, 'Akina');\r\n\r\n\/\/ \u30a2\u30ed\u30fc\u95a2\u6570\u306e\u8a18\u6cd5\u306b\u76f4\u3059\u3068(function\u3068{}\u3068return\u3092\u7701\u7565)\r\n\/\/ hello(() => 'suzutuki');\r\n\r\nfunction doSomething(a, b, callback) {\r\n\/\/ \u7d50\u679c\u3092\u30b3\u30fc\u30eb\u30d0\u30c3\u30af\u95a2\u6570\u306b\u6e21\u3059\r\nconst result = callback(a, b);\r\nconsole.log(result);\r\n}\r\n\r\nfunction plus(a, b) {\r\nreturn a + b;\r\n}\r\nfunction multiply(a, b) {\r\nreturn a * b;\r\n}\r\n\/\/ \u51e6\u7406\u7d50\u679c\u3092\u5909\u3048\u308b\u3053\u3068\u304c\u3067\u304d\u308b\r\ndoSomething(2, 3, plus);\r\ndoSomething(2, 4, multiply);<\/code><\/pre>\n<\/div>\n
    \u691c\u8a3c\u3057\u3066\u5b9f\u884c\u7d50\u679c\u3092\u78ba\u304b\u3081\u308b\u3068\u30fb\u30fb\u30fb<\/h3>\n
    \"\"<\/p>\n
    \u2191\u304c\u306a\u305c\u51fa\u529b\u3055\u308c\u305f\u304b\uff1f<\/p>\n
      \n
    1. \u95a2\u6570getFirstName\u306e\u623b\u308a\u5024’Tanaka’\u304ccallback\u306b\u6e21\u3055\u308c\u308b\u306e\u3067hello Tanaka\u306b\u306a\u3063\u305f<\/li>\n
    2. \u95a2\u6570getName\u306e\u623b\u308a\u5024’Tanaka Tarou’\u304ccallback\u306b\u6e21\u3055\u308c\u308b\u306e\u3067hello Tanaka Tarou\u306b\u306a\u3063\u305f<\/li>\n
    3. \u7121\u540d\u95a2\u6570function(name) { return ‘suzutuki ‘ + name; }\u306e\u90e8\u5206\u304c\u7b2c\u4e00\u5f15\u6570\u306e\u4e2d\u306b\u5165\u3063\u3066\u3044\u308b\u305f\u3081\u3053\u306e\u3088\u3046\u306b\u51fa\u529b\u3055\u308c\u305f<\/strong><\/li>\n
    4. \u7121\u540d\u95a2\u6570’Akina’\u306e\u90e8\u5206\u304c\u7b2c\u4e8c\u5f15\u6570\u306a\u306e\u3067Akina\u304c\u51fa\u529b\u3055\u308c\u305f<\/li>\n
    5. \u7121\u540d\u95a2\u6570function(name) { return ‘suzutuki ‘ + name; }\u306e\u90e8\u5206\u306ename\u306e\u90e8\u5206\u306f\u7b2c\u4e8c\u5f15\u6570\u306eAkina\u304c\u683c\u7d0d\u3055\u308c\u3066\u3044\u308b\u306e\u3067Suzutuki Akina\u3068\u51fa\u529b\u3055\u308c\u305f\u3002<\/strong><\/li>\n
    6. \u7121\u540d\u95a2\u6570function(name) { return ‘suzutuki ‘ + name; }\u306e\u90e8\u5206\u306ename\u306e\u90e8\u5206\u306f\u7b2c\u4e00\u5f15\u6570\u306e\u95a2\u6570\u306e\u7121\u540d\u95a2\u6570function(name) { return ‘suzutuki ‘ + name; }\u304c\u683c\u7d0d\u3055\u308c\u3066\u3044\u308b\u306e\u3067Suzutuki \uff0b\u7121\u540d\u95a2\u6570function(name) { return ‘suzutuki ‘ + name; }\u3068\u51fa\u529b\u3055\u308c\u305f\u3002<\/strong><\/li>\n
    7. 5\u306b\u5358\u7d14\u306b’hello’\u304c\u8ffd\u52a0\u3055\u308c\u305f\u3060\u3051\u306a\u306e\u3067\u51fa\u529b\u3055\u308c\u305f\u3002<\/li>\n
    8. console.log(callback);\u306ecallback\u306e\u4e2d\u8eab\u306fcallback\u95a2\u6570\u306a\u306e\u3067function plus(a, b) { return a + b; } \u304c\u51fa\u529b\u3055\u308c\u305f\u3002<\/span><\/li>\n
    9. \u5909\u6570result\u306b\u306f\u7b2c\u4e09\u5f15\u6570\u306ecallback\u95a2\u6570 function plus(a, b) { return a + b; <\/span>}\u304c\u5165\u3063\u3066\u3044\u3066\u3001\u5f0f\u5c55\u958b\u304c\u884c\u308f\u308c\u305f\u7d50\u679c5\u304c\u51fa\u529b\u3055\u308c\u305f\u3002<\/span><\/li>\n
    10. console.log(callback);\u306ecallback\u306e\u4e2d\u8eab\u306fcallback\u95a2\u6570\u306a\u306e\u3067\n
      \n
      function multiply(a, b) { return a + b; } \u304c\u51fa\u529b\u3055\u308c\u305f\u3002<\/div>\n<\/div>\n<\/li>\n
    11. \u5909\u6570result\u306b\u306f\u7b2c\u4e09\u5f15\u6570\u306ecallback\u95a2\u6570 function multiply(a, b) { return a * b; <\/span>}\u304c\u5165\u3063\u3066\u3044\u3066\u3001\u5f0f\u5c55\u958b\u304c\u884c\u308f\u308c\u305f\u7d50\u679c8\u304c\u51fa\u529b\u3055\u308c\u305f\u3002<\/span><\/li>\n<\/ol>\n
      \u203b\u30dd\u30a4\u30f3\u30c8<\/h3>\n
      \n
      console.log()\u3067\u4e2d\u8eab\u3092\u78ba\u8a8d\u3059\u308b\u3068\u7406\u89e3\u3057\u3084\u3059\u3044\u306e\u3067\u3001\u7a4d\u6975\u7684\u306b\u4f7f\u304a\u3046\uff01<\/div>\n<\/div>\n
       <\/p>\n","protected":false},"excerpt":{"rendered":"
      1:\u6bd4\u8f03\u6f14\u7b97\u5b50\u306b\u3064\u3044\u3066\u306e\u307e\u3068\u3081 HTML\u306e\u8a18\u8ff0 <!DOCTYPE html> <html lang=”en”> <head> <meta charset=”UTF-8″> […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"footnotes":""},"categories":[17,27],"tags":[],"class_list":["post-1951","post","type-post","status-publish","format-standard","hentry","category-javascript","category-programming-note"],"aioseo_notices":[],"aioseo_head":"\n\t\t\n\t\n\t\n\t\n\t\n\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t