[B! this] beth321ã®ãƒ–ãƒƒã‚¯ãƒžãƒ¼ã‚¯

beth321 id:beth321

thisã«é–¢ã™ã‚‹beth321ã®ãƒ–ãƒƒã‚¯ãƒžãƒ¼ã‚¯ (5)

${{author_name}}$

{{{comment_expanded}}}

{{label}}

{{#is_bookmark}}ãƒªã‚¹ãƒˆ{{/is_bookmark}}{{^is_bookmark}}ãƒªãƒ³ã‚¯{{/is_bookmark}}

${{author_name}}$
{{author_name}}{{created}}
{{ #comment }}{{ comment }}{{ /comment }}
- {{ label }}

${{author_name}}$

{{{comment_expanded}}}

{{label}}

{{#is_bookmark}}ãƒªã‚¹ãƒˆ{{/is_bookmark}}{{^is_bookmark}}ãƒªãƒ³ã‚¯{{/is_bookmark}}

JavaScript ã® this ã‚’ç†è§£ã™ã‚‹ - tacamy--blog
this ã¯ã‚¤ãƒ³ã‚¹ã‚¿ãƒ³ã‚¹è‡ªèº«ã‚’æŒ‡ã™ã€ãŸã ãã‚Œã ã‘ã®è©±ã§ã—ã‚‡ã†ï¼Ÿ ãã‚“ãªãµã†ã«è€ƒãˆã¦ã„ãŸæ™‚æœŸãŒç§ã«ã‚‚ã‚ã‚Šã¾ã—ãŸã€‚ãã†ã€JavaScript ã® this ã«å‡ºä¼šã†ã¾ã§ã¯ãƒ»ãƒ»ã€‚ ç”¨èªžã«ã¤ã„ã¦ ç§ã¯ Java è„³ã§æ›¸ã„ã¦ã‚‹ã®ã§ã€è¨€è‘‰é£ã„ãŒ JavaScript ã¨è‹¥å¹²é•ã†éƒ¨åˆ†ãŒã‚ã‚‹ã¨æ€ã„ã¾ã™ã€‚ ä¸‹è¨˜ã®ã‚ˆã†ãªã‚¤ãƒ¡ãƒ¼ã‚¸ã§è¨€è‘‰ã‚’ä½¿ã£ã¦ã„ã¾ã™ã€‚ ç”¨èªž æ„å‘³ ã‚¯ãƒ©ã‚¹ ã‚¤ãƒ³ã‚¹ã‚¿ãƒ³ã‚¹ã‚ªãƒ–ã‚¸ã‚§ã‚¯ãƒˆã®å…ƒã¨ãªã‚‹è¨è¨ˆå›³ ã‚³ãƒ³ã‚¹ãƒˆãƒ©ã‚¯ã‚¿ ã‚¯ãƒ©ã‚¹ã®ã‚³ãƒ¼ãƒ‰éƒ¨åˆ†ã§ã€new ã—ãŸã¨ãã«ã‚³ãƒ³ã‚¹ãƒˆãƒ©ã‚¯ã‚¿ã®å†…å®¹ã§åˆæœŸåŒ–ã™ã‚‹ ã‚¤ãƒ³ã‚¹ã‚¿ãƒ³ã‚¹ ã‚¯ãƒ©ã‚¹ã‚’å…ƒã«å®Ÿä½“åŒ–ã—ãŸã‚ªãƒ–ã‚¸ã‚§ã‚¯ãƒˆ ãƒ¡ãƒ³ãƒå¤‰æ•° ã‚¯ãƒ©ã‚¹ã‚„ã‚¤ãƒ³ã‚¹ã‚¿ãƒ³ã‚¹ã«å±žã™ã‚‹ãƒãƒ¼ã‚«ãƒ«å¤‰æ•° ãƒ¡ã‚½ãƒƒãƒ‰ ã‚¯ãƒ©ã‚¹ã‚„ã‚¤ãƒ³ã‚¹ã‚¿ãƒ³ã‚¹ã«å±žã™ã‚‹å‘½ä»¤ï¼ˆé–¢æ•°ï¼‰ ã‚ªãƒ–ã‚¸ã‚§ã‚¯ãƒˆæŒ‡å‘ã¨ãƒ—ãƒãƒˆã‚¿ã‚¤ãƒ—ã¨ this JavaScript ã®ã‚ªãƒ–ã‚¸ã‚§ã‚¯ãƒˆæŒ‡å‘é–‹ç™ºã§ã¯ã€å…ƒã«ãªã‚‹ã‚¯ãƒ©ã‚¹ã‚’ new ã™ã‚‹ã“ã¨ã§ã€ã‚¤ãƒ³ã‚¹ã‚¿ãƒ³ã‚¹ã‚’ç”Ÿæˆã—ã¾ã™ã€‚
beth321 2015/03/30
()

javascript

lerning

this

ã‚ã¨ã§èªã‚€

programming

åŸºæœ¬

è¨€èªžä»•æ§˜

tips

js-this
ãƒªãƒ³ã‚¯
ç¬¬16å›žã€€JavaScriptã®thisã¨call | gihyo.jp
ã“ã‚“ã«ã¡ã¯ã€å¤ªç”°ã§ã™ã€‚å‰ã€…å›žã€å‰å›žã¨JavaScriptã«ãŠã‘ã‚‹ç¶™æ‰¿ã«ã¤ã„ã¦å¦ç¿’ã—ã¾ã—ãŸã€‚ä»Šå›žã¯ãã‚Œã«æ·±ãé–¢ã‚ã‚‹thisã«ã¤ã„ã¦å¦ã‚“ã§ã„ãã¾ã™ã€‚ JavaScriptã®thisã¯ã‚„ã‚„ã‚¯ã‚»ã®ã‚ã‚‹å‹•ä½œã‚’ã™ã‚‹ã‚ˆã†ã«æ€ãˆã‚‹ã‹ã‚‚ã—ã‚Œã¾ã›ã‚“ãŒã€ä»•çµ„ã¿ã‚’ã—ã£ã‹ã‚ŠæŠŠæ¡ã™ã‚Œã°å®Ÿã«ç°¡å˜ã§ã™ã€‚ç‰¹ã«é‡è¦ãªã®ã¯æ¬¡ã®2ç‚¹ã§ã™ã€‚ thisãŒä½•ã‚’æŒ‡ã™ã‹ã¯é–¢æ•°ã®å‘¼ã³å‡ºã—æ–¹ã§æ±ºå®šã™ã‚‹ thisã¯é–¢æ•°ã‚¹ã‚³ãƒ¼ãƒ—ã«å˜åœ¨ã™ã‚‹ç‰¹æ®Šãªå¤‰æ•°ã§ã‚ã‚‹ ã‚¤ãƒ³ã‚¹ã‚¿ãƒ³ã‚¹ã¨ã—ã¦ã®this ã§ã¯ã€ã¾ãšã¯ã‚³ãƒ³ã‚¹ãƒˆãƒ©ã‚¯ã‚¿å†…ã§ã®ã‚¤ãƒ³ã‚¹ã‚¿ãƒ³ã‚¹ã¨ã—ã¦ã®thisã‚’è¦‹ã¦ã¿ã¾ã—ã‚‡ã†ã€‚ ã‚³ãƒ³ã‚¹ãƒˆãƒ©ã‚¯ã‚¿ã¨this function A(name){ this.name = name; } A.prototype.getThis=function(){ return this; }; var a = new A('aaa'); console.log(a); console
beth321 2014/10/12
()

js

prototype

javascript

call

programming

this

ã‚ã¨ã§èªã‚€

ã‚¯ãƒã‚¹ãƒ–ãƒ©ã‚¦ã‚¶

ãƒ—ãƒã‚°ãƒ©ãƒŸãƒ³ã‚°
ãƒªãƒ³ã‚¯
ã™ã¹ã¦ã®åä¾›ã«è´ã‹ã›ã‚‹ã¹ãã§ãªã„ã‚¢ãƒ«ãƒãƒ 10é¸ - ã‚ã–ãªãˆã‚‹ãªã‚ã®ã”ã¨ã—
ã€Œå…¨ã¦ã®åä¾›ãŒ13æ³ã«ãªã‚‹ã¾ã§ã«è´ã„ã¦ãŠãã¹ãã‚¢ãƒ«ãƒãƒ 33é¸ã€ã‚’ç±³ã‚µã‚¤ãƒˆBuzzfeedãŒç™ºè¡¨ - amass è´ã‹ã›ã¦ã„ã£ãŸã„ã©ã‚“ãªåä¾›ã«ã—ãŸã„ã®ã§ã—ã‚‡ã†ã‹â€¦â€¦ã€‚ ãƒãƒƒã‚¯ãªã‚“ã¦ã‚¯ã‚ºéŸ³æ¥½ã§ã™*1ã€‚ åä¾›ã«è´ã‹ã›ã‚‹ã¹ãã§ã¯ã‚ã‚Šã¾ã›ã‚“ã€‚ ãã†æ˜”ã‹ã‚‰è¨€ã‚ã‚Œç¶šã‘ã¦ãã¾ã—ãŸã€‚ ãã“ã§ã€Œåä¾›ã«è´ã‹ã›ã‚‹ã®ã¯æ•™è‚²ä¸Šã‚ˆããªã„ã‚¢ãƒ«ãƒãƒ ã€ã‚’è€ƒãˆã¦ã¿ã¾ã—ãŸã€‚ 1.THE BLUE HEARTS/ã‚¶ï½¥ãƒ–ãƒ«ãƒ¼ãƒãƒ¼ãƒ„ åä¾›ã«è´ã‹ã›ã‚‹ã¨ ã€Œãƒ‰ã‚¢ã‚’é–‹ã‘ã¦ãã“ã‹ã‚‰é ãã‚’çœºã‚ã¦ã‚‹ã ã‘ã˜ã‚ƒãƒ€ãƒ¡ã ã€‚ãƒŠã‚¤ãƒ•ã‚’æŒã¨ã†ã€ ã¨æ€ã£ã¦ã—ã¾ã„ã¾ã™ã€‚ ãƒ‘ãƒ³ã‚¯ã‚’è´ã‹ã›ã‚‹ã®ã¯ã‚„ã‚ã¾ã—ã‚‡ã†ã€‚ THE BLUE HEARTS äººã«ã‚„ã•ã—ã(Be Nice) - YouTube 2.å‹ã ã¡ã‚’æ®ºã—ã¦ã¾ã§/ç¥žè–ã‹ã¾ã£ã¦ã¡ã‚ƒã‚“ ã‚¿ã‚¤ãƒˆãƒ«ãŒã€ã‚¿ã‚¤ãƒ ãƒªãƒ¼ã™ãŽã¾ã™ã€‚ ã€Œãƒœã‚¯ã¯æ—©ãæ»ã«ãŸã„ã€ãªã‚“ã¦è¨€ã†æŒè©žã‚’èžã‹ã›ã¦ã¯ã„ã‘ã¾ã›ã‚“ 3.å®¶åºæ•™å¸«/å²¡æ‘é–å¹¸ åä¾›ã«ã¯ã€åˆºæ¿€
beth321 2014/08/06
éŸ³æ¥½

*1

music

ãƒã‚¿

åä¾›

ã‚¤ãƒ³ã‚¿ãƒ¬ã‚¹ãƒˆ

â€¦â€¦

IT

ãƒ›ãƒƒãƒˆã‚¨ãƒ³ãƒˆãƒª

This
ãƒªãƒ³ã‚¯
JavaScript ã® this ã‚ãƒ¼ãƒ¯ãƒ¼ãƒ‰ã«çµã³ã¤ã‘ã‚‰ã‚Œã‚‹å€¤ã¯ã©ã®ã‚ˆã†ã«æ±ºå®šã•ã‚Œã‚‹ã®ã‹ (è¨€èªžä»•æ§˜ã®èª¬æ˜Ž) - ã²ã ã¾ã‚Šã‚½ã‚±ãƒƒãƒˆã¯å£Šã‚Œãªã„
æœ€è¿‘ JavaScript ã® this ã‚ãƒ¼ãƒ¯ãƒ¼ãƒ‰ã«ã¤ã„ã¦ã®è¨˜äº‹ã‚’ã„ãã¤ã‹è¦‹ã‹ã‘ã¦ ã€Œãã†ã„ã‚„è‡ªåˆ†ã‚‚æ˜” this ã‚ãƒ¼ãƒ¯ãƒ¼ãƒ‰ã«ã¤ã„ã¦è¨˜äº‹ã‚’æ›¸ã„ãŸãªãƒ¼ã€ ã¨æ€ã£ã¦ å¤ã„è¨˜äº‹ ã‚’è¦‹è¿”ã—ã¦ã¿ãŸã®ã§ã™ãŒã€é–¢æ•°å‘¼ã³å‡ºã—ã®ã“ã¨ã—ã‹èª¬æ˜Žã—ã¦ãªã‹ã£ãŸã®ã§æ”¹ã‚ã¦ this ã‚ãƒ¼ãƒ¯ãƒ¼ãƒ‰ã®å…¨èˆ¬çš„ãªè©±ã‚’æ›¸ã„ã¦ãŠã“ã†ã‹ã¨æ€ã„ã¾ã™ã€‚ æœ¬è¨˜äº‹ã¯ ECMA-262 5.1th ã«åŸºã¥ã„ã¦ã„ã¾ã™ã€‚ åˆå¿ƒè€…å‘ã‘ã® this ã‚ãƒ¼ãƒ¯ãƒ¼ãƒ‰ã®ä½¿ã„æ–¹ã®æŒ‡é‡ã‚’ç¤ºã—ã¦ã„ã‚‹ã‚ã‘ã§ã‚‚ JavaScript å‡¦ç†ç³»ã®å®Ÿè£…ã®èª¬æ˜Žã‚’ã—ã¦ã„ã‚‹ã‚ã‘ã§ã‚‚ãªãã€JavaScript è¨€èªžã‚³ã‚¢ã®ä»•æ§˜ã‚’èª¬æ˜Žã—ã¦ã„ã‚‹ã“ã¨ã«æ³¨æ„ã—ã¦ãã ã•ã„ã€‚ ECMA-262 5.1th : JavaScript ã®è¨€èªžã‚³ã‚¢éƒ¨åˆ† (ECMAScript) ã®è¨€èªžä»•æ§˜ (ãƒãƒ¼ã‚¸ãƒ§ãƒ³ 5.1) åˆå¿ƒè€…å‘ã‘ã® this ã‚ãƒ¼ãƒ¯ãƒ¼ãƒ‰å‘¨ã‚Šã®æŒ‡é‡ ã“ã®è¨˜äº‹ã®æœ€å¾Œã® ã€Œã¾ã¨ã‚ã€ ã«ã€è‡ªåˆ†ãŒ
beth321 2013/02/03
*ã‚ã¨ã§èªã‚€

*Javascript

javascript

programming

this

ãƒ—ãƒã‚°ãƒ©ãƒŸãƒ³ã‚°

ECMAScript

ä»•æ§˜

ã‚ã¨ã§ã¿ã‚‹

MyInterest
ãƒªãƒ³ã‚¯
JavaScriptã®thisã®è¦šãˆæ–¹ - Qiita
JavaScriptã®thisã¯åŒã˜ã‚½ãƒ¼ã‚¹ã‚³ãƒ¼ãƒ‰ã§ã‚‚å‘¼ã³å‡ºã—å…ƒæ¬¡ç¬¬ã§æ„å‘³ãŒé•ã£ãŸã‚Šã—ã¦è¤‡é›‘ã ã¨æ€ã‚ã‚ŒãŒã¡ã ã‘ã©ã€ä¸€å›žè¦šãˆã¦ã—ã¾ãˆã°ç°¡å˜ã ã€‚ JavaScriptã«ã¯thisãŒ4ç¨®é¡žã‚ã‚‹ ã“ã‚Œã ã‘ã‚’ã—ã£ã‹ã‚Šè¦šãˆã¦ãŠã‘ã°ã€å¾Œã¯å¿…è¦ãªæ™‚ã« 4ç¨®é¡žã£ã¦ä½•ãŒã‚ã‚‹ã‚“ã ã£ã‘ï¼Ÿ ã¨è€ƒãˆã‚Œã°å®¹æ˜“ã«æ€ã„å‡ºã›ã‚‹ã€‚ ã¡ãªã¿ã«ã€ä¸‹è¨˜ã®ã‚³ãƒ¼ãƒ‰ã¯ãƒ–ãƒ©ã‚¦ã‚¶ä¸Šã§å®Ÿè¡Œã™ã‚‹ã“ã¨ã‚’æƒ³å®šã—ã¦ã„ã‚‹ã€‚(ãªã®ã§windowã‚’ä½¿ã†) ãƒˆãƒƒãƒ—ãƒ¬ãƒ™ãƒ«ã®this ã‚°ãƒãƒ¼ãƒãƒ«ã‚ªãƒ–ã‚¸ã‚§ã‚¯ãƒˆã‚’æŒ‡ã™ã€‚ var hoge = "fuga"; window.foo = "bar"; // fuga+bar ã¨è¡¨ç¤ºã•ã‚Œã‚‹ console.log(this.hoge + "+" + this.foo); (function(){ // åŒã˜ãfuga+bar ã¨è¡¨ç¤ºã•ã‚Œã‚‹ console.log(this.hoge + "+" + this.foo); })(
beth321 2013/02/01
()

*tips

javascript

this

ãƒ—ãƒã‚°ãƒ©ãƒŸãƒ³ã‚°

Programming

tips

js

é–‹ç™ºè€…å‘ã‘

ã‚ã¨ã§èªã‚€
ãƒªãƒ³ã‚¯
1