{"id":5179,"date":"2019-12-04T05:36:23","date_gmt":"2019-12-03T20:36:23","guid":{"rendered":"https:\/\/blog.capilano-fw.com\/?p=5179"},"modified":"2019-12-04T05:36:23","modified_gmt":"2019-12-03T20:36:23","slug":"%e3%81%99%e3%81%90%e3%81%a7%e3%81%8d%e3%82%8b%ef%bc%81vue%e3%81%a7lazy-loading-%e3%82%92%e5%ae%9f%e8%a3%85%e3%81%99%e3%82%8b","status":"publish","type":"post","link":"https:\/\/blog.capilano-fw.com\/?p=5179","title":{"rendered":"\u3059\u3050\u3067\u304d\u308b\uff01Vue\u3067lazy loading \u3092\u5b9f\u88c5\u3059\u308b"},"content":{"rendered":"

\u3055\u3066\u3055\u3066\u3001\u3053\u306e\u30d6\u30ed\u30b0\u3067\u306fLaravel<\/code>\u306e\u8a18\u4e8b\u3068\u4e26\u3093\u3067Vue.js<\/code>\u306b\u95a2\u3059\u308b\u8a18\u4e8b\u3082\u591a\u304f\u516c\u958b\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n

Vue<\/code>\u306f\u79c1\u304c\u4f7f\u3063\u305fJS<\/code>\u30d5\u30ec\u30fc\u30e0\u30ef\u30fc\u30af\u306e\u4e2d\u3067\u4e00\u756a\u3059\u3050\u4f7f\u3048\u308b\uff08\uff1d\u5b66\u7fd2\u30b3\u30b9\u30c8\u304c\u4f4e\u3044\uff09\u3068\u8003\u3048\u3066\u3044\u3066\u3001JavaScript<\/code>\u306e\u77e5\u8b58\u304c\u3042\u308c\u3070\u304a\u305d\u3089\u304fVue\u306f\uff12\u3001\uff13\u65e5\u3082\u3042\u308c\u3070\u57fa\u672c\u7684\u306a\u52d5\u4f5c\u306f\u30de\u30b9\u30bf\u30fc\u3067\u304d\u308b\u3093\u3058\u3083\u306a\u3044\u304b\u3068\u601d\u3063\u3066\u3044\u307e\u3059\u3002<\/p>\n

\u305d\u306e\u305f\u3081\u3001\u4ed6\u306e\u958b\u767a\u8005\u3055\u3093\u3068\u5171\u540c\u3067\u4f5c\u696d\u3092\u3059\u308b\u969b\u3067\u3082\u3067\u304d\u308b\u3060\u3051Vue<\/code>\u3092\u4f7f\u3046\u3088\u3046\u306b\u63d0\u6848\u3092\u3057\u3066\u3044\u307e\u3059\u3002\uff08\u3082\u3061\u308d\u3093React<\/code>\u3082\u7d20\u6674\u3089\u3057\u3044\u3093\u3067\u3059\u304c\u3001\u5b66\u7fd2\u30b3\u30b9\u30c8\u306fVue<\/code>\u3088\u308a\u3082\u9ad8\u3044\u306e\u3067React<\/code>\u7d4c\u9a13\u8005\u3067\u306a\u3044\u3068\u6bd4\u8f03\u7684\u5f15\u304d\u7d99\u304e\u3057\u306b\u304f\u3044\u3068\u8003\u3048\u3066\u3044\u307e\u3059\u3002\u3042\u3068\u306f\u3044\u3061\u3044\u3061\u30d3\u30eb\u30c9\u3059\u308b\u306e\u304c\u3069\u3046\u3057\u3066\u3082\u597d\u304d\u3058\u3083\u306a\u3044\u3093\u3067\u3059\u30fc\ud83d\ude2b\uff09<\/p>\n

\u305d\u3057\u3066\u3001\u4eca\u56de\u306f\u305d\u3093\u306aVue<\/code>\u3067\uff11\u3064\u3084\u3063\u3066\u307f\u3088\u3046\u3068\u601d\u3063\u3066\u3044\u305f\u6a5f\u80fd\u3092\u601d\u3044\u51fa\u3057\u307e\u3057\u305f\u3002<\/p>\n

\u305d\u308c\u304c\u3001<\/p>\n

Lazy Loading\uff08\u308c\u3044\u3058\u30fc\u308d\u30fc\u3067\u3043\u3093\u3050\uff09<\/strong><\/p>\n

\u3067\u3059\u3002<\/p>\n

Lazy Loading<\/code>\u3068\u3044\u3046\u306e\u306f\u3001\u5143\u3005\u30a4\u30f3\u30bf\u30fc\u30cd\u30c3\u30c8\u56de\u7dda\u304c\u9045\u304f\u3066\u3082\u30b9\u30c8\u30ec\u30b9\u3092\u611f\u3058\u306a\u3044\u3088\u3046\u306b\u30da\u30fc\u30b8\u8aad\u307f\u8fbc\u307f\u3059\u308b\u305f\u3081\u306b\u8003\u3048\u3089\u308c\u305f\u30c6\u30af\u30cb\u30c3\u30af\u3067\u3001\u4f8b\u3048\u3070\u4ee5\u4e0b\u306e\u753b\u50cf\u3092\u898b\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n

\"\"<\/p>\n

\u3053\u308c\u306f\u3001\u5143\u753b\u50cf\u306f50 x 50 px<\/code>\u306e\u5c0f\u3055\u306a\u30b5\u30e0\u30cd\u30a4\u30eb\u3067\u3059\u304c300 x 300 px<\/code> \u306b\u5f15\u304d\u4f38\u3070\u3057\u3066\u8868\u793a\u3057\u305f\u3082\u306e\u3067\u3059\u3002\uff08\u3067\u3059\u306e\u3067\u3001\u307c\u3084\u3051\u3066\u3044\u307e\u3059\uff09<\/p>\n

\u3053\u306e\u3088\u3046\u306b\u30da\u30fc\u30b8\u304c\u8aad\u307f\u8fbc\u307e\u308c\u305f\u3068\u304d\u306f\u3001\u5c0f\u3055\u306a\u753b\u50cf\u3092\u8aad\u307f\u8fbc\u3093\u3067\u8868\u793a\u3057\u3066\u304a\u304d\u3001\u5f8c\u3067\u5c11\u3057\u305a\u3064\u30aa\u30ea\u30b8\u30ca\u30eb\u306e\uff08\u3053\u306e\u5834\u5408\u306f300 x 300 px\u306e\uff09\u5927\u304d\u306a\u753b\u50cf\u3092\u8aad\u307f\u8fbc\u3080\u3068\u3044\u3046\u6a5f\u80fd\u304c\u300cLazy Loading\uff08\u9045\u5ef6\u8aad\u307f\u8fbc\u307f\uff09\u300d<\/strong>\u3068\u547c\u3070\u308c\u308b\u3082\u306e\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n

\u3064\u307e\u308a\u3001Lazy Loading<\/code>\u3092\u4f7f\u3048\u3070\u3001\u3082\u3057\u30da\u30fc\u30b8\u5185\u306b\u5927\u304d\u306a\u753b\u50cf\u304c\u3042\u3063\u305f\u3068\u3057\u3066\u3082\u753b\u50cf\u304c\u5fc5\u8981\u306a\u3068\u304d\u306b\u8aad\u307f\u8fbc\u307e\u308c\u308b\u306e\u3067\u30da\u30fc\u30b8\u8868\u793a\u306f\u65e9\u304f\u306a\u308b\u3068\u3044\u3046\u308f\u3051\u3067\u3059\u306d\u3002<\/p>\n

\u3068\u3044\u3046\u3053\u3068\u3067\uff01<\/p>\n

\u4eca\u56de\u306fVue<\/code>\u3067\u3053\u306eLazy Loading<\/code>\u3092\u5b9f\u88c5\u3057\u3066\u307f\u305f\u3044\u3068\u601d\u3044\u307e\u3059\u3002<\/p>\n

\u305c\u3072\u7686\u3055\u3093\u306e\u304a\u5f79\u306b\u7acb\u3066\u308b\u3068\u5b09\u3057\u3044\u3067\u3059\ud83d\ude0a\u2728<\/p>\n

\"\"<\/p>\n

\u958b\u767a\u74b0\u5883\uff1a Vue 2.6\u3001ES6<\/p>\n

\u3084\u308a\u305f\u3044\u3053\u3068<\/h1>\n

\u4eca\u56de\u306fVue<\/code>\u306e\u6301\u3064\u6a5f\u80fd\u300c\u30ab\u30b9\u30bf\u30e0\u30fb\u30c7\u30a3\u30ec\u30af\u30c6\u30a3\u30d6\u300d<\/strong>\u3092\u3064\u304f\u3063\u3066\u5b9f\u88c5\u3057\u3066\u3044\u304d\u307e\u3059\u3002<\/p>\n

\u30c7\u30a3\u30ec\u30af\u30c6\u30a3\u30d6\u3092\u4f7f\u3063\u305f\u4f8b\u306f\u3053\u3061\u3089\u3067\u3059\u3002<\/p>\n

<img\r\n    src=\"\uff08\u30b5\u30e0\u30cd\u30a4\u30eb\u306eURL\uff09\"\r\n    v-lazy-loading=\"'\uff08\u30aa\u30ea\u30b8\u30ca\u30eb\u306eURL\uff09'\"<\/a>><\/pre>\n
\u305d\u3057\u3066\u3001\u30aa\u30ea\u30b8\u30ca\u30eb\u306eURL\u304c\u30ed\u30fc\u30c9\u3055\u308c\u308b\u306e\u306f\u3001\u300c\u8868\u793a\u4e2d\u306e\u30a6\u30a3\u30f3\u30c9\u30a6\u306e\u4e2d\u306b\u753b\u50cf\u304c\u5165\u3063\u305f\u3068\u304d\u300d<\/strong>\u3068\u3057\u307e\u3059\u3002<\/p>\n
\u3064\u307e\u308a\u3001\u3053\u306e\u3088\u3046\u306a\u72b6\u614b\u3067\u3059\u3002<\/p>\n
\"\"<\/p>\n
\u307e\u305f\u3001\u305b\u3063\u304b\u304f\u72ec\u81ea\u306e\u30c7\u30a3\u30ec\u30af\u30c6\u30a3\u30d6\u3092\u3064\u304f\u308b\u306e\u3067Lazy Loading<\/code>\u304c\u5b8c\u4e86\u3057\u305f\u3089lazy-load<\/code>\u3068\u3044\u3046\u72ec\u81ea\u30a4\u30d9\u30f3\u30c8\u3082\u5b9f\u884c\u3067\u304d\u308b\u3088\u3046\u306b\u3057\u3066\u3044\u304d\u307e\u3059\u3002<\/p>\n
\u3067\u306f\u5b9f\u969b\u306b\u3084\u3063\u3066\u3044\u304d\u307e\u3057\u3087\u3046\uff01<\/p>\n
\u3061\u306a\u307f\u306b\u4eca\u56de\u306f\u300c\u5b50\u4f9b\u5411\u3051\u96d1\u8a8c\u306e\u4ed8\u9332\u300d\u306e\u3088\u3046\u306b\u57fa\u672c\u306e\u30b3\u30fc\u30c9\u306b\u756a\u53f7\u304c\u3075\u3063\u3066\u3042\u3063\u3066\u3001\u305d\u308c\u306b\u30b3\u30fc\u30c9\u3092\u306f\u3081\u8fbc\u3093\u3067\u3044\u3051\u3070\u5b8c\u6210\u3059\u308b<\/strong>\u3068\u3044\u3046\u521d\u306e\u8a66\u307f\u3067\u8a71\u3092\u9032\u3081\u3066\u3044\u304d\u305f\u3044\u3068\u601d\u3044\u307e\u3059\u3002<\/p>\n
\u305c\u3072\u697d\u3057\u3093\u3067\u3084\u3063\u3066\u307f\u3066\u304f\u3060\u3055\u3044\ud83d\ude0a\u2728<\/p>\n
\u4eca\u56de\u4f7f\u3046\u753b\u50cf\u306b\u3064\u3044\u3066<\/h1>\n
\u4eca\u56de\u4f7f\u3046\u753b\u50cf\u306fURL\u3092\u6307\u5b9a\u3059\u308b\u3060\u3051\u3067\u597d\u304d\u306a\u30b5\u30a4\u30ba\u306e\u753b\u50cf\u304c\u4f7f\u3048\u308bCDN<\/code>\u306eplaceholder.com<\/a>\u3092\u4f7f\u3044\u307e\u3059\u3002\u4f8b\u3048\u3070\u3001500 x 300<\/code> \u306e\u753b\u50cf\u304c\u307b\u3057\u3051\u308c\u3070\u3001<\/p>\n
<img src=\"https:\/\/via.placeholder.com\/500x300\"><\/strong><\/pre>\n
\u3068\u3059\u308b\u3060\u3051\u3067OK\u3067\u3059\u3002<\/p>\n
\u5b9f\u969b\u306e\u8868\u793a\u306f\u3053\u306e\u3088\u3046\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n
\"\"<\/p>\n
\u57fa\u672c\u306eHTML\u30b3\u30fc\u30c9<\/h1>\n
\u3067\u306f\u3001\u307e\u305a\u521d\u3081\u306b\u57fa\u672c\u3068\u306a\u308bHTML\u30b3\u30fc\u30c9\u3067\u3059\u3002
\n\u3053\u306e\u4e2d\u306b\u3075\u3063\u3066\u3042\u308b\u756a\u53f7\u306b\u30b3\u30fc\u30c9\u3092\u8ffd\u52a0\u3057\u306a\u304c\u3089\u5b8c\u6210\u3055\u305b\u3066\u3044\u304d\u307e\u3059\u3002<\/p>\n
<html>\r\n<head>\r\n\r\n    <!-- \u2460 \u753b\u50cf\u306e\u30b9\u30bf\u30a4\u30eb\u30b7\u30fc\u30c8\u3092\u3064\u304f\u308b --><\/strong>\r\n\r\n<\/head>\r\n<body>\r\n    <div id=\"app\">\r\n        <div v-for=\"i in 100\">\r\n            <!-- \u2464 \u753b\u50cf\u30bf\u30b0\u3092\u3064\u304f\u308b --><\/strong>\r\n        <\/div>\r\n    <\/div>\r\n    <script src=\"https:\/\/cdn.jsdelivr.net\/npm\/vue@2.6.0\"><\/script>\r\n    <script>\r\n\r\n        \/\/ \u2463 Vue\u306e\u30df\u30c3\u30af\u30b9\u30a4\u30f3\u3067\u300cv-lazy-loading\u300d\u304c\u4f7f\u3046\u95a2\u6570\u3092\u3064\u304f\u308b<\/strong>\r\n\r\n        \/\/ \u2462 Vue\u306e\u30ab\u30b9\u30bf\u30e0\u30fb\u30c7\u30a3\u30ec\u30af\u30c6\u30a3\u30d6\u300cv-lazy-loading\u300d\u3092\u3064\u304f\u308b<\/strong>\r\n\r\n        \/\/ \u2461 Vue\u306e\u57fa\u672c\u5f62\u3092\u3064\u304f\u308b<\/strong>\r\n\r\n    <\/script>\r\n<\/body>\r\n<\/html><\/pre>\n
\u3053\u306e\u57fa\u672c\u30b3\u30fc\u30c9\u3092lazy_loading.html<\/code>\u306e\u3088\u3046\u306a\u540d\u524d\u3067\u30d5\u30a1\u30a4\u30eb\u4fdd\u5b58\u3057\u3066\u304a\u304f\u3068\u30d6\u30ed\u30b0\u3092\u8aad\u307f\u9032\u3081\u306a\u304c\u3089\u30b3\u30fc\u30c9\u3092\u8ffd\u52a0\u3057\u3066\u3044\u304f\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3088\uff01<\/p>\n
\u753b\u50cf\u306e\u30b9\u30bf\u30a4\u30eb\u30b7\u30fc\u30c8\u3092\u3064\u304f\u308b\u30fb\u30fb\u30fb\u2460\u756a<\/h1>\n
\u8868\u793a\u3059\u308b\u753b\u50cf\u306e\u30b5\u30a4\u30ba\u3092\u30b9\u30bf\u30a4\u30eb\u30b7\u30fc\u30c8\u3067\u6307\u5b9a\u3057\u3066\u304a\u304d\u307e\u3057\u3087\u3046\u3002\u3053\u3046\u3059\u308b\u3053\u3068\u3067\u3001\u5148\u306b\u8aad\u307f\u8fbc\u307e\u308c\u308b\u753b\u50cf\u306f\u5c0f\u3055\u3044\u3067\u3059\u304c\u30b5\u30a4\u30ba\u3092\u56fa\u5b9a\u3055\u305b\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\uff08\u3064\u307e\u308a\u3001\u753b\u50cf\u306f\u307c\u3084\u3051\u307e\u3059\uff09<\/p>\n
<style><\/strong>\r\n\r\n    img {<\/strong>\r\n\r\n        width: 300px;<\/strong>\r\n        height: 300px;<\/strong>\r\n\r\n    }<\/strong>\r\n\r\n<\/style><\/strong><\/pre>\n
Vue\u306e\u57fa\u672c\u5f62\u3092\u3064\u304f\u308b\u30fb\u30fb\u30fb\u2461<\/h1>\n
\u7d9a\u3044\u3066\u306f\u3001Vue<\/code>\u306e\u57fa\u672c\u5f62\u3067\u3059\u3002
\n\u3053\u306e\u4e2d\u306b\u306f\u3001\u3055\u3089\u306b\u5225\u306e\u4f5c\u696d\u2465\u304c\u3042\u308a\u307e\u3059\u304c\u3001\u4eca\u306f\u3053\u306e\u307e\u307e\u30b3\u30fc\u30c9\u3092\u8ffd\u52a0\u3057\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n
new Vue({<\/strong>\r\n    el: '#app',<\/strong>\r\n\r\n    \/\/ \u2465 \u72ec\u81ea\u30a4\u30d9\u30f3\u30c8\u306e\u30e1\u30bd\u30c3\u30c9\u3092\u3064\u304f\u308b<\/strong>\r\n\r\n});<\/strong><\/pre>\n
\u306a\u304a\u3001#app<\/code>\u306f<div id=\"app\">\u301c<\/div><\/code>\u306e\u3053\u3068\u3092\u6307\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n
Vue\u306e\u30ab\u30b9\u30bf\u30e0\u30fb\u30c7\u30a3\u30ec\u30af\u30c6\u30a3\u30d6\u300cv-lazy-loading\u300d\u3092\u3064\u304f\u308b\u30fb\u30fb\u30fb\u2462<\/h1>\n
\u4eca\u56de\u306e\u30c6\u30fc\u30de\u306f\u30ab\u30b9\u30bf\u30e0\u30fb\u30c7\u30a3\u30ec\u30af\u30c6\u30a3\u30d6\u3067\u3059\u304c\u3001\u5b9f\u306fLazy Loading<\/code>\u306e\u6027\u8cea\u4e0a\u30e1\u30a4\u30f3\u306e\u30b3\u30fc\u30c9\u306f\u3082\u3046\u4e00\u3064\u306e\u30df\u30c3\u30af\u30b9\u30a4\u30f3\u306e\u65b9\u306b\u591a\u304f\u306f\u3044\u3063\u3066\u3044\u308b\u305f\u3081\u30b3\u30fc\u30c9\u91cf\u306f\u5c11\u306a\u3081\u3067\u3059\u3002<\/p>\n
Vue.directive('lazy-loading', {<\/strong>\r\n    bind(el, binding) {<\/strong>\r\n\r\n        el.setAttribute('original-src', binding.value)<\/strong>\r\n\r\n    },<\/strong>\r\n    inserted(el) {<\/strong>\r\n\r\n        el.className += ' waiting-load';<\/strong>\r\n\r\n    }<\/strong>\r\n});<\/strong><\/pre>\n
\u306a\u304a\u3001bind()<\/code>\u3067<\/span>\u306fv-lazyloading<\/code>\u3067\u6307\u5b9a\u3059\u308b\u30aa\u30ea\u30b8\u30ca\u30eb\u306e\u5927\u304d\u306a\u753b\u50cf\u306eURL\u3092\u4e00\u65e6original-src<\/code>\u3068\u3044\u3046\u30d7\u30ed\u30d1\u30c6\u30a3\u306b\u4fdd\u6301\u3057\u3066\u3044\u307e\u3059\u3002<\/span><\/p>\n
<img\r\n    src=\"\uff08\u5148\u306b\u8868\u793a\u3059\u308b\u5c0f\u3055\u306a\u753b\u50cf\u306eURL\uff09\"\r\n    v-lazy-loading=\"\uff08\u30aa\u30ea\u30b8\u30ca\u30eb\u753b\u50cf\u306eURL\uff09<\/strong>\"><\/pre>\n
\u307e\u305f\u3001inserted()<\/code>\u3067\u306f\u3001\u3042\u3068\u3067Lazy Loading<\/code>\u3059\u3079\u304d\u753b\u50cf\u304c\u5224\u5225\u3067\u304d\u308b\u3088\u3046\u300cwaiting-load\u300d<\/strong>\u3068\u3044\u3046\u30af\u30e9\u30b9\u540d\u3092\u8ffd\u52a0\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n
Vue\u306e\u30df\u30c3\u30af\u30b9\u30a4\u30f3\u3067\u300cv-lazy-loading\u300d\u304c\u4f7f\u3046\u95a2\u6570\u3092\u3064\u304f\u308b\u30fb\u30fb\u30fb\u2463<\/h1>\n
\u3053\u3053\u304c\u4e00\u756a\u30b3\u30fc\u30c9\u91cf\u304c\u591a\u3044\u3067\u3059\u304c\u3001\u5c11\u3057\u8907\u96d1\u306a\u306e\u306f\u305f\u3063\u305f\uff11\u3064\u306e\u30e1\u30bd\u30c3\u30c9\u3060\u3051\u3067\u3059\u3002<\/p>\n
\u203b \u306a\u304a\u3001\u30df\u30c3\u30af\u30b9\u30a4\u30f3\u306fVue<\/code>\u306e\u57fa\u672c\u5f62\u3068\u5408\u4f53\u3059\u308b\u3053\u3068\u306b\u306a\u308a\u307e\u3059\u3002\uff08\u4f7f\u3044\u56de\u3057\u304c\u3067\u304d\u308b\u3088\u3046\u306b\u5225\u30b3\u30fc\u30c9\u306b\u5206\u3051\u307e\u3057\u305f\ud83d\ude0a\uff09<\/p>\n
Vue.mixin({\r\n    methods: {\r\n        lazyLoading() {<\/strong>\r\n\r\n            \/\/ \u30a6\u30a3\u30f3\u30c9\u30a6\u306e\u8868\u793a\u4f4d\u7f6e<\/strong>\r\n            const windowTop = window.scrollY;<\/strong>\r\n            const windowBottom = windowTop + window.innerHeight;<\/strong>\r\n\r\n            \/\/ Lazy Loading\u3059\u3079\u304d\u753b\u50cf\u3092\u5168\u3066\u53d6\u5f97<\/strong>\r\n            const images = document.querySelectorAll('.waiting-load');<\/strong>\r\n\r\n            [].forEach.call(images, el => {<\/strong>\r\n\r\n                \/\/ \u753b\u50cf\u306e\u4f4d\u7f6e<\/strong>\r\n                const offsetTop = el.offsetTop;<\/strong>\r\n                const offsetBottom = offsetTop + el.offsetHeight;<\/strong>\r\n\r\n                if(windowTop < offsetTop && windowBottom > offsetBottom) {<\/strong>\r\n\r\n                    \/\/ \u753b\u50cf\u3092\u30aa\u30ea\u30b8\u30ca\u30eb\u306eURL\u306b\u5909\u66f4\u3057\u3001\u4e0d\u8981\u306a\u30c7\u30fc\u30bf\u3092\u524a\u9664<\/strong>\r\n                    const originalSrc = el.getAttribute('original-src');<\/strong>\r\n                    el.setAttribute('src', originalSrc);<\/strong>\r\n                    el.removeAttribute('original-src');<\/strong>\r\n                    el.className = el.className.replace(' waiting-load', '');<\/strong>\r\n\r\n                    \/\/ lazy-load \u30a4\u30d9\u30f3\u30c8\u3092\u5b9f\u884c<\/strong>\r\n                    const event = new Event('lazy-load');<\/strong>\r\n                    el.dispatchEvent(event);<\/strong>\r\n\r\n                }<\/strong>\r\n\r\n            });<\/strong>\r\n\r\n        }<\/strong>\r\n    },\r\n    mounted() {\r\n\r\n        this.lazyLoading();<\/strong>\r\n        window.onscroll = this.lazyLoading;<\/strong>\r\n\r\n    }\r\n});<\/pre>\n
\u307e\u305a\u3001mounted()<\/code>\u306f\u30da\u30fc\u30b8\u304c\u8aad\u307f\u8fbc\u307e\u308c\u305f\u3089\u3059\u3050\u306b\u5b9f\u884c\u3055\u308c\u308b\u30e1\u30bd\u30c3\u30c9\u3067\u3059\u304c\u3001\u3053\u306e\u4e2d\u3067\u306flazyLoading()<\/code>\u3068\u3044\u3046\u30e1\u30bd\u30c3\u30c9\u3092\u3059\u3050\u306b\u5b9f\u884c\u3057\u3001\u3055\u3089\u306b\u30b9\u30af\u30ed\u30fc\u30eb\u3057\u305f\u3068\u304d\u306b\u3082\u540c\u3058\u30e1\u30bd\u30c3\u30c9\u3092\u5b9f\u884c\u3059\u308b\u3088\u3046\u30a4\u30d9\u30f3\u30c8\u3092\u3064\u3051\u3066\u3044\u307e\u3059\u3002<\/p>\n
\u203b \u4e00\u5ea6\u3059\u3050\u306b\u5b9f\u884c\u3057\u3066\u3044\u308b\u306e\u306f\u3001\u30da\u30fc\u30b8\u304c\u8868\u793a\u3055\u308c\u305f\u6642\u70b9\u3067\u753b\u50cf\u304c\u30a6\u30a3\u30f3\u30c9\u30a6\u5185\u306b\u5165\u3063\u3066\u3044\u308c\u3070\u30aa\u30ea\u30b8\u30ca\u30eb\u753b\u50cf\u3092\u8aad\u307f\u8fbc\u307e\u305b\u308b\u305f\u3081\u3067\u3059\u3002<\/p>\n
\u3067\u306f\u3001\u7d9a\u3044\u3066lazyLoading()<\/code>\u3067\u3059\u3002<\/p>\n
\u3053\u306e\u4e2d\u3067\u306f\u307e\u305a\u73fe\u5728\u306e\u30b9\u30af\u30ed\u30fc\u30eb\u4f4d\u7f6e\u3092\u53d6\u5f97\u3057\u3066\u3044\u307e\u3059\u3002\uff08\u3053\u306e\u6570\u5024\u3092\u898b\u308c\u3070\u3001\u30a6\u30a3\u30f3\u30c9\u30a6\u306e\u4e0a\u3068\u4e0b\u306e\u4f4d\u7f6e\u3001\u3064\u307e\u308a\u73fe\u5728\u30d6\u30e9\u30a6\u30b6\u3067\u8868\u793a\u3055\u308c\u3066\u3044\u308b\u7bc4\u56f2\u304c\u308f\u304b\u3088\u3046\u306b\u306a\u308a\u307e\u3059\uff09<\/p>\n
\u6b21\u306b\u3001document.querySelectorAll()<\/code>\u3092\u4f7f\u3063\u3066\u300cLazy Loading\u3092\u5b9f\u884c\u3059\u308b\u3079\u304d\u5168\u3066\u306e\u753b\u50cf\u300d<\/strong>\u3092\u53d6\u5f97\u3057\u3001\u305d\u308c\u3089\u3092[].forEach.call()<\/code>\u3067\u30eb\u30fc\u30d7\u3055\u305b\u3066\u3044\u307e\u3059\u3002<\/p>\n
\u305d\u3057\u3066\u30eb\u30fc\u30d7\u306e\u4e2d\u3067\u306f\u3001\uff11\u3064\u305a\u3064\u753b\u50cf\u306e\u30a8\u30ec\u30e1\u30f3\u30c8\u304c\u53d6\u5f97\u3067\u304d\u308b\u306e\u3067\u3001\u305d\u306e\u753b\u50cf\u306e\u4f4d\u7f6e\u3068\u5148\u307b\u3069\u306e\u30a6\u30a3\u30f3\u30c9\u30a6\u4f4d\u7f6e\u3092\u6bd4\u8f03\u3057\u30a6\u30a3\u30f3\u30c9\u30a6\u5185\u306b\u753b\u50cf\u304c\u5165\u3063\u3066\u3044\u308b\u304b\u3092\u30c1\u30a7\u30c3\u30af\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n
\"\"<\/p>\n
\u3082\u3057\u30a6\u30a3\u30f3\u30c9\u30a6\u5185\u306b\u5165\u3063\u3066\u3044\u308b\u3088\u3046\u306a\u3089\u3001\u4e00\u6642\u7684\u306b\u4fdd\u7ba1\u3057\u305f\u30aa\u30ea\u30b8\u30ca\u30eb\u753b\u50cf\u306eURL\u3092original-src<\/code>\u304b\u3089\u53d6\u5f97\u3057\u3001\u5b9f\u969b\u306b\u8868\u793a\u3055\u308c\u308bsrc<\/code>\u3068\u3057\u3066\u4f7f\u3044\u307e\u3059\u3002<\/p>\n
\u306a\u304a\u3001original-src<\/code>\u3068waiting-load<\/code>\u306f\u3082\u3046\u4e0d\u8981\u306a\u306e\u3067\u3053\u3053\u3067\u524a\u9664\u3057\u3066\u304a\u304d\u307e\u3059\u3002\uff08\u3068\u3044\u3046\u304b\u3001\u30af\u30e9\u30b9\u540dwaiting-load<\/code>\u306f\u524a\u9664\u3057\u306a\u3044\u3068\u4f55\u5ea6\u3082\u4f55\u5ea6\u3082\u51e6\u7406\u304c\u5b9f\u884c\u3055\u308c\u308b\u306e\u3067\u524a\u9664\u3057\u3066\u304a\u304f\u3079\u304d\u3067\u3059\uff09<\/p>\n
\u305d\u3057\u3066\u3001\u6700\u5f8c\u306bLazy Loading<\/code>\u3055\u308c\u305f\u3068\u304d\u306b\u5b9f\u884c\u3055\u308c\u308b\u30a4\u30d9\u30f3\u30c8\u3092\u8d77\u52d5\u3057\u307e\u3059\u3002\u30a4\u30d9\u30f3\u30c8\u540d\u306f\u3069\u3093\u306a\u3082\u306e\u3067\u3082\u3044\u3044\u306e\u3067\u304a\u597d\u307f\u3067\u5909\u66f4\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n
\u753b\u50cf\u30bf\u30b0\u3092\u3064\u304f\u308b\u30fb\u30fb\u30fb\u2464<\/h1>\n
\u3055\u3041\u3001\u5b8c\u6210\u304c\u8fd1\u3065\u3044\u3066\u304d\u307e\u3057\u305f\u3002
\n\u5b9f\u969b\u306b\u753b\u50cf\u30bf\u30b0\u3092\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u30bb\u30c3\u30c8\u3057\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n
<img<\/strong>\r\n    src=\"https:\/\/via.placeholder.com\/50?text=50x50\"<\/strong>\r\n    v-lazy-loading=\"'https:\/\/via.placeholder.com\/300?text=300x300'\"<\/strong>\r\n    @lazy-load=\"onLazyLoad\"><\/strong>\r\n<br><br><\/pre>\n
\u3059\u3067\u306b\u8aac\u660e\u3057\u307e\u3057\u305f\u304c\u3001\u30d7\u30ed\u30d1\u30c6\u30a3\u306e\u610f\u5473\u306f\u4ee5\u4e0b\u306e\u3068\u304a\u308a\u3067\u3059\u3002<\/p>\n