{"id":523,"date":"2021-03-20T12:42:00","date_gmt":"2021-03-20T04:42:00","guid":{"rendered":"https:\/\/fireinsect.top\/?p=523"},"modified":"2021-03-27T12:30:46","modified_gmt":"2021-03-27T04:30:46","slug":"javascript%e5%9f%ba%e7%a1%80%e8%ae%a4%e8%af%86","status":"publish","type":"post","link":"https:\/\/fireinsect.top\/index.php\/2021\/03\/20\/javascript%e5%9f%ba%e7%a1%80%e8%ae%a4%e8%af%86\/","title":{"rendered":"JavaScript\u57fa\u7840\u8ba4\u8bc6"},"content":{"rendered":"\n<p>JavaScript\u662f\u4e00\u79cd\u4e13\u4e3a\u7f51\u9875\u4ea4\u4e92\u800c\u8bbe\u8ba1\u7684\u811a\u672c\u8bed\u8a00<\/p>\n\n\n\n<p>\u5176\u4e3b\u8981\u5206\u4e3a\u4e09\u4e2a\u90e8\u5206<\/p>\n\n\n\n<ol class=\"wp-block-list\"><li>\u6838\u5fc3(ECMAScript)<\/li><li>\u6587\u6863\u5bf9\u8c61\u6a21\u578b(DOM)<\/li><li>\u6d4f\u89c8\u5668\u5bf9\u8c61\u6a21\u578b(BOM)<\/li><\/ol>\n\n\n\n<!--more-->\n\n\n\n<p>\u6838\u5fc3(ECMAScript)\u89c4\u5b9a\u4e86\u8fd9\u95e8\u8bed\u8a00\u7684\u57fa\u672c\u7ec4\u6210\u5982\uff1a<\/p>\n\n\n\n<ul class=\"list1 wp-block-list\"><li>\u8bed\u6cd5<\/li><li>\u7c7b\u578b<\/li><li>\u8bed\u53e5<\/li><li>\u5173\u952e\u5b57<\/li><li>\u4fdd\u7559\u5b57<\/li><li>\u64cd\u4f5c\u7b26<\/li><li>\u5bf9\u8c61<\/li><\/ul>\n\n\n\n<div style=\"height:81px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<p>\u6587\u6863\u5bf9\u8c61\u6a21\u578b(DOM)\u4f5c\u7528\u4e8e\u83b7\u53d6\u6240\u5199\u7684\u6240\u6709HTML\u6807\u7b7e\uff0c\u5e76\u7ed9\u6807\u7b7e\u6dfb\u52a0\u6216\u8005\u5220\u9664\u6837\u5f0f\uff0c\u5e76\u53ef\u4ee5\u7ed9\u6807\u7b7e\u6dfb\u52a0\u4e8b\u4ef6(\u4f8b\u5982\u70b9\u51fb\u3001\u62d6\u52a8\u7b49)\u3002<\/p>\n\n\n\n<p>\u8fd9\u4e9b\u529f\u80fd\u7684\u5b9e\u73b0\u662f\u57fa\u4e8e\u4e0b\u9762\u51e0\u79cd\u63a5\u53e3\uff1a<\/p>\n\n\n\n<ul class=\"list1 wp-block-list\"><li>DOM \u904d\u5386\u548c\u8303\u56f4\uff1a \u53ef\u4ee5\u627e\u5230\u9875\u9762\u4e2d\u6240\u6709\u7684\u6807\u7b7e;<\/li><li>DOM \u4e8b\u4ef6\uff1a \u4f8b\u5982\u7ed9\u67d0\u4e2a\u56fe\u7247\u6dfb\u52a0\u62d6\u52a8\u4e8b\u4ef6\uff0c\u4f7f\u56fe\u7247\u53ef\u4ee5\u968f\u610f\u62d6\u52a8;<\/li><li>DOM \u6837\u5f0f\uff1a \u53ef\u4ee5\u66f4\u6539\u9875\u9762\u4e2d\u6240\u6709\u5143\u7d20\u7684\u6837\u5f0f\uff0c\u4f8b\u5982\u66f4\u6539\u67d0\u4e00\u6bb5\u6587\u5b57\u7684\u989c\u8272\u3002<\/li><\/ul>\n\n\n\n<div style=\"height:69px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<p>\u6d4f\u89c8\u5668\u5bf9\u8c61\u6a21\u578b(BOM)\u53ea\u4f1a\u5904\u7406\u8ddf\u6d4f\u89c8\u5668\u76f8\u5173\u7684\u4e1c\u897f\uff0c\u5982\uff1a<\/p>\n\n\n\n<ul class=\"list1 wp-block-list\"><li>\u5f39\u51fa\u65b0\u7a97\u53e3\u529f\u80fd<\/li><li>\u79fb\u52a8\u3001\u7f29\u653e\u3001\u5173\u95ed\u6d4f\u89c8\u5668\u7a97\u53e3\u7684\u529f\u80fd<\/li><li>\u7ed9\u7528\u6237\u63d0\u4f9b\u663e\u793a\u5668\u5206\u8fa8\u7387\u7684\u529f\u80fd<\/li><li>\u63d0\u4f9b\u6d4f\u89c8\u5668\u4fe1\u606f<\/li><\/ul>\n\n\n\n<p style=\"font-size:25px\"><a rel=\"noreferrer noopener\" href=\"https:\/\/fireinsect.top\/index.php\/2021\/03\/20\/javascript%e7%9a%84%e4%b9%a6%e5%86%99%e6%96%b9%e5%bc%8f\/\" target=\"_blank\"><span class=\"has-inline-color has-vivid-cyan-blue-color\">JavaScript\u7684\u4e66\u5199\u65b9\u5f0f<\/span><\/a><\/p>\n\n\n\n<p>JavaScript\u4e0eCSS\u4e0d\u540c\u7684\u662f\u5b83\u7684\u8f93\u51fa\u7ed3\u679c\u4e0d\u662f\u5728\u6d4f\u89c8\u5668\u9875\u9762\u4e2d\u663e\u793a\uff0c\u800c\u662f\u5728\u63a7\u5236\u53f0\u4e2d\u663e\u793a\uff0c<\/p>\n\n\n\n<p><code>console<\/code>\u8868\u793a\u8bbf\u95ee\u63a7\u5236\u53f0\uff0c<code>log()<\/code>\u8868\u793a\u5728\u63a7\u5236\u53f0\u8f93\u51fa\u4fe1\u606f\uff0c<code>console.log('\u8f93\u51fa\u7684\u5185\u5bb9')<\/code>\u5c31\u662f\u5728\u63a7\u5236\u53f0\u8f93\u51fa\u5185\u5bb9\u4e86\u3002<\/p>\n\n\n\n<p>\u5728JavaScript\u4e2d\u7533\u660e\u53d8\u91cf\u4e00\u822c\u4f7f\u7528 <code>let<\/code>\u548cconst<\/p>\n\n\n\n<p>ps\uff1aconst\u662f\u56fa\u5b9a\u53d8\u91cf\uff0c\u4e0d\u80fd\u518d\u6b21\u8d4b\u503c\uff0c\u4e14\u5fc5\u987b\u62e5\u6709\u521d\u59cb\u503c<\/p>\n\n\n\n<p>\u5982 <code>let str =\u2018\u6211\u5728\u5b66JavaScript\u2019<\/code>\u8fd9\u91cc\u4f7f\u7528\u53cc\u5f15\u53f7\u548c\u5355\u5f15\u53f7\u90fd\u53ef\u4ee5\uff0c\u90fd\u8868\u793a\u7533\u660e\u4e00\u4e2a\u5b57\u7b26\u4e32\u3002<\/p>\n\n\n\n<p>\u5728\u7533\u660e\u4e2d \u6211\u4eec\u53ef\u4ee5\u8fdb\u884c\u5b57\u7b26\u4e32\u8fde\u63a5\u5982\uff1a<\/p>\n\n\n\n<p><code>let say = \u2018\u5927\u5bb6\u597d\u2019 + str +\u2018\u6211\u5f88\u5feb\u4e50\u2019;<\/code><\/p>\n\n\n\n<p>\u9664\u4e86\u8fd9\u79cd\u8fde\u63a5\u65b9\u6cd5\uff0c\u6211\u4eec\u53ef\u4ee5\u5229\u7528 \u53cd\u5f15\u53f7&#8220; \u6765\u8868\u793a\u6a21\u677f\u5b57\u7b26\u4e32<\/p>\n\n\n\n<p>\u5176\u4e2d\u6211\u4eec\u9700\u8981\u77e5\u9053\u5360\u4f4d\u7b26\\${expression}<\/p>\n\n\n\n<p>\u5373 <code>let say = `\u5927\u5bb6\u597d\uff0c\u6211${str},\u6211\u5f88\u5feb\u4e50`<\/code><\/p>\n\n\n\n<p>\u5f53\u7136 \u5982\u679c\u60f3\u5728JavaScript\u5b57\u7b26\u4e32\u91cc\u6253\u51fa\u5982\u53cc\u5f15\u53f7\u548c\u5355\u5f15\u53f7\uff0c\u53ef\u4ee5\u4f7f\u7528\u8f6c\u4e49\u7b26 \\ <\/p>\n\n\n\n<p>\u5177\u4f53\u53c2\u8003C\u8bed\u8a00\u7684\u8f6c\u4e49\u7b26\u3002<\/p>\n\n\n\n<p>\u5982\u679c\u591a\u884c\u5b57\u7b26\u4e32\u62fc\u63a5\uff0c\u5982\u62fc\u63a5\u4e00\u9996\u8bd7\uff0c\u53ef\u4ee5\u5982\u4e0b<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code lang=\"javascript\" class=\"language-javascript\"><strong>let<\/strong> str = '\u6625\u7720\u4e0d\u89c9\u6653\\n' + '\u5904\u5904\u95fb\u557c\u9e1f\\n' + '\u591c\u6765\u98ce\u96e8\u58f0\\n' + '\u82b1\u843d\u77e5\u591a\u5c11\\n';\nconsole.log(str);<\/code><\/pre>\n\n\n\n<p>\u800c\u4f7f\u7528\u6a21\u677f\u5b57\u7b26\u4e32\u53ea\u9700\u8981\u6572\u56de\u8f66\u5c31\u884c<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code lang=\"javascript\" class=\"language-javascript\"><strong>let<\/strong> str = `\u6625\u7720\u4e0d\u89c9\u6653\n\u5904\u5904\u95fb\u557c\u9e1f\n\u591c\u6765\u98ce\u96e8\u58f0\n\u82b1\u843d\u77e5\u591a\u5c11`;\n\nconsole.log(str);<\/code><\/pre>\n\n\n\n<p>\u5f53\u7136\u5360\u4f4d\u7b26\u4e2d\u53ef\u4ee5\u4f7f\u7528\u4e00\u4e9b\u8868\u8fbe\u5f0f \u5982<code>${number1 - number2}<\/code><\/p>\n\n\n\n<p>\u901a\u8fc7\u7c7b\u4f3c\u6b64\u65b9\u6cd5\uff0c\u53ef\u4ee5\u7b80\u5316\u5b57\u7b26\u4e32\u62fc\u63a5\uff0c\u51cf\u5c11\u52a0\u53f7\u548c\u5f15\u53f7\u7684\u4f7f\u7528\u3002<\/p>\n\n\n\n<p><strong><kbd>\u6a21\u677f<\/kbd><\/strong>\u5b57\u7b26\u4e32\uff0c\u4e5f\u652f\u6301\u4e09\u5143\u8868\u8fbe\u5f0f\u5982\uff1a<\/p>\n\n\n\n<p><code>${false ? '\u5357\u4eac'\uff1a\u2018\u6c5f\u82cf\u2019}<\/code>\u7b49\u7b49<\/p>\n\n\n\n<p style=\"font-size:25px\">\u6570\u7ec4\u5143\u7d20\u64cd\u4f5c(\u589e\/\u5220\/\u6539\/\u67e5)<\/p>\n\n\n\n<p class=\"has-medium-font-size\">\u6570\u7ec4\u5143\u7d20\u64cd\u4f5c \u589e\uff1a<\/p>\n\n\n\n<p><code>\u53d8\u91cf\u540d.push('\u8981\u6dfb\u52a0\u7684\u503c');<\/code> \u5728\u6570\u7ec4\u672b\u5c3e\u6dfb\u52a0\u65b0\u7684\u5143\u7d20\u3002<\/p>\n\n\n\n<p><code>\u53d8\u91cf\u540d.unshift('\u8981\u6dfb\u52a0\u7684\u503c');<\/code> \u5728\u6570\u7ec4\u5f00\u5934\u6dfb\u52a0\u65b0\u7684\u5143\u7d20\u3002<\/p>\n\n\n\n<p class=\"has-medium-font-size\">\u6570\u7ec4\u5143\u7d20\u64cd\u4f5c \u5220\uff1a<\/p>\n\n\n\n<p><code>\u53d8\u91cf\u540d.pop();<\/code> \u5220\u9664\u6570\u7ec4\u672b\u5c3e\u4e00\u4e2a\u5143\u7d20\u3002<\/p>\n\n\n\n<p><code>\u53d8\u91cf\u540d.shift();<\/code> \u5220\u9664\u6570\u7ec4\u5f00\u5934\u4e00\u4e2a\u5143\u7d20\u3002<\/p>\n\n\n\n<p><code>\u53d8\u91cf\u540d.splice(n,b);<\/code> \u5220\u9664\u6570\u7ec4\u6307\u5b9a\u4f4d\u7f6e\u5143\u7d20\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code lang=\"javascript\" class=\"language-javascript\">\/\/splice \u540e\u63a5\u4e00\u4e2a\u53c2\u6570\n<strong>let<\/strong> schools = ['\u6e05\u534e\u5927\u5b66', '\u5317\u4eac\u5927\u5b66', '\u6d59\u6c5f\u5927\u5b66', '\u540c\u6d4e\u5927\u5b66'];\n\n<em>\/\/ \u5220\u9664\u4ece\u4e0b\u6807\u4e3a1\u7684\u4f4d\u7f6e\u5230\u7ed3\u675f\u4f4d\u7f6e\u7684\u503c<\/em>\n<strong>let<\/strong> deleteSchools = schools.splice(1);\n<em>\/\/ \u5220\u9664\u4e4b\u540e\uff0c\u539f\u6570\u7ec4\u4e2d\u7684\u5269\u4f59\u5185\u5bb9<\/em>\nconsole.log(schools); <em>\/\/ [\"\u6e05\u534e\u5927\u5b66\"]<\/em>\n<em>\/\/ \u5220\u9664\u7684\u5185\u5bb9<\/em>\nconsole.log(deleteSchools); <em>\/\/ [\"\u5317\u4eac\u5927\u5b66\", \"\u6d59\u6c5f\u5927\u5b66\", \"\u540c\u6d4e\u5927\u5b66\"]<\/em><\/code><\/pre>\n\n\n\n<pre class=\"wp-block-code\"><code lang=\"javascript\" class=\"language-javascript\">\/\/splice \u540e\u63a5\u4e24\u4e2a\u53c2\u6570\n<strong>let<\/strong> schools = ['\u6e05\u534e\u5927\u5b66', '\u5317\u4eac\u5927\u5b66', '\u6d59\u6c5f\u5927\u5b66', '\u540c\u6d4e\u5927\u5b66'];\n\n<em>\/\/ \u4ece\u4e0b\u6807\u4e3a0\u5f00\u59cb,\u5f80\u540e\u6570\u4e24\u4e2a\u5143\u7d20,\u5220\u9664<\/em>\n<strong>let<\/strong> deleteSchools = schools.splice(0, 2);\nconsole.log(schools); <em>\/\/ ['\u6d59\u6c5f\u5927\u5b66', '\u540c\u6d4e\u5927\u5b66']<\/em>\nconsole.log(deleteSchools); <em>\/\/ ['\u6e05\u534e\u5927\u5b66', '\u5317\u4eac\u5927\u5b66']<\/em><\/code><\/pre>\n\n\n\n<p class=\"has-medium-font-size\">\u6570\u7ec4\u5143\u7d20\u64cd\u4f5c \u6539\uff1a<\/p>\n\n\n\n<p>\u540c\u6837\u662f\u4f7f\u7528 .splice \u65b9\u6cd5\u6539\u53d8\u6307\u5b9a\u4f4d\u7f6e\u7684\u503c<\/p>\n\n\n\n<p>splice\u540e\u63a5\u4e0a\u4e09\u4e2a\u53c2\u6570<\/p>\n\n\n\n<ol class=\"wp-block-list\"><li>\u7b2c\u4e00\u4e2a\u503c,\u6574\u6570\u7c7b\u578b,\u8868\u793a\u8d77\u59cb\u4f4d\u7f6e<\/li><li>\u7b2c\u4e8c\u4e2a\u503c,\u6574\u6570\u7c7b\u578b,\u8868\u793a\u6b65\u957f(\u5f80\u540e\u9009\u51e0\u4e2a\u5143\u7d20,1 \u4ee3\u8868\u5f80\u540e\u9009 1 \u4e2a\u5143\u7d20)<\/li><li>\u7b2c\u4e09\u4e2a\u53c2\u6570,\u8981\u66ff\u6362\u7684\u6570\u7ec4\u7684\u503c<\/li><\/ol>\n\n\n\n<pre class=\"wp-block-code\"><code lang=\"javascript\" class=\"language-javascript\"><strong>let<\/strong> schools = ['\u6e05\u534e\u5927\u5b66', '\u5317\u4eac\u5927\u5b66', '\u6d59\u6c5f\u5927\u5b66', '\u540c\u6d4e\u5927\u5b66'];\n\nschools.splice(2, 0, '\u6c5f\u897f\u7406\u5de5\u5927\u5b66');\nconsole.log(schools); <em>\/\/  [\"\u6e05\u534e\u5927\u5b66\", \"\u5317\u4eac\u5927\u5b66\", \"\u6c5f\u897f\u7406\u5de5\u5927\u5b66\", \"\u6d59\u6c5f\u5927\u5b66\", \"\u540c\u6d4e\u5927\u5b66\"]<\/em>\n\/\/\u56e0\u4e3a\u7b2c\u4e8c\u4e2a\u53c2\u6570\u4e3a0\uff0c\u8868\u793a\u6b65\u957f\u4e3a0\uff0c\u6240\u4ee5\u663e\u793a\u7684\u6548\u679c\u4e3a\u6dfb\u52a0\u4e86\u4e00\u4e2a\u65b0\u7684\u5143\u7d20<\/code><\/pre>\n\n\n\n<p class=\"has-medium-font-size\">\u6570\u7ec4\u5143\u7d20\u64cd\u4f5c \u67e5\uff1a<\/p>\n\n\n\n<p><code>.indexOf()<\/code>\u65b9\u6cd5<\/p>\n\n\n\n<p>\u6b64\u65b9\u6cd5\u53ef\u4ee5\u5728\u540e\u9762\u5199\u4e24\u4e2a\u53c2\u6570\uff0c\u7b2c\u4e00\u4e2a\u4e3a\u5bfb\u627e\u7684\u503c\uff0c\u7b2c\u4e8c\u4e2a\u4e3a\u5f00\u59cb\u5bfb\u627e\u7684\u4f4d\u7f6e\u3002<\/p>\n\n\n\n<p style=\"font-size:25px\"><a href=\"https:\/\/fireinsect.top\/index.php\/2021\/03\/27\/javascript\u5b9a\u65f6\u5668\/\"><span class=\"has-inline-color has-vivid-cyan-blue-color\">|JavaScript\u5b9a\u65f6\u5668|<\/span><\/a><\/p>\n\n\n\n<p style=\"font-size:25px\">\u5185\u7f6e\u5bf9\u8c61Math<\/p>\n\n\n\n<p>\u8fd9\u4e9b\u5bf9\u8c61\u6bb5\u6211\u5355\u7eaf\u8bb0\u5f55\u4e00\u4e0b\u53ef\u80fd\u4f7f\u7528\u7684\u65b9\u6cd5\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code lang=\"javascript\" class=\"language-javascript\">Math.E <em>\/\/ \u5e38\u6570e\u3002<\/em>\nMath.LN2 <em>\/\/ 2 \u7684\u81ea\u7136\u5bf9\u6570\u3002<\/em>\nMath.LN10 <em>\/\/ 10 \u7684\u81ea\u7136\u5bf9\u6570\u3002<\/em>\nMath.LOG2E <em>\/\/ \u4ee5 2 \u4e3a\u5e95\u7684e\u7684\u5bf9\u6570\u3002<\/em>\nMath.LOG10E <em>\/\/ \u4ee5 10 \u4e3a\u5e95\u7684e\u7684\u5bf9\u6570\u3002<\/em>\nMath.PI <em>\/\/ \u5e38\u6570\u03c0\u3002<\/em>\nMath.SQRT1_2 <em>\/\/ 0.5 \u7684\u5e73\u65b9\u6839\u3002<\/em>\nMath.SQRT2 <em>\/\/ 2 \u7684\u5e73\u65b9\u6839\u3002<\/em><\/code><\/pre>\n\n\n\n<pre class=\"wp-block-code\"><code lang=\"javascript\" class=\"language-javascript\">Math.abs() <em>\/\/ \u7edd\u5bf9\u503c<\/em>\nMath.ceil() <em>\/\/ \u5411\u4e0a\u53d6\u6574<\/em> <em>\u53d6\u5927\u4e8e\u7b49\u4e8e x\uff0c\u5e76\u4e14\u4e0e\u5b83\u6700\u63a5\u8fd1\u7684\u6574\u6570\u3002<\/em>\nMath.floor() <em>\/\/ \u5411\u4e0b\u53d6\u6574<\/em> <em style=\"background-color: inherit; font-family: monospace; font-size: inherit;\">\u53d6\u5c0f\u4e8e\u7b49\u4e8e x\uff0c\u5e76\u4e14\u4e0e\u5b83\u6700\u63a5\u8fd1\u7684\u6574\u6570\u3002<\/em>\nMath.round() <em>\/\/ \u56db\u820d\u4e94\u5165\u53d6\u6574<\/em> <em style=\"background-color: inherit; font-family: monospace; font-size: inherit;\">\u53d6\u4e0e x \u6700\u63a5\u8fd1\u7684\u6574\u6570\u3002<\/em>\nMath.max() <em>\/\/ \u6700\u5927\u503c<\/em>\nMath.min() <em>\/\/ \u6700\u5c0f\u503c<\/em>\nMath.pow() <em>\/\/ \u6307\u6570\u8fd0\u7b97<\/em>\nMath.sqrt() <em>\/\/ \u5e73\u65b9\u6839<\/em>\nMath.log() <em>\/\/ \u81ea\u7136\u5bf9\u6570<\/em>\nMath.exp() <em>\/\/ e\u7684\u6307\u6570<\/em>\nMath.random() <em>\/\/ \u968f\u673a\u6570<\/em><\/code><\/pre>\n\n\n\n<p style=\"font-size:25px\">window.localStorage&#8212;-storage\u5bf9\u8c61<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code class=\"\">window.localStorage.setItem('myLocalStorage', 'storage Value');\/\/\u6d4f\u89c8\u5668\u4e2d\u5b58\u5165\u6570\u636e\n\u4ee5 key \u548c value \u8868\u793a<\/code><\/pre>\n\n\n\n<pre class=\"wp-block-code\"><code class=\"\">window.localStorage.getItem('myLocalStorage'); \/\/\u8bfb\u53d6\u6570\u636e\uff0c\u53c2\u6570\u4e3a key\u503c<\/code><\/pre>\n\n\n\n<pre class=\"wp-block-code\"><code class=\"\">window.localStorage.clear(); \/\/\u6e05\u7406\u7f13\u5b58<\/code><\/pre>\n\n\n\n<p style=\"font-size:25px\">string\u5bf9\u8c61<\/p>\n\n\n\n<p>\u4e0ejava\u76f8\u4f3c\uff0c\u5c31\u4e0d\u8bf4\u4e86\u3002\u3002\u3002\u3002<\/p>\n\n\n\n<p style=\"font-size:25px\">Array\u5bf9\u8c61<\/p>\n\n\n\n<p class=\"has-medium-font-size\">\u8fde\u63a5\u6570\u7ec4\uff1ajoin()<\/p>\n\n\n\n<p>join()\u65b9\u6cd5\u4ee5\u6307\u5b9a\u53c2\u6570\u4f5c\u4e3a\u5206\u9694\u7b26\uff0c\u5c06\u6240\u6709\u6570\u7ec4\u6210\u5458\u8fde\u63a5\u4e3a\u4e00\u4e2a\u5b57\u7b26\u4e32\u8fd4\u56de\u3002\u5982\u679c\u4e0d\u63d0\u4f9b\u53c2\u6570\uff0c\u9ed8\u8ba4<br>\u7528\u9017\u53f7\u5206\u9694\u3002<\/p>\n\n\n\n<p class=\"has-medium-font-size\">\u5012\u5e8f\u6392\u5217\uff1areverse()<\/p>\n\n\n\n<p>reverse\u65b9\u6cd5\u7528\u4e8e\u98a0\u5012\u6392\u5217\u6570\u7ec4\u5143\u7d20\uff0c\u8fd4\u56de\u6539\u53d8\u540e\u7684\u6570\u7ec4\u3002<\/p>\n\n\n\n<p class=\"has-medium-font-size\">\u6392\u5e8f\uff1asort()<\/p>\n\n\n\n<p>sort\u65b9\u6cd5\u5bf9\u6570\u7ec4\u6210\u5458\u8fdb\u884c\u6392\u5e8f\uff0c\u9ed8\u8ba4\u662f\u6309\u7167\u5b57\u5178\u987a\u5e8f\u6392\u5e8f\u3002\u5982\u679c\u60f3\u8ba9sort\u65b9\u6cd5\u6309\u7167\u81ea\u5b9a\u4e49\u65b9\u5f0f\u6392\u5e8f\uff0c<br>\u53ef\u4ee5\u4f20\u5165\u4e00\u4e2a\u51fd\u6570\u4f5c\u4e3a\u53c2\u6570\u3002<\/p>\n\n\n\n<p class=\"has-medium-font-size\"><strong>\u904d\u5386\uff1amap\/forEach<\/strong><\/p>\n\n\n\n<p>\u904d\u5386\u6570\u7ec4\u6211\u4eec\u4e4b\u524d\u7528\u7684\u662ffor\u5faa\u73af\uff0c\u4f46\u5176\u5b9e JavaScript \u4e3a\u6211\u4eec\u63d0\u4f9b\u4e86\u4e24\u4e2a\u5f88\u65b9\u4fbf\u7684\u904d\u5386\u65b9\u6cd5\uff1a<br>map \u548c forEach\u3002<\/p>\n\n\n\n<p style=\"font-size:18px\">\u6709\u8fd4\u56de\u503c\u7684\u904d\u5386\uff1amap<\/p>\n\n\n\n<p>\u5148\u770b map \u65b9\u6cd5\u7684\u4f7f\u7528\uff0c\u5b83\u63a5\u53d7\u4e00\u4e2a\u51fd\u6570\uff0c\u7136\u540e\u5c06\u6570\u7ec4\u7684\u6240\u6709\u6210\u5458\u4f9d\u6b21\u4f20\u5165\u8fd9\u4e2a\u53c2\u6570\u51fd\u6570\uff0c\u6700\u540e\u628a\u6bcf<br>\u4e00\u6b21\u7684\u6267\u884c\u7ed3\u679c\u7ec4\u6210\u4e00\u4e2a\u65b0\u6570\u7ec4\u8fd4\u56de.<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code lang=\"javascript\" class=\"language-javascript\"><strong>let<\/strong> arr = [\n  { name: 'jenny', age: 18 },\n  { name: 'tom', age: 10 },\n  { name: 'mary', age: 40 }\n];\n\n<em>\/\/ elem: \u6570\u7ec4\u6210\u5458<\/em>\n<em>\/\/ index: \u6210\u5458\u4e0b\u6807<\/em>\n<em>\/\/ a: \u6574\u4e2a\u6570\u7ec4<\/em>\n<strong>const<\/strong> handledArr = arr.map(<strong>function<\/strong>(elem, index, a) {\n  elem.age += 1;\n  console.log(elem, index, a);\n  <strong>return<\/strong> elem.name\n});\n\nconsole.log(arr);\nconsole.log(handledArr);<\/code><\/pre>\n\n\n\n<p class=\"has-medium-font-size\">\u65e0\u8fd4\u56de\u503c\u7684\u904d\u5386\uff1aforEach<\/p>\n\n\n\n<p>forEach \u7684\u7528\u6cd5\u548c map \u57fa\u672c\u4e00\u81f4\uff0c\u4e0d\u8fc7 forEach \u6ca1\u6709\u8fd4\u56de\u503c.<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code class=\"\"><strong>const<\/strong> handledArr = arr.forEach(<strong>function<\/strong>(elem, index, a) {\n  elem.age += 1;\n  console.log(elem, index, a);\n  <strong>return<\/strong> elem.name\n});\n\nconsole.log(handledArr);\n\/\/\u8f93\u51fa undefined<\/code><\/pre>\n\n\n\n<p style=\"font-size:25px\">Date\u5bf9\u8c61<\/p>\n\n\n\n<p>\u8fd9\u91cc\u5177\u4f53\u5217\u51fa get\u548cset\u65b9\u6cd5<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code lang=\"javascript\" class=\"language-javascript\"><strong>let<\/strong> dt = <strong>new<\/strong> Date();\ndt.getTime(); <em>\/\/ \u8fd4\u56de\u5b9e\u4f8b\u8ddd\u79bb1970\u5e741\u67081\u65e500:00:00\u7684\u6beb\u79d2\u6570\u3002<\/em>\ndt.getDate(); <em>\/\/ \u8fd4\u56de\u5b9e\u4f8b\u5bf9\u8c61\u5bf9\u5e94\u6bcf\u4e2a\u6708\u7684\u51e0\u53f7\uff08\u4ece1\u5f00\u59cb\uff09\u3002<\/em>\ndt.getDay(); <em>\/\/ \u8fd4\u56de\u661f\u671f\u51e0\uff0c\u661f\u671f\u65e5\u4e3a0\uff0c\u661f\u671f\u4e00\u4e3a1\uff0c\u4ee5\u6b64\u7c7b\u63a8\u3002<\/em>\ndt.getFullYear(); <em>\/\/ \u8fd4\u56de\u56db\u4f4d\u7684\u5e74\u4efd\u3002<\/em>\ndt.getMonth(); <em>\/\/ \u8fd4\u56de\u6708\u4efd\uff080\u8868\u793a1\u6708\uff0c11\u8868\u793a12\u6708\uff09\u3002<\/em>\ndt.getHours(); <em>\/\/ \u8fd4\u56de\u5c0f\u65f6\uff080-23\uff09\u3002<\/em>\ndt.getMilliseconds(); <em>\/\/ \u8fd4\u56de\u6beb\u79d2\uff080-999\uff09\u3002<\/em>\ndt.getMinutes(); <em>\/\/ \u8fd4\u56de\u5206\u949f\uff080-59\uff09\u3002<\/em>\ndt.getSeconds(); <em>\/\/ \u8fd4\u56de\u79d2\uff080-59\uff09\u3002<\/em>\n\u6ce8\u610f\uff0c\u6240\u6709\u8fd9\u4e9b get*\u65b9\u6cd5\u8fd4\u56de\u7684\u90fd\u662f\u6574\u6570\uff0c\u4e0d\u540c\u65b9\u6cd5\u8fd4\u56de\u503c\u7684\u8303\u56f4\u4e0d\u4e00\u6837\uff1a\n \u5206\u949f\u548c\u79d2\uff1a0 \u5230 59\n \u5c0f\u65f6\uff1a0 \u5230 23\n \u661f\u671f\uff1a0\uff08\u661f\u671f\u5929\uff09\u5230 6\uff08\u661f\u671f\u516d\uff09\n \u65e5\u671f\uff1a1 \u5230 31\n \u6708\u4efd\uff1a0\uff08\u4e00\u6708\uff09\u5230 11\uff08\u5341\u4e8c\u6708\uff09<\/code><\/pre>\n\n\n\n<pre class=\"wp-block-code\"><code class=\"\"><strong>let<\/strong> dt = <strong>new<\/strong> Date();\ndt.setTime(ms); <em>\/\/ \u8bbe\u7f6e\u5b9e\u4f8b\u8ddd\u79bb1970\u5e741\u67081\u65e500:00:00\u7684\u6beb\u79d2\u6570\u3002<\/em>\ndt.setDate(date); <em>\/\/ \u8bbe\u7f6e\u5b9e\u4f8b\u5bf9\u8c61\u5bf9\u5e94\u6bcf\u4e2a\u6708\u7684\u51e0\u53f7\uff08\u4ece1\u5f00\u59cb\uff09\u3002<\/em>\ndt.setFullYear(year); <em>\/\/ \u8bbe\u7f6e\u56db\u4f4d\u7684\u5e74\u4efd\u3002<\/em>\ndt.setMonth(month); <em>\/\/ \u8bbe\u7f6e\u6708\u4efd\uff080\u8868\u793a1\u6708\uff0c11\u8868\u793a12\u6708\uff09\u3002<\/em>\ndt.setHours(hour); <em>\/\/ \u8bbe\u7f6e\u5c0f\u65f6\uff080-23\uff09\u3002<\/em>\ndt.setMilliseconds(ms); <em>\/\/ \u8bbe\u7f6e\u6beb\u79d2\uff080-999\uff09\u3002<\/em>\ndt.setMinutes(min); <em>\/\/ \u8bbe\u7f6e\u5206\u949f\uff080-59\uff09\u3002<\/em>\ndt.setSeconds(sec); <em>\/\/ \u8bbe\u7f6e\u79d2\uff080-59\uff09\u3002<\/em><\/code><\/pre>\n\n\n\n<figure class=\"wp-block-image size-large\"><img decoding=\"async\" src=\"https:\/\/i2.wp.com\/qgt-document.oss-cn-beijing.aliyuncs.com\/P3-4-HTML-CSS\/7\/3.jpg?w=1170&#038;ssl=1\" alt=\"\" data-recalc-dims=\"1\"\/><\/figure>\n","protected":false},"excerpt":{"rendered":"<p>JavaScript\u662f\u4e00\u79cd\u4e13\u4e3a\u7f51\u9875\u4ea4\u4e92\u800c\u8bbe\u8ba1\u7684\u811a\u672c\u8bed\u8a00 \u5176\u4e3b\u8981\u5206\u4e3a\u4e09\u4e2a\u90e8\u5206 \u6838\u5fc3(ECMAScript) \u6587\u6863 [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"spay_email":"","footnotes":""},"categories":[5],"tags":[],"class_list":["post-523","post","type-post","status-publish","format-standard","hentry","category-5"],"jetpack_featured_media_url":"","_links":{"self":[{"href":"https:\/\/fireinsect.top\/index.php\/wp-json\/wp\/v2\/posts\/523"}],"collection":[{"href":"https:\/\/fireinsect.top\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/fireinsect.top\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/fireinsect.top\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/fireinsect.top\/index.php\/wp-json\/wp\/v2\/comments?post=523"}],"version-history":[{"count":20,"href":"https:\/\/fireinsect.top\/index.php\/wp-json\/wp\/v2\/posts\/523\/revisions"}],"predecessor-version":[{"id":562,"href":"https:\/\/fireinsect.top\/index.php\/wp-json\/wp\/v2\/posts\/523\/revisions\/562"}],"wp:attachment":[{"href":"https:\/\/fireinsect.top\/index.php\/wp-json\/wp\/v2\/media?parent=523"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/fireinsect.top\/index.php\/wp-json\/wp\/v2\/categories?post=523"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/fireinsect.top\/index.php\/wp-json\/wp\/v2\/tags?post=523"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}