{"id":25954,"date":"2024-10-27T06:48:43","date_gmt":"2024-10-27T06:48:43","guid":{"rendered":"http:\/\/atmokpo.com\/w\/?p=25954"},"modified":"2024-11-26T07:49:10","modified_gmt":"2024-11-26T07:49:10","slug":"%eb%a6%ac%ec%95%a1%ed%8a%b8-%ea%b0%95%ec%a2%8c-%ec%9d%b4%eb%b2%a4%ed%8a%b8-%ec%b2%98%eb%a6%ac%ed%95%98%ea%b8%b0","status":"publish","type":"post","link":"https:\/\/atmokpo.com\/w\/25954\/","title":{"rendered":"\ub9ac\uc561\ud2b8 \uac15\uc88c: \uc774\ubca4\ud2b8 \ucc98\ub9ac\ud558\uae30"},"content":{"rendered":"<p>\ub9ac\uc561\ud2b8\ub294 \uc0ac\uc6a9\uc790 \uc778\ud130\ud398\uc774\uc2a4\ub97c \uad6c\ucd95\ud558\uae30 \uc704\ud55c \ub9e4\uc6b0 \uc720\uc6a9\ud55c \ub77c\uc774\ube0c\ub7ec\ub9ac\uc785\ub2c8\ub2e4. \uc774\ubca4\ud2b8 \ucc98\ub9ac(event handling)\ub294 \ub9ac\uc561\ud2b8 \uc560\ud50c\ub9ac\ucf00\uc774\uc158\uc5d0\uc11c \uc0ac\uc6a9\uc790 \uc785\ub825\uc744 \ucc98\ub9ac\ud558\ub294 \ub370 \ud544\uc218\uc801\uc785\ub2c8\ub2e4. \uc774 \uac15\uc88c\uc5d0\uc11c\ub294 \ub9ac\uc561\ud2b8\uc5d0\uc11c \uc774\ubca4\ud2b8\ub97c \ucc98\ub9ac\ud558\ub294 \ubc29\ubc95\uc5d0 \ub300\ud574 \uae4a\uc774 \uc788\uac8c \uc54c\uc544\ubcf4\uaca0\uc2b5\ub2c8\ub2e4.<\/p>\n<h2>1. \uc774\ubca4\ud2b8\ub780?<\/h2>\n<p>\uc774\ubca4\ud2b8\ub294 \ube0c\ub77c\uc6b0\uc800\uc5d0\uc11c \ubc1c\uc0dd\ud558\ub294 \ud2b9\uc815 \ub3d9\uc791 \ub610\ub294 \uc0c1\ud0dc \ubcc0\ud654\uc785\ub2c8\ub2e4. \uc608\ub97c \ub4e4\uc5b4, \uc0ac\uc6a9\uc790\uac00 \ubc84\ud2bc\uc744 \ud074\ub9ad\ud558\uac70\ub098 \ub9c8\uc6b0\uc2a4\ub97c \uc6c0\uc9c1\uc77c \ub54c \uc774\ubca4\ud2b8\uac00 \ubc1c\uc0dd\ud569\ub2c8\ub2e4. \ub9ac\uc561\ud2b8\uc5d0\uc11c\ub294 \uc774\ub7ec\ud55c \uc774\ubca4\ud2b8\ub97c \uc27d\uac8c \ucc98\ub9ac\ud560 \uc218 \uc788\ub294 \ubc29\ubc95\uc744 \uc81c\uacf5\ud569\ub2c8\ub2e4. \uc0ac\uc6a9\uc790 \uc0c1\ud638\uc791\uc6a9\uc744 \ud1b5\ud574 \uc560\ud50c\ub9ac\ucf00\uc774\uc158\uc758 \uc0c1\ud0dc\ub97c \ubcc0\ud654\uc2dc\ud0ac \uc218 \uc788\uc2b5\ub2c8\ub2e4.<\/p>\n<h2>2. \ub9ac\uc561\ud2b8\uc758 \uc774\ubca4\ud2b8 \uc2dc\uc2a4\ud15c<\/h2>\n<p>\ub9ac\uc561\ud2b8\ub294 \uc790\uccb4 \uc774\ubca4\ud2b8 \uc2dc\uc2a4\ud15c\uc744 \uc0ac\uc6a9\ud569\ub2c8\ub2e4. \uc774\uac83\uc740 \ub9ac\uc561\ud2b8\uac00 DOM\uc744 \uc9c1\uc811 \uc218\uc815\ud558\ub294 \ub300\uc2e0 \uac00\uc0c1 DOM\uc744 \uc0ac\uc6a9\ud558\uc5ec \ucd5c\uc801\ud654\ub41c \uc5c5\ub370\uc774\ud2b8\ub97c \uc218\ud589\ud558\ub294 \ubc29\uc2dd\uc73c\ub85c \uc791\ub3d9\ud569\ub2c8\ub2e4. \ub9ac\uc561\ud2b8\uc758 \uc774\ubca4\ud2b8\ub294 \ud45c\uc900 DOM \uc774\ubca4\ud2b8\uc640 \uc720\uc0ac\ud558\uc9c0\ub9cc \uba87 \uac00\uc9c0 \ucc28\uc774\uc810\uc774 \uc788\uc2b5\ub2c8\ub2e4.<\/p>\n<h3>2.1 SyntheticEvent<\/h3>\n<p>\ub9ac\uc561\ud2b8\ub294 \ubaa8\ub4e0 \uc774\ubca4\ud2b8\uc5d0 \ub300\ud574 SyntheticEvent \uac1d\uccb4\ub97c \uc0dd\uc131\ud569\ub2c8\ub2e4. \uc774 \uac1d\uccb4\ub294 \ube0c\ub77c\uc6b0\uc800\uc758 \uae30\ubcf8 \uc774\ubca4\ud2b8\ub97c \ub798\ud551(wrap)\ud558\uc5ec \ud45c\uc900\ud654\ub41c API\ub97c \uc81c\uacf5\ud569\ub2c8\ub2e4. \uc608\ub97c \ub4e4\uc5b4, SyntheticEvent\ub294 <code>event.preventDefault()<\/code> \ubc0f <code>event.stopPropagation()<\/code> \uba54\uc11c\ub4dc\ub97c \uc81c\uacf5\ud569\ub2c8\ub2e4.<\/p>\n<h3>2.2 \uc774\ubca4\ud2b8 \ud578\ub4e4\ub7ec \ub4f1\ub85d<\/h3>\n<p>\ub9ac\uc561\ud2b8\uc5d0\uc11c \uc774\ubca4\ud2b8 \ud578\ub4e4\ub7ec\ub294 JSX \uc18d\uc131\uc744 \ud1b5\ud574 \ub4f1\ub85d\ud560 \uc218 \uc788\uc2b5\ub2c8\ub2e4. \uc608\ub97c \ub4e4\uc5b4, <code>onClick<\/code>, <code>onChange<\/code>, <code>onSubmit<\/code>\uacfc \uac19\uc740 \uc18d\uc131\uc744 \uc0ac\uc6a9\ud558\uc5ec \uc774\ubca4\ud2b8\ub97c \ucc98\ub9ac\ud560 \uc218 \uc788\uc2b5\ub2c8\ub2e4.<\/p>\n<pre><code>\nfunction MyButton() {\n    function handleClick() {\n        alert('\ubc84\ud2bc\uc774 \ud074\ub9ad\ub418\uc5c8\uc2b5\ub2c8\ub2e4!');\n    }\n\n    return (\n        &lt;button onClick={handleClick}&gt;\ud074\ub9ad\ud558\uc138\uc694&lt;\/button&gt;\n    );\n}\n<\/code><\/pre>\n<h2>3. \uc774\ubca4\ud2b8 \ud578\ub4e4\ub9c1\uc758 \uae30\ubcf8<\/h2>\n<p>\ub9ac\uc561\ud2b8\uc5d0\uc11c \uc774\ubca4\ud2b8\ub97c \ucc98\ub9ac\ud558\ub294 \uae30\ubcf8\uc801\uc778 \ubc29\ubc95\uc740 \uc704\uc5d0\uc11c \uc124\uba85\ud55c \uac83\ucc98\ub7fc \ud568\uc218\ub97c \uc815\uc758\ud558\uace0, \ud574\ub2f9 \ud568\uc218\ub97c JSX\uc5d0\uc11c \uc774\ubca4\ud2b8 \uc18d\uc131\uc73c\ub85c \uc804\ub2ec\ud558\ub294 \uac83\uc785\ub2c8\ub2e4. \uc5ec\uae30\uc5d0\uc11c\ub294 \uba87 \uac00\uc9c0 \uc77c\ubc18\uc801\uc778 \uc774\ubca4\ud2b8 \ud0c0\uc785\uc744 \uc0b4\ud3b4\ubcf4\uaca0\uc2b5\ub2c8\ub2e4.<\/p>\n<h3>3.1 \ub9c8\uc6b0\uc2a4 \uc774\ubca4\ud2b8<\/h3>\n<p>\ub9c8\uc6b0\uc2a4 \uc774\ubca4\ud2b8\ub294 \uc0ac\uc6a9\uc790 \uc778\ud130\ud398\uc774\uc2a4\uc640\uc758 \uc0c1\ud638\uc791\uc6a9\uc744 \ucc98\ub9ac\ud558\ub294 \ub370 \uc911\uc694\ud55c \uc5ed\ud560\uc744 \ud569\ub2c8\ub2e4. \ub2e4\uc74c\uc740 \ub9c8\uc6b0\uc2a4 \uc774\ubca4\ud2b8\uc758 \uc608\uc2dc\uc785\ub2c8\ub2e4:<\/p>\n<pre><code>\nfunction MouseEventExample() {\n    function handleMouseOver() {\n        console.log('\ub9c8\uc6b0\uc2a4\uac00 \uc694\uc18c \uc704\uc5d0 \uc788\uc2b5\ub2c8\ub2e4!');\n    }\n\n    return (\n        &lt;div onMouseOver={handleMouseOver}&gt;\ub9c8\uc6b0\uc2a4 \uc624\ubc84 \ud14c\uc2a4\ud2b8&lt;\/div&gt;\n    );\n}\n<\/code><\/pre>\n<h3>3.2 \ud0a4\ubcf4\ub4dc \uc774\ubca4\ud2b8<\/h3>\n<p>\ud0a4\ubcf4\ub4dc \uc774\ubca4\ud2b8\ub294 \uc0ac\uc6a9\uc790\uac00 \ud0a4\ubcf4\ub4dc\ub97c \ud1b5\ud574 \uc785\ub825\ud560 \ub54c \ubc1c\uc0dd\ud569\ub2c8\ub2e4. \ub2e4\uc74c\uc740 \ud0a4\uc785\ub825 \uc774\ubca4\ud2b8\uc758 \uae30\ubcf8 \uc608\uc785\ub2c8\ub2e4:<\/p>\n<pre><code>\nfunction KeyEventExample() {\n    function handleKeyPress(event) {\n        console.log('\uc785\ub825\ud55c \ud0a4:', event.key);\n    }\n\n    return (\n        &lt;input type=\"text\" onKeyPress={handleKeyPress} \/&gt;\n    );\n}\n<\/code><\/pre>\n<h3>3.3 \ud3fc \uc774\ubca4\ud2b8<\/h3>\n<p>\ub9ac\uc561\ud2b8\uc5d0\uc11c \ud3fc\uc744 \uc0ac\uc6a9\ud560 \ub54c\ub294 \uc785\ub825\uac12\uc744 \uad00\ub9ac\ud558\uae30 \uc704\ud574 \ud3fc \uc774\ubca4\ud2b8\ub97c \uc0ac\uc6a9\ud558\ub294 \uac83\uc774 \uc911\uc694\ud569\ub2c8\ub2e4. \ub2e4\uc74c\uc740 \ud3fc\uc758 \uc81c\ucd9c(submit) \uc774\ubca4\ud2b8\ub97c \ucc98\ub9ac\ud558\ub294 \uc608\uc785\ub2c8\ub2e4:<\/p>\n<pre><code>\nfunction FormExample() {\n    function handleSubmit(event) {\n        event.preventDefault(); \/\/ \uae30\ubcf8 \ub3d9\uc791 \ubc29\uc9c0\n        console.log('\ud3fc\uc774 \uc81c\ucd9c\ub418\uc5c8\uc2b5\ub2c8\ub2e4!');\n    }\n\n    return (\n        &lt;form onSubmit={handleSubmit}&gt;\n            &lt;input type=\"text\" \/&gt;\n            &lt;button type=\"submit\"&gt;\uc81c\ucd9c&lt;\/button&gt;\n        &lt;\/form&gt;\n    );\n}\n<\/code><\/pre>\n<h2>4. \uc774\ubca4\ud2b8 \uc804\ub2ec\uacfc \ubc14\uc778\ub529<\/h2>\n<p>\ub9ac\uc561\ud2b8\uc5d0\uc11c \uc774\ubca4\ud2b8 \ud578\ub4e4\ub7ec\ub97c \uc815\uc758\ud558\ub294 \ubc29\ubc95\uc740 \ub2e4\uc591\ud558\uba70, \ud074\ub798\uc2a4\ud615 \ucef4\ud3ec\ub10c\ud2b8\uc640 \ud568\uc218\ud615 \ucef4\ud3ec\ub10c\ud2b8\uc5d0\uc11c \ub2e4\ub974\uac8c \ub3d9\uc791\ud560 \uc218 \uc788\uc2b5\ub2c8\ub2e4. \uc774 \uc139\uc158\uc5d0\uc11c\ub294 \uc774\ubca4\ud2b8 \ud578\ub4e4\ub7ec\ub97c \ud074\ub798\uc2a4\ud615 \ucef4\ud3ec\ub10c\ud2b8\uc5d0\uc11c \uc5b4\ub5bb\uac8c \ubc14\uc778\ub529(binding)\ud558\ub294\uc9c0\uc5d0 \ub300\ud574 \uc54c\uc544\ubcf4\uaca0\uc2b5\ub2c8\ub2e4.<\/p>\n<h3>4.1 \ud074\ub798\uc2a4\ud615 \ucef4\ud3ec\ub10c\ud2b8\uc5d0\uc11c\uc758 \ubc14\uc778\ub529<\/h3>\n<p>\ud074\ub798\uc2a4\ud615 \ucef4\ud3ec\ub10c\ud2b8\uc5d0\uc11c\ub294 \uba54\uc11c\ub4dc\uac00 \uae30\ubcf8\uc801\uc73c\ub85c \ud074\ub798\uc2a4\uc758 \uc778\uc2a4\ud134\uc2a4\uc640 \uc5f0\uacb0\ub418\uc9c0 \uc54a\uc73c\ubbc0\ub85c, \uc774\ubca4\ud2b8 \ud578\ub4e4\ub7ec \uba54\uc11c\ub4dc\ub97c \ubc14\uc778\ub529\ud574\uc8fc\uc5b4\uc57c \ud569\ub2c8\ub2e4. \ub2e4\uc74c\uc740 \ud074\ub798\uc2a4\ub97c \uc0ac\uc6a9\ud55c \uc608\uc785\ub2c8\ub2e4:<\/p>\n<pre><code>\nclass MyComponent extends React.Component {\n    constructor(props) {\n        super(props);\n        this.handleClick = this.handleClick.bind(this);\n    }\n\n    handleClick() {\n        alert('\ud074\ub9ad\ub428!');\n    }\n\n    render() {\n        return (\n            &lt;button onClick={this.handleClick}&gt;\ud074\ub9ad\ud558\uc138\uc694&lt;\/button&gt;\n        );\n    }\n}\n<\/code><\/pre>\n<h3>4.2 \ud654\uc0b4\ud45c \ud568\uc218\ub97c \ud1b5\ud55c \ubc14\uc778\ub529<\/h3>\n<p>\ud074\ub798\uc2a4\ud615 \ucef4\ud3ec\ub10c\ud2b8\uc5d0\uc11c\ub294 \ud654\uc0b4\ud45c \ud568\uc218\ub97c \uc0ac\uc6a9\ud558\uc5ec \uba54\uc11c\ub4dc\ub97c \uc815\uc758\ud558\uba74 \uc790\ub3d9\uc73c\ub85c \ubc14\uc778\ub529\ub418\ub294 \ud6a8\uacfc\ub97c \uc5bb\uc744 \uc218 \uc788\uc2b5\ub2c8\ub2e4:<\/p>\n<pre><code>\nclass MyComponent extends React.Component {\n    handleClick = () =&gt; {\n        alert('\ud074\ub9ad\ub428!');\n    }\n\n    render() {\n        return (\n            &lt;button onClick={this.handleClick}&gt;\ud074\ub9ad\ud558\uc138\uc694&lt;\/button&gt;\n        );\n    }\n}\n<\/code><\/pre>\n<h2>5. \uc774\ubca4\ud2b8 \uc804\ud30c\uc640 \ucea1\ucc98\ub9c1<\/h2>\n<p>\uc774\ubca4\ud2b8\uac00 \uc6f9 \ud398\uc774\uc9c0\uc5d0\uc11c \ubc1c\uc0dd\ud560 \ub54c, \uc774\ubca4\ud2b8 \uc804\ud30c(event propagation)\uac00 \ubc1c\uc0dd\ud558\ub294\ub370, \uc774\uac83\uc740 \ub450 \uac00\uc9c0 \ub2e8\uacc4\ub85c \ub098\ub204\uc5b4\uc9d1\ub2c8\ub2e4: \ucea1\ucc98\ub9c1(capturing)\uacfc \ubc84\ube14\ub9c1(bubbling). \ub9ac\uc561\ud2b8\uc5d0\uc11c\ub294 \uc774 \ub450 \ub2e8\uacc4 \ubaa8\ub450\ub97c \uc9c0\uc6d0\ud569\ub2c8\ub2e4.<\/p>\n<h3>5.1 \ucea1\ucc98\ub9c1<\/h3>\n<p>\uc774\ubca4\ud2b8 \ucea1\ucc98\ub9c1\uc740 \uc774\ubca4\ud2b8\uac00 \ucd5c\uc0c1\uc704 \uc694\uc18c\uc5d0\uc11c \uc2dc\uc791\ud558\uc5ec \ud574\ub2f9 \uc774\ubca4\ud2b8\uac00 \ubc1c\uc0dd\ud55c \uc694\uc18c\ub85c \uc9c4\ud589\ub418\ub294 \ub2e8\uacc4\uc785\ub2c8\ub2e4. \uc774\ubca4\ud2b8 \ud578\ub4e4\ub7ec\ub294 <code>onClickCapture<\/code>\uc640 \uac19\uc740 \uc18d\uc131\uc744 \uc0ac\uc6a9\ud558\uc5ec \ucea1\ucc98\ub9c1 \ub2e8\uacc4\uc5d0\uc11c \ucc98\ub9ac\ud560 \uc218 \uc788\uc2b5\ub2c8\ub2e4.<\/p>\n<pre><code>\nfunction CapturingExample() {\n    function handleClickCapture() {\n        console.log('\ucea1\ucc98\ub9c1 \ub2e8\uacc4\uc5d0\uc11c \ud074\ub9ad\ub428!');\n    }\n\n    return (\n        &lt;div onClickCapture={handleClickCapture}&gt;\n            &lt;button&gt; \ud074\ub9ad\ud574\uc8fc\uc138\uc694 &lt;\/button&gt;\n        &lt;\/div&gt;\n    );\n}\n<\/code><\/pre>\n<h3>5.2 \ubc84\ube14\ub9c1<\/h3>\n<p>\ubc84\ube14\ub9c1\uc740 \uc774\ubca4\ud2b8\uac00 \ubc1c\uc0dd\ud55c \uc694\uc18c\uc5d0\uc11c \uc2dc\uc791\ud558\uc5ec \ucd5c\uc0c1\uc704 \uc694\uc18c\ub85c \uc804\ud30c\ub418\ub294 \ub2e8\uacc4\ub85c, <code>onClick<\/code>\uacfc \uac19\uc740 \uc77c\ubc18 \uc774\ubca4\ud2b8 \ud578\ub4e4\ub7ec\uc5d0\uc11c \ucc98\ub9ac\ub429\ub2c8\ub2e4. \ub9ac\uc561\ud2b8\uc758 \uc774\ubca4\ud2b8 \uc2dc\uc2a4\ud15c\uc5d0\uc11c\ub294 \uc774 \ub450 \uac00\uc9c0\ub97c \ubaa8\ub450 \ub2e4\ub8f0 \uc218 \uc788\uc2b5\ub2c8\ub2e4.<\/p>\n<h2>6. \uc5ec\ub7ec \uc774\ubca4\ud2b8 \ucc98\ub9ac\ud558\uae30<\/h2>\n<p>\ub9ac\uc561\ud2b8 \uc560\ud50c\ub9ac\ucf00\uc774\uc158\uc5d0\uc11c\ub294 \uc885\uc885 \ub2e4\uc591\ud55c \uc774\ubca4\ud2b8\ub97c \ub3d9\uc2dc\uc5d0 \ucc98\ub9ac\ud574\uc57c \ud569\ub2c8\ub2e4. \uc774 \uacbd\uc6b0, \uc5ec\ub7ec \uc774\ubca4\ud2b8 \ud578\ub4e4\ub7ec\ub97c \ud558\ub098\uc758 \ucef4\ud3ec\ub10c\ud2b8\uc5d0\uc11c \uc815\uc758\ud558\uc5ec \uac01\uac01\uc758 \uc774\ubca4\ud2b8\ub97c \ucc98\ub9ac\ud560 \uc218 \uc788\uc2b5\ub2c8\ub2e4:<\/p>\n<pre><code>\nfunction MultiEventExample() {\n    function handleClick() {\n        console.log('\ubc84\ud2bc \ud074\ub9ad\ub428');\n    }\n\n    function handleMouseOver() {\n        console.log('\ub9c8\uc6b0\uc2a4 \uc624\ubc84\ub428');\n    }\n\n    return (\n        &lt;button onClick={handleClick} onMouseOver={handleMouseOver}&gt;\ubc84\ud2bc&lt;\/button&gt;\n    );\n}\n<\/code><\/pre>\n<h2>7. \ucee4\uc2a4\ud140 \ud6c5\uc744 \ud1b5\ud55c \uc774\ubca4\ud2b8 \ucc98\ub9ac<\/h2>\n<p>\ub9ac\uc561\ud2b8\uc5d0\uc11c\ub294 \ud6c5\uc744 \uc0ac\uc6a9\ud558\uc5ec \uc7ac\uc0ac\uc6a9 \uac00\ub2a5\ud55c \ub85c\uc9c1\uc744 \ub9cc\ub4e4 \uc218 \uc788\uc2b5\ub2c8\ub2e4. \uc774\ubca4\ud2b8 \ud578\ub4e4\ub7ec\ub97c \ucee4\uc2a4\ud140 \ud6c5\uc73c\ub85c \uad6c\ud604\ud558\uba74 \ud504\ub85c\uadf8\ub7a8\uc758 \uac00\ub3c5\uc131\uacfc \uc720\uc9c0\ubcf4\uc218\uc131\uc774 \ud5a5\uc0c1\ub429\ub2c8\ub2e4.<\/p>\n<pre><code>\nimport { useState } from 'react';\n\nfunction useEventHandler() {\n    const [count, setCount] = useState(0);\n\n    function increment() {\n        setCount(count + 1);\n    }\n\n    return [count, increment];\n}\n\nfunction EventHandlerExample() {\n    const [count, increment] = useEventHandler();\n\n    return (\n        &lt;div&gt;\n            &lt;p&gt;\uce74\uc6b4\ud2b8: {count}&lt;\/p&gt;\n            &lt;button onClick={increment}&gt;\uc99d\uac00&lt;\/button&gt;\n        &lt;\/div&gt;\n    );\n}\n<\/code><\/pre>\n<h2>8. \uc131\ub2a5 \ucd5c\uc801\ud654<\/h2>\n<p>\ub9ac\uc561\ud2b8\uc5d0\uc11c\ub294 \uc774\ubca4\ud2b8 \ucc98\ub9ac\uac00 \ube48\ubc88\ud558\uac8c \ubc1c\uc0dd\ud560 \uc218 \uc788\uc73c\ubbc0\ub85c, \uc131\ub2a5 \ucd5c\uc801\ud654\uac00 \uc911\uc694\ud569\ub2c8\ub2e4. \ub2e4\uc74c\uc740 \uc131\ub2a5\uc744 \ud5a5\uc0c1\uc2dc\ud0a4\uae30 \uc704\ud55c \uba87 \uac00\uc9c0 \ubc29\ubc95\uc785\ub2c8\ub2e4:<\/p>\n<h3>8.1 React.memo \uc0ac\uc6a9\ud558\uae30<\/h3>\n<p>\ub9ac\uc561\ud2b8\uc758 <code>React.memo<\/code>\ub97c \uc0ac\uc6a9\ud558\uc5ec \ucef4\ud3ec\ub10c\ud2b8\ub97c \uba54\ubaa8\uc774\uc81c\uc774\uc158(memoization) \ud560 \uc218 \uc788\uc2b5\ub2c8\ub2e4. \uc774\ub97c \ud1b5\ud574 \ubd88\ud544\uc694\ud55c \ub9ac\ub80c\ub354\ub9c1\uc744 \ubc29\uc9c0\ud560 \uc218 \uc788\uc2b5\ub2c8\ub2e4.<\/p>\n<pre><code>\nconst MyComponent = React.memo(function MyComponent({ onClick }) {\n    return &lt;button onClick={onClick}&gt;\ud074\ub9ad\ud558\uc138\uc694&lt;\/button&gt;;\n});\n<\/code><\/pre>\n<h3>8.2 useCallback \ud6c5 \uc0ac\uc6a9\ud558\uae30<\/h3>\n<p><code>useCallback<\/code> \ud6c5\uc744 \uc0ac\uc6a9\ud558\uc5ec \uc774\ubca4\ud2b8 \ud578\ub4e4\ub7ec\ub97c \uba54\ubaa8\uc774\uc81c\uc774\uc158\ud558\uba74 \ucef4\ud3ec\ub10c\ud2b8\uac00 \ub9ac\ub80c\ub354\ub9c1\ub420 \ub54c\ub3c4 \ud578\ub4e4\ub7ec\ub97c \uc0c8\ub85c \uc0dd\uc131\ud558\uc9c0 \uc54a\ub3c4\ub85d \ud560 \uc218 \uc788\uc2b5\ub2c8\ub2e4.<\/p>\n<pre><code>\nimport { useCallback } from 'react';\n\nfunction EventOptimizationExample() {\n    const handleClick = useCallback(() =&gt; {\n        console.log('\ud074\ub9ad\ub428!');\n    }, []);\n\n    return &lt;button onClick={handleClick}&gt;\ud074\ub9ad\ud558\uc138\uc694&lt;\/button&gt;;\n}\n<\/code><\/pre>\n<h2>9. \uacb0\ub860<\/h2>\n<p>\uc774\ubc88 \uac15\uc88c\uc5d0\uc11c\ub294 \ub9ac\uc561\ud2b8\uc5d0\uc11c \uc774\ubca4\ud2b8 \ucc98\ub9ac\ud558\uae30\uc5d0 \ub300\ud574 \uc790\uc138\ud788 \uc0b4\ud3b4\ubcf4\uc558\uc2b5\ub2c8\ub2e4. \ub9ac\uc561\ud2b8\uc758 \uc774\ubca4\ud2b8 \uc2dc\uc2a4\ud15c\uacfc \ub2e4\uc591\ud55c \uc774\ubca4\ud2b8 \ud0c0\uc785, \ud6a8\uc728\uc801\uc778 \uc774\ubca4\ud2b8 \ucc98\ub9ac \ubc29\ubc95\uc5d0 \ub300\ud574 \uc774\ud574\ud568\uc73c\ub85c\uc368, \uc0ac\uc6a9\uc790\uc640 \ub354 \ub098\uc740 \uc0c1\ud638\uc791\uc6a9\uc744 \uad6c\ud604\ud560 \uc218 \uc788\uc2b5\ub2c8\ub2e4. \uc55e\uc73c\ub85c\ub3c4 \ub9ac\uc561\ud2b8\ub97c \ud65c\uc6a9\ud558\uc5ec \uace0\ud488\uc9c8\uc758 \uc560\ud50c\ub9ac\ucf00\uc774\uc158\uc744 \uac1c\ubc1c\ud558\ub294 \ub370 \ub3c4\uc6c0\uc774 \ub418\uc2dc\uae38 \ubc14\ub78d\ub2c8\ub2e4.<\/p>\n<p>\ub2e4\uc74c \uac15\uc88c\uc5d0\uc11c\ub294 \ub9ac\uc561\ud2b8\uc640 \ud568\uaed8 \uc0c1\ud0dc \uad00\ub9ac \ubc0f \ube44\ub3d9\uae30 \ucc98\ub9ac\uc5d0 \ub300\ud574 \ub2e4\ub8f0 \uc608\uc815\uc785\ub2c8\ub2e4. \uacc4\uc18d\ud574\uc11c \ub9ac\uc561\ud2b8\uc758 \ub9e4\ub825\uc744 \ud0d0\uad6c\ud574\ubd05\uc2dc\ub2e4!<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\ub9ac\uc561\ud2b8\ub294 \uc0ac\uc6a9\uc790 \uc778\ud130\ud398\uc774\uc2a4\ub97c \uad6c\ucd95\ud558\uae30 \uc704\ud55c \ub9e4\uc6b0 \uc720\uc6a9\ud55c \ub77c\uc774\ube0c\ub7ec\ub9ac\uc785\ub2c8\ub2e4. \uc774\ubca4\ud2b8 \ucc98\ub9ac(event handling)\ub294 \ub9ac\uc561\ud2b8 \uc560\ud50c\ub9ac\ucf00\uc774\uc158\uc5d0\uc11c \uc0ac\uc6a9\uc790 \uc785\ub825\uc744 \ucc98\ub9ac\ud558\ub294 \ub370 \ud544\uc218\uc801\uc785\ub2c8\ub2e4. \uc774 \uac15\uc88c\uc5d0\uc11c\ub294 \ub9ac\uc561\ud2b8\uc5d0\uc11c \uc774\ubca4\ud2b8\ub97c \ucc98\ub9ac\ud558\ub294 \ubc29\ubc95\uc5d0 \ub300\ud574 \uae4a\uc774 \uc788\uac8c \uc54c\uc544\ubcf4\uaca0\uc2b5\ub2c8\ub2e4. 1. \uc774\ubca4\ud2b8\ub780? \uc774\ubca4\ud2b8\ub294 \ube0c\ub77c\uc6b0\uc800\uc5d0\uc11c \ubc1c\uc0dd\ud558\ub294 \ud2b9\uc815 \ub3d9\uc791 \ub610\ub294 \uc0c1\ud0dc \ubcc0\ud654\uc785\ub2c8\ub2e4. \uc608\ub97c \ub4e4\uc5b4, \uc0ac\uc6a9\uc790\uac00 \ubc84\ud2bc\uc744 \ud074\ub9ad\ud558\uac70\ub098 \ub9c8\uc6b0\uc2a4\ub97c \uc6c0\uc9c1\uc77c \ub54c \uc774\ubca4\ud2b8\uac00 \ubc1c\uc0dd\ud569\ub2c8\ub2e4. \ub9ac\uc561\ud2b8\uc5d0\uc11c\ub294 \uc774\ub7ec\ud55c \uc774\ubca4\ud2b8\ub97c \uc27d\uac8c \ucc98\ub9ac\ud560 \uc218 \uc788\ub294 &hellip; <a href=\"https:\/\/atmokpo.com\/w\/25954\/\" class=\"more-link\">\ub354 \ubcf4\uae30<span class=\"screen-reader-text\"> &#8220;\ub9ac\uc561\ud2b8 \uac15\uc88c: \uc774\ubca4\ud2b8 \ucc98\ub9ac\ud558\uae30&#8221;<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[20],"tags":[],"class_list":["post-25954","post","type-post","status-publish","format-standard","hentry","category-20"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.2 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>\ub9ac\uc561\ud2b8 \uac15\uc88c: \uc774\ubca4\ud2b8 \ucc98\ub9ac\ud558\uae30 - \ub77c\uc774\ube0c\uc2a4\ub9c8\ud2b8<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/atmokpo.com\/w\/25954\/\" \/>\n<meta property=\"og:locale\" content=\"ko_KR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"\ub9ac\uc561\ud2b8 \uac15\uc88c: \uc774\ubca4\ud2b8 \ucc98\ub9ac\ud558\uae30 - \ub77c\uc774\ube0c\uc2a4\ub9c8\ud2b8\" \/>\n<meta property=\"og:description\" content=\"\ub9ac\uc561\ud2b8\ub294 \uc0ac\uc6a9\uc790 \uc778\ud130\ud398\uc774\uc2a4\ub97c \uad6c\ucd95\ud558\uae30 \uc704\ud55c \ub9e4\uc6b0 \uc720\uc6a9\ud55c \ub77c\uc774\ube0c\ub7ec\ub9ac\uc785\ub2c8\ub2e4. \uc774\ubca4\ud2b8 \ucc98\ub9ac(event handling)\ub294 \ub9ac\uc561\ud2b8 \uc560\ud50c\ub9ac\ucf00\uc774\uc158\uc5d0\uc11c \uc0ac\uc6a9\uc790 \uc785\ub825\uc744 \ucc98\ub9ac\ud558\ub294 \ub370 \ud544\uc218\uc801\uc785\ub2c8\ub2e4. \uc774 \uac15\uc88c\uc5d0\uc11c\ub294 \ub9ac\uc561\ud2b8\uc5d0\uc11c \uc774\ubca4\ud2b8\ub97c \ucc98\ub9ac\ud558\ub294 \ubc29\ubc95\uc5d0 \ub300\ud574 \uae4a\uc774 \uc788\uac8c \uc54c\uc544\ubcf4\uaca0\uc2b5\ub2c8\ub2e4. 1. \uc774\ubca4\ud2b8\ub780? \uc774\ubca4\ud2b8\ub294 \ube0c\ub77c\uc6b0\uc800\uc5d0\uc11c \ubc1c\uc0dd\ud558\ub294 \ud2b9\uc815 \ub3d9\uc791 \ub610\ub294 \uc0c1\ud0dc 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