{"id":335,"date":"2024-11-01T13:00:16","date_gmt":"2024-11-01T05:00:16","guid":{"rendered":"https:\/\/womeifei.cn\/?p=335"},"modified":"2024-11-01T13:00:16","modified_gmt":"2024-11-01T05:00:16","slug":"javascript%e5%85%a5%e9%97%a8day04","status":"publish","type":"post","link":"https:\/\/womeifei.cn\/index.php\/2024\/11\/01\/javascript%e5%85%a5%e9%97%a8day04\/","title":{"rendered":"JavaScript\u5165\u95e8Day04"},"content":{"rendered":"\n<p>\u4eca\u5929\u4e3b\u8981\u5b66\u4e60\u4e86<strong>&#8220;\u5bf9\u8c61&#8221;<\/strong>\u8fd9\u4e00\u6570\u636e\u7c7b\u578b \u662f\u65e0\u5e8f\u7684\u6570\u636e\u7684\u96c6\u5408 \u7528\u4e8e\u8868\u793a\u67d0\u4e2a\u4e8b\u7269<\/p>\n\n\n\n<p>\u611f\u89c9\u8fd9\u4e2a\u6570\u636e\u7c7b\u578b\u8fd8\u662f\u6bd4\u8f83\u7b80\u5355\u7684<\/p>\n\n\n\n<p>\u7ed3\u6784\u7c7b\u4f3c\u4e8eC\u8bed\u8a00\u91cc\u9762\u7684\u7ed3\u6784\u4f53 \u4e5f\u6709\u70b9\u50cfPython\u91cc\u9762\u7684\u5b57\u5178<\/p>\n\n\n\n<p><\/p>\n\n\n\n<p class=\"has-large-font-size\">\u4e00.\u58f0\u660e <\/p>\n\n\n\n<p>\u5c5e\u6027\u540d:\u5185\u5bb9,<\/p>\n\n\n\n<figure class=\"wp-block-image size-full is-resized\"><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='https:\/\/womeifei.cn\/wp-content\/uploads\/2024\/10\/image-128.png'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  loading=\"lazy\" decoding=\"async\" width=\"303\" height=\"133\" data-original=\"https:\/\/womeifei.cn\/wp-content\/uploads\/2024\/10\/image-128.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"\" class=\"wp-image-336\" style=\"width:524px;height:auto\"  sizes=\"auto, (max-width: 303px) 100vw, 303px\" \/><\/div><\/figure>\n\n\n\n<p>\u7528<strong>\u70b9(.)<\/strong>\u8c03\u7528\u5bf9\u8c61\u5185\u90e8\u7684\u6210\u5458<\/p>\n\n\n\n<p>\u4e5f\u53ef\u4ee5\u7528<strong>obj[\u5c5e\u6027\u540d&#8221;]<\/strong>\u6765\u8c03\u7528<\/p>\n\n\n\n<p>\u8fd9\u4e24\u79cd\u65b9\u6cd5\u5404\u6709\u4f7f\u7528\u573a\u666f<\/p>\n\n\n\n<p><strong>\u53ef\u4ee5\u7528delete obj.\u5c5e\u6027\u540d \u5220\u9664\u4e00\u4e2a\u5bf9\u8c61\u5c5e\u6027<\/strong><\/p>\n\n\n\n<p><strong>\u5728\u5bf9\u8c61\u4e2d\u4e5f\u53ef\u4ee5\u58f0\u660e\u65b9\u6cd5<\/strong> \u5982\u4e0b\u56fe<\/p>\n\n\n\n<figure class=\"wp-block-image size-full is-resized\"><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='https:\/\/womeifei.cn\/wp-content\/uploads\/2024\/10\/image-129.png'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  loading=\"lazy\" decoding=\"async\" width=\"432\" height=\"210\" data-original=\"https:\/\/womeifei.cn\/wp-content\/uploads\/2024\/10\/image-129.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"\" class=\"wp-image-337\" style=\"width:535px;height:auto\"  sizes=\"auto, (max-width: 432px) 100vw, 432px\" \/><\/div><\/figure>\n\n\n\n<p class=\"has-large-font-size\">\u4e8c.\u904d\u5386<\/p>\n\n\n\n<p><strong>for in \u904d\u5386\u65b9\u6cd5<\/strong> (<mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-accent-3-color\"><strong>\u8fd4\u56de\u7684\u662f\u5b57\u7b26\u4e32!!!<\/strong><\/mark>)<\/p>\n\n\n\n<p><\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='https:\/\/womeifei.cn\/wp-content\/uploads\/2024\/10\/image-130.png'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  loading=\"lazy\" decoding=\"async\" width=\"577\" height=\"183\" data-original=\"https:\/\/womeifei.cn\/wp-content\/uploads\/2024\/10\/image-130.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"\" class=\"wp-image-338\"  sizes=\"auto, (max-width: 577px) 100vw, 577px\" \/><\/div><\/figure>\n\n\n\n<p>\u4e0d\u63a8\u8350\u7528\u8fd9\u79cd\u65b9\u5f0f\u904d\u5386\u6570\u7ec4(\u8fd4\u56de\u5b57\u7b26\u4e32) \u4f46\u662f\u53ef\u4ee5\u7528\u8fd9\u79cd\u65b9\u5f0f\u904d\u5386\u5bf9\u8c61<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='https:\/\/womeifei.cn\/wp-content\/uploads\/2024\/10\/image-131.png'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  loading=\"lazy\" decoding=\"async\" width=\"585\" height=\"282\" data-original=\"https:\/\/womeifei.cn\/wp-content\/uploads\/2024\/10\/image-131.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"\" class=\"wp-image-339\"  sizes=\"auto, (max-width: 585px) 100vw, 585px\" \/><\/div><\/figure>\n\n\n\n<p><strong>\u8fd9\u91cc\u7684k\u662f\u4ee3\u8868\u5c5e\u6027\u540d\u7684\u5b57\u7b26\u4e32 \u518d\u4f7f\u7528\u524d\u9762\u63d0\u5230\u7684obj[&#8216;\u5c5e\u6027\u540d&#8217;]\u8c03\u7528\u65b9\u6cd5\u521a\u597d\u53ef\u4ee5\u5f97\u5230\u5bf9\u8c61\u7684\u76f8\u5173\u5c5e\u6027\u5185\u5bb9!!!<\/strong><\/p>\n\n\n\n<p>\u4f8b:\u4e2a\u4eba\u4fe1\u606f\u8868\u683c\u6e32\u67d3<\/p>\n\n\n\n<p>\u6570\u636e\u51c6\u5907:<strong>\u7528\u6570\u7ec4\u5b58\u653e\u591a\u4e2a\u5bf9\u8c61\u4fe1\u606f<\/strong><\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='https:\/\/womeifei.cn\/wp-content\/uploads\/2024\/11\/image.png'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  loading=\"lazy\" decoding=\"async\" width=\"730\" height=\"237\" data-original=\"https:\/\/womeifei.cn\/wp-content\/uploads\/2024\/11\/image.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"\" class=\"wp-image-340\"  sizes=\"auto, (max-width: 730px) 100vw, 730px\" \/><\/div><\/figure>\n\n\n\n<p>\u6e32\u67d3\u9875\u9762:<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='https:\/\/womeifei.cn\/wp-content\/uploads\/2024\/11\/image-1.png'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  loading=\"lazy\" decoding=\"async\" width=\"579\" height=\"292\" data-original=\"https:\/\/womeifei.cn\/wp-content\/uploads\/2024\/11\/image-1.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"\" class=\"wp-image-341\"  sizes=\"auto, (max-width: 579px) 100vw, 579px\" \/><\/div><\/figure>\n\n\n\n<p>\u6548\u679c\u5982\u56fe<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='https:\/\/womeifei.cn\/wp-content\/uploads\/2024\/11\/image-2-1024x478.png'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"478\" data-original=\"https:\/\/womeifei.cn\/wp-content\/uploads\/2024\/11\/image-2-1024x478.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"\" class=\"wp-image-342\"  sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/div><\/figure>\n\n\n\n<p class=\"has-large-font-size\">\u4e09.\u7a7a\u5bf9\u8c61<\/p>\n\n\n\n<p><strong>let obj=null\u8868\u793a\u4e00\u4e2a\u7a7a\u5bf9\u8c61<\/strong><\/p>\n\n\n\n<p class=\"has-large-font-size\">\u56db.\u5185\u7f6e\u5bf9\u8c61 <\/p>\n\n\n\n<p>JavaScript\u5185\u90e8\u63d0\u4f9b\u7684\u5bf9\u8c61 \u5305\u542b\u5404\u79cd\u5c5e\u6027\u548c\u65b9\u6cd5\u7ed9\u5f00\u53d1\u8005\u4f7f\u7528<\/p>\n\n\n\n<p><strong>\u53ef\u4ee5\u53bbMDN\u67e5\u9605\u76f8\u5173\u5c5e\u6027\u65b9\u6cd5<\/strong><\/p>\n\n\n\n<p>\u5e38\u7528\u5185\u7f6e\u5bf9\u8c61\u4e3a<strong>Math\u5bf9\u8c61<\/strong> \u4e0b\u9762\u662f\u5b83\u7684\u4e00\u4e9b\u5e38\u7528\u5c5e\u6027\u548c\u65b9\u6cd5<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='https:\/\/womeifei.cn\/wp-content\/uploads\/2024\/11\/image-3.png'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  loading=\"lazy\" decoding=\"async\" width=\"588\" height=\"250\" data-original=\"https:\/\/womeifei.cn\/wp-content\/uploads\/2024\/11\/image-3.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"\" class=\"wp-image-343\"  sizes=\"auto, (max-width: 588px) 100vw, 588px\" \/><\/div><\/figure>\n\n\n\n<p>\u6211\u5e76\u4e0d\u591a\u8bf4\u4ec0\u4e48<\/p>\n\n\n\n<p><strong>Math\u5bf9\u8c61\u6700\u91cd\u8981\u7684\u5e94\u7528\u662frandom\u968f\u673a\u6570\u751f\u6210\u65b9\u6cd5<\/strong><\/p>\n\n\n\n<p>\u8fd9\u4e2a\u65b9\u6cd5\u968f\u673a\u4ea7\u751f\u4e00\u4e2a<strong>[0,1)<\/strong>\u4e4b\u95f4\u7684\u5c0f\u6570<\/p>\n\n\n\n<p>\u4e0b\u9762\u662f\u751f\u6210N-M\u4e4b\u95f4\u7684\u968f\u673a\u6570\u51fd\u6570<\/p>\n\n\n\n<figure class=\"wp-block-image size-full is-resized\"><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='https:\/\/womeifei.cn\/wp-content\/uploads\/2024\/11\/image-4.png'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  loading=\"lazy\" decoding=\"async\" width=\"595\" height=\"123\" data-original=\"https:\/\/womeifei.cn\/wp-content\/uploads\/2024\/11\/image-4.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"\" class=\"wp-image-344\" style=\"width:535px;height:auto\"  sizes=\"auto, (max-width: 595px) 100vw, 595px\" \/><\/div><\/figure>\n\n\n\n<p><strong>*(M-N+1) &#8212; > \u751f\u6210 0&#8211;(M-N)\u4e4b\u95f4\u7684\u6570 <\/strong><\/p>\n\n\n\n<p><strong>+N &#8212; > \u751f\u6210N&#8211;M\u4e4b\u95f4\u7684\u6570<\/strong><\/p>\n\n\n\n<p>\u4e0b\u9762\u662f\u5229\u7528\u968f\u673a\u6570\u968f\u673a\u751f\u6210\u989c\u8272(<strong>\u7528rgb\u548c\u5341\u516d\u8fdb\u5236\u4e24\u79cd\u65b9\u6cd5\u751f\u6210<\/strong>)\u7684\u6848\u4f8b \u5f88\u6709\u610f\u601d\u554a!!!<\/p>\n\n\n\n<figure class=\"wp-block-video\"><video height=\"1526\" style=\"aspect-ratio: 1280 \/ 1526;\" width=\"1280\" controls src=\"https:\/\/womeifei.cn\/wp-content\/uploads\/2024\/11\/\u5c4f\u5e55\u5f55\u5236-2024-11-01-124804.mp4\"><\/video><\/figure>\n\n\n\n<p class=\"has-large-font-size\">\u4e94.\u503c\u7c7b\u578b\u548c\u5f15\u7528\u7c7b\u578b<\/p>\n\n\n\n<p>\u6570\u636e\u7c7b\u578b\u5206\u4e3a\u503c\u7c7b\u578b\u548c\u5f15\u7528\u7c7b\u578b<\/p>\n\n\n\n<p><strong>\u503c\u7c7b\u578b<\/strong>&#8212; ><em>\u7b80\u5355\u6570\u636e\u7c7b\u578b\/\u57fa\u672c\u6570\u636e\u7c7b\u578b\uff0c\u5728\u5b58\u50a8\u65f6\u53d8\u91cf\u4e2d\u5b58\u50a8\u7684\u662f\u503c\u672c\u8eab\uff0c\u56e0\u6b64\u53eb\u505a\u503c\u7c7b\u578b string ,number, boolean, undefined, null<\/em>&#8230;&#8230;\u90fd\u662f\u503c\u7c7b\u578b<\/p>\n\n\n\n<p><strong>\u5f15\u7528\u7c7b\u578b<\/strong>&#8212; ><em>\u590d\u6742\u6570\u636e\u7c7b\u578b\uff0c\u5728\u5b58\u50a8\u65f6\u53d8\u91cf\u4e2d<strong>\u5b58\u50a8\u7684\u4ec5\u4ec5\u662f\u5730\u5740(\u5f15\u7528)<\/strong>\uff0c\u56e0\u6b64\u53eb\u505a\u5f15\u7528\u6570\u636e\u7c7b\u578b,\u901a\u8fc7 new \u5173\u952e\u5b57\u521b\u5efa\u7684\u5bf9\u8c61(\u7cfb\u7edf\u5bf9\u8c61\u3001\u81ea\u5b9a\u4e49\u5bf9\u8c61)\uff0c\u5982 0bject\u3001Array\u3001Date\u7b49<\/em><\/p>\n\n\n\n<p><strong>\u7b80\u5355\u6570\u636e\u7c7b\u578b\u5b58\u653e\u5230\u6808\u91cc\u9762<\/strong><\/p>\n\n\n\n<p><strong>\u5f15\u7528\u6570\u636e\u7c7b\u578b\u5b58\u653e\u5728\u5806\u91cc\u9762<\/strong><\/p>\n\n\n\n<p>\u56fe\u793a\u5982\u4e0b<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='https:\/\/womeifei.cn\/wp-content\/uploads\/2024\/11\/420e503870c4ba1901a7d5fc882f376.png'><img class=\"lazyload lazyload-style-1\" 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