Array.prototype.push() - JavaScript | MDN
const animals = ["pigs", "goats", "sheep"]; const count = animals.push("cows"); console.log(count); // 予想ã•ã‚Œã‚‹çµæžœ: 4 console.log(animals); // 予想ã•ã‚Œã‚‹çµæžœ: Array ["pigs", "goats", "sheep", "cows"] animals.push("chickens", "cats", "dogs"); console.log(animals); // 予想ã•ã‚Œã‚‹çµæžœ: Array ["pigs", "goats", "sheep", "cows", "chickens", "cats", "dogs"]
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What's the difference between window.location and document.location?
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Trigger a button click with JavaScript on the Enter key in a text box
I have one text input and one button (see below). How can I use JavaScript to trigger the button's click event when the Enter key is pressed inside the text box? There is already a different submit button on my current page, so I can't simply make the button a submit button. And, I only want the Enter key to click this specific button if it is pressed from within this one text box, nothing else. <
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åäºŒç« ç¬¬ä¸‰å›žã€€History APIã“ã®ãƒšãƒ¼ã‚¸ã®æœ€çµ‚更新日：2018å¹´7月29æ—¥ 次ã«ç´¹ä»‹ã™ã‚‹ã®ãŒHTML5 History APIã§ã™ã€‚Historyã¨ã¯å±¥æ´ã®ã“ã¨ã§ã™ã€‚å±¥æ´é–¢ä¿‚ã®ã“ã¨ã¯ã€historyã¨ã„ã†åå‰ã®ã‚ªãƒ–ジェクトã‹ã‚‰åˆ©ç”¨å¯èƒ½ã§ã™ã€‚ å¤å…¸çš„ãªå±¥æ´æ“作実ã¯ã“ã®history自体ã¯æ˜”ã‹ã‚‰ã‚ã£ã¦ã€ã„ãã¤ã‹ãƒ¡ã‚½ãƒƒãƒ‰ã‚’æŒã£ã¦ã„ã¾ã—ãŸã€‚ history.back(); 例ãˆã°history.backメソッドã¯ã€ã„ã‚ゆるブラウザã®ã€Œæˆ»ã‚‹ã€ãƒœã‚¿ãƒ³ã¨åŒã˜å‹•ãã§ã™ã€‚ 実際ã«ã‚„ã£ã¦ã¿ã¾ã—ょã†ã€‚ ã“ã®ãƒœã‚¿ãƒ³ã¯æ¬¡ã®ã‚ˆã†ã«ã§ãã¦ã„ã¾ã™ã€‚ <input type="button" value="戻る" onclick="history.back()"> ã“ã®ãƒœã‚¿ãƒ³ã‚’押ã™ã¨ã€ãƒ–ラウザã®ã€Œæˆ»ã‚‹ã€ãƒœã‚¿ãƒ³ã‚’押ã—ãŸã¨ãã¨åŒã˜ã‚ˆã†ã«å‰ã®ãƒšãƒ¼ã‚¸ã«æˆ»ã‚Šã¾ã™ã€‚ 逆ã«ã€Œé€²ã‚€ã€ã¯history.forward()ã§ã™ã€‚ä»–ã«ã€ã€Œ
ã„ã‚„ãªãƒ–ãƒã‚° - æ–‡å—列æ“作ã®æ¯”較表: Ruby, Python, JavaScript, P...
æ–‡å—列æ“作ã®æ¯”較表: Ruby, Python, JavaScript, Perl, C++ Ruby, Python, JavaScript, Perl, C++ ã®æ–‡å—列æ“作ã®æ¯”較表を作りã¾ã—ãŸã€‚é…列æ“作ã®æ¯”較表ã®ç¶šç·¨ã§ã™ã€‚é–“é•ã„ãªã©ãŒã‚ã£ãŸã‚‰ã”指摘ã„ãŸã ã‘ã‚‹ã¨åŠ©ã‹ã‚Šã¾ã™ã€‚ Ruby (String) Python (str) JavaScript (String) Perl C++ (std::string)
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例ãˆã°ã€ã€Ž123456789ã€ã¨ã„ã†æ•°å€¤ã‚’ã€ã€Ž123,456,789ã€ã¨ã„ã†æ–‡å—列ã«ã—ãŸã„å ´åˆã€ã‚ˆãå–られる手法ã¨ã—ã¦ã¯ã€ä¸‹è¨˜ã®ã‚ˆã†ãªæ£è¦è¡¨ç¾ã‚„ループを使ã†æ–¹æ³•ãŒã‚ã‚Šã¾ã™ã€‚例ãˆã°ä¸‹è¨˜ã®ã‚ˆã†ãªæ„Ÿã˜(å‚考：JavaScriptã§æ•°å€¤ã‚’æ¡åŒºåˆ‡ã‚Š (カンマ区切り) ã«ã™ã‚‹æ–¹æ³•)。 var num = 123456789; String( num ).replace( /(\d)(?=(\d\d\d)+(?!\d))/g, '$1,' ); //=> "123,456,789" // 余談ã ã‘ã©ã€æ•°å€¤ã‚’æ–‡å—列ã«å¤‰æ›ã™ã‚‹éš›ã¯ã“ã‚“ãªæ›¸ã方もã§ãã‚‹ num.toString().replace( /(\d)(?=(\d\d\d)+(?!\d))/g, '$1,' ); //=> "123,456,789" (num+"").replace( /(\d)(?=(\d\d\d)+(?!\d))/g, '$1,
æ£è¦è¡¨ç¾ãƒªãƒ•ã‚¡ãƒ¬ãƒ³ã‚¹ - CoffeeScript
æ£è¦è¡¨ç¾ãƒªãƒ•ã‚¡ãƒ¬ãƒ³ã‚¹ï¼ˆCoffeeScript） æ£è¦è¡¨ç¾ã¯ãƒ‘ターンã¨ãƒ•ãƒ©ã‚°ã‚’/ã§åŒºåˆ‡ã£ã¦è¨˜è¿°ã—ã¾ã™ã€‚フラグã¯æŒ‡å®šã—ãªãã¦ã‚‚構ã„ã¾ã›ã‚“。 /パターン/フラグ フラグ フラグã«ã¯ä»¥ä¸‹ã®æ–‡å—ãŒæŒ‡å®šå¯èƒ½ã§ã™ã€‚ g 最åˆã®1個ã ã‘ã§ãªãã€æ–‡å—列ã®æœ€å¾Œã¾ã§æ¤œç´¢ã‚’ç¹°ã‚Šè¿”ã—ã¾ã™ã€‚「グãƒãƒ¼ãƒãƒ«ãƒžãƒƒãƒã€ã¨ã‚‚呼ã°ã‚Œã¾ã™ã€‚ æ–‡å—列.replaceメソッドã§gフラグを指定ã™ã‚‹ã¨ã€è¦‹ã¤ã‹ã£ãŸã™ã¹ã¦ã®éƒ¨åˆ†æ–‡å—列ãŒç½®æ›ã•ã‚Œã¾ã™ã€‚ # 最åˆã®aaã ã‘ãŒç½®æ›ã•ã‚Œã‚‹ "aabbaabb".replace(/aa/, "cc") # => 'ccbbaabb' # ã™ã¹ã¦ã®aaãŒç½®æ›ã•ã‚Œã‚‹ "aabbaabb".replace(/aa/g, "cc") # => 'ccbbccbb' i 大文å—å°æ–‡å—を区別ã›ãšã«ãƒžãƒƒãƒã—ã¾ã™ã€‚ # 大文å—ã®XYZã«ã®ã¿ãƒžãƒƒãƒã™ã‚‹ /XYZ/.test("xyz") # => false # 大
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数値をカンマ区切りã«ã™ã‚‹ - Qiita
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