{"id":119,"date":"2023-03-22T13:33:27","date_gmt":"2023-03-22T05:33:27","guid":{"rendered":"https:\/\/jianbo.site\/?p=119"},"modified":"2025-03-19T16:03:56","modified_gmt":"2025-03-19T08:03:56","slug":"js","status":"publish","type":"post","link":"https:\/\/jianbo.site\/index.php\/2023\/03\/22\/js\/","title":{"rendered":"js\u5b66\u4e60\u7b14\u8bb0"},"content":{"rendered":"\n<h1 class=\"wp-block-heading\">js\u57fa\u7840<\/h1>\n\n\n\n<h3 class=\"wp-block-heading\">1\u3001js\u6570\u636e\u7c7b\u578b<\/h3>\n\n\n\n<p>\u57fa\u672c\u6570\u636e\u7c7b\u578b<br>Number\u3001String\u3001Boolean\u3001Null\u3001Undefined\u3001Symbol\u3001bigInt<br>\u5f15\u7528\u6570\u636e\u7c7b\u578b<br>object\u3001Array\u3001Date\u3001Function\u3001RegExp<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">2\u3001js\u53d8\u91cf\u548c\u51fd\u6570\u58f0\u660e\u7684\u63d0\u5347<\/h3>\n\n\n\n<p>\u5728js\u4e2d\u53d8\u91cf\u548c\u51fd\u6570\u7684\u58f0\u660e\u4f1a\u63d0\u5347\u5230\u6700\u9876\u90e8\u6267\u884c<br>\u51fd\u6570\u7684\u63d0\u5347\u9ad8\u4e8e\u53d8\u91cf\u7684\u63d0\u5347<br>\u51fd\u6570\u5185\u90e8\u5982\u679c\u7528 var \u58f0\u660e\u4e86\u76f8\u540c\u540d\u79f0\u7684\u5916\u90e8\u53d8\u91cf\uff0c\u51fd\u6570\u5c06\u4e0d\u518d\u5411\u4e0a\u5bfb\u627e\u3002<br>\u533f\u540d\u51fd\u6570\u4e0d\u4f1a\u63d0\u5347\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">3\u3001\u95ed\u5305<\/h3>\n\n\n\n<p>\u95ed\u5305\u5c31\u662f\u80fd\u591f\u8bfb\u53d6\u5176\u4ed6\u51fd\u6570\u5185\u90e8\u53d8\u91cf\u7684\u51fd\u6570<br>\u95ed\u5305\u57fa\u672c\u4e0a\u5c31\u662f\u4e00\u4e2a\u51fd\u6570\u5185\u90e8\u8fd4\u56de\u4e00\u4e2a\u51fd\u6570<br>\u597d\u5904<br>\u53ef\u4ee5\u8bfb\u53d6\u51fd\u6570\u5185\u90e8\u7684\u53d8\u91cf<br>\u5c06\u53d8\u91cf\u59cb\u7ec8\u4fdd\u6301\u5728\u5185\u5b58\u4e2d<br>\u53ef\u4ee5\u5c01\u88c5\u5bf9\u8c61\u7684\u79c1\u6709\u5c5e\u6027\u548c\u79c1\u6709\u65b9\u6cd5<br>\u574f\u5904<br>\u6bd4\u8f83\u8017\u8d39\u5185\u5b58\u3001\u4f7f\u7528\u4e0d\u5f53\u4f1a\u9020\u6210\u5185\u5b58\u6ea2\u51fa\u7684\u95ee\u9898<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">4\u3001== \u548c ===\u7684\u533a\u522b<\/h3>\n\n\n\n<p>==\u662f\u975e\u4e25\u683c\u610f\u4e49\u4e0a\u7684\u76f8\u7b49<br>\u503c\u76f8\u7b49\u5c31\u76f8\u7b49<br>===\u662f\u4e25\u683c\u610f\u4e49\u4e0a\u7684\u76f8\u7b49\uff0c\u4f1a\u6bd4\u8f83\u4e24\u8fb9\u7684\u6570\u636e\u7c7b\u578b\u548c\u503c\u5927\u5c0f<br>\u503c\u548c\u5f15\u7528\u5730\u5740\u90fd\u76f8\u7b49\u624d\u76f8\u7b49<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">5\u3001this<\/h3>\n\n\n\n<p>this\u603b\u662f\u6307\u5411\u51fd\u6570\u7684\u76f4\u63a5\u8c03\u7528\u8005<br>\u5982\u679c\u6709new\u5173\u952e\u5b57\uff0cthis\u6307\u5411new\u51fa\u6765\u7684\u5bf9\u8c61<br>\u5728\u4e8b\u4ef6\u4e2d\uff0cthis\u6307\u5411\u89e6\u53d1\u8fd9\u4e2a\u4e8b\u4ef6\u7684\u5bf9\u8c61<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">6\u3001js\u6570\u7ec4\u548c\u5bf9\u8c61\u7684\u904d\u5386\u65b9\u5f0f<\/h3>\n\n\n\n<p>for in<br>for<br>forEach<br>for-of<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">7\u3001map\u4e0eforEach\u7684\u533a\u522b<\/h3>\n\n\n\n<p>forEach \u65b9\u6cd5\uff0c\u662f\u6700\u57fa\u672c\u7684\u65b9\u6cd5\uff0c\u5c31\u662f\u904d\u5386\u4e0e\u5faa\u73af\uff0c\u9ed8\u8ba4\u6709 3 \u4e2a\u4f20\u53c2\uff1a\u5206\u522b\u662f\u904d\u5386\u7684\u6570\u7ec4\u5185<br>\u5bb9 item\u3001\u6570\u7ec4\u7d22\u5f15 index\u3001\u548c\u5f53\u524d\u904d\u5386\u6570\u7ec4 Array<br>map \u65b9\u6cd5\uff0c\u57fa\u672c\u7528\u6cd5\u4e0e forEach \u4e00\u81f4\uff0c\u4f46\u662f\u4e0d\u540c\u7684\uff0c\u5b83\u4f1a\u8fd4\u56de\u4e00\u4e2a\u65b0\u7684\u6570\u7ec4\uff0c\u6240\u4ee5 callback<br>\u9700\u8981\u6709 return \u503c\uff0c\u5982\u679c\u6ca1\u6709\uff0c\u4f1a\u8fd4\u56de undefined<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">8\u3001\u7bad\u5934\u51fd\u6570\u4e0e\u666e\u901a\u51fd\u6570\u7684\u533a\u522b?<\/h3>\n\n\n\n<p>\u51fd\u6570\u4f53\u5185\u7684 this \u5bf9\u8c61\uff0c\u5c31\u662f\u5b9a\u4e49\u65f6\u6240\u5728\u7684\u5bf9\u8c61\uff0c\u800c\u4e0d\u662f\u4f7f\u7528\u65f6\u6240\u5728\u7684\u5bf9\u8c61<br>\u4e0d\u53ef\u4ee5\u5f53\u4f5c\u6784\u9020\u51fd\u6570\uff0c\u4e5f\u5c31\u662f\u8bf4\uff0c\u4e0d\u53ef\u4ee5\u4f7f\u7528 new \u547d\u4ee4\uff0c\u5426\u5219\u4f1a\u629b\u51fa\u4e00\u4e2a\u9519\u8bef<br>\u4e0d\u53ef\u4ee5\u4f7f\u7528 arguments \u5bf9\u8c61\uff0c\u8be5\u5bf9\u8c61\u5728\u51fd\u6570\u4f53\u5185\u4e0d\u5b58\u5728\u3002\u5982\u679c\u8981\u7528\uff0c\u53ef\u4ee5\u7528 Rest \u53c2\u6570\u4ee3\u66ff<br>\u4e0d\u53ef\u4ee5\u4f7f\u7528 yield \u547d\u4ee4\uff0c\u56e0\u6b64\u7bad\u5934\u51fd\u6570\u4e0d\u80fd\u7528\u4f5c Generator \u51fd\u6570<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">9\u3001\u540c\u6e90\u7b56\u7565<\/h3>\n\n\n\n<p>\u540c\u6e90\u6307\u7684\u662f\u57df\u540d\u3001\u534f\u8bae\u3001\u7aef\u53e3\u53f7\u76f8\u540c<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">10\u3001\u5982\u4f55\u89e3\u51b3\u8de8\u57df<\/h3>\n\n\n\n<p>jsonp\u8de8\u57df<br>document.domain + iframe \u8de8\u57df<br>nodejs\u4e2d\u95f4\u4ef6\u4ee3\u7406\u8de8\u57df<br>\u540e\u7aef\u5728\u5934\u90e8\u4fe1\u606f\u91cc\u9762\u8bbe\u7f6e\u5b89\u5168\u57df\u540d<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">11\u3001\u4e25\u683c\u6a21\u5f0f\u7684\u9650\u5236<\/h3>\n\n\n\n<p>\u53d8\u91cf\u5fc5\u987b\u58f0\u660e\u540e\u518d\u4f7f\u7528<br>\u51fd\u6570\u7684\u53c2\u6570\u4e0d\u80fd\u6709\u540c\u540d\u5c5e\u6027\uff0c\u5426\u5219\u62a5\u9519<br>\u4e0d\u80fd\u4f7f\u7528 with \u8bed\u53e5<br>\u7981\u6b62 this \u6307\u5411\u5168\u5c40\u5bf9\u8c61<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">12\u3001es6\u65b0\u589e<\/h3>\n\n\n\n<p>\u65b0\u589e\u6a21\u677f\u5b57\u7b26\u4e32<br>\u7bad\u5934\u51fd\u6570<br>for-of\uff08\u7528\u6765\u904d\u5386\u6570\u636e\u2014\u4f8b\u5982\u6570\u7ec4\u4e2d\u7684\u503c\u3002\uff09<br>ES6 \u5c06 Promise \u5bf9\u8c61\u7eb3\u5165\u89c4\u8303\uff0c\u63d0\u4f9b\u4e86\u539f\u751f\u7684 Promise \u5bf9\u8c61\u3002<br>\u589e\u52a0\u4e86 let \u548c const \u547d\u4ee4\uff0c\u7528\u6765\u58f0\u660e\u53d8\u91cf\u3002<br>\u8fd8\u6709\u5c31\u662f\u5f15\u5165 module \u6a21\u5757\u7684\u6982\u5ff5<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">13\u3001attribute \u548c property \u7684\u533a\u522b\u662f\u4ec0\u4e48?<\/h3>\n\n\n\n<p>attribute \u662f dom \u5143\u7d20\u5728\u6587\u6863\u4e2d\u4f5c\u4e3a html \u6807\u7b7e\u62e5\u6709\u7684\u5c5e\u6027<br>property \u5c31\u662f dom \u5143\u7d20\u5728 js \u4e2d\u4f5c\u4e3a\u5bf9\u8c61\u62e5\u6709\u7684\u5c5e\u6027\u3002<br>\u5bf9\u4e8e html \u7684\u6807\u51c6\u5c5e\u6027\u6765\u8bf4\uff0cattribute \u548c property \u662f\u540c\u6b65\u7684\uff0c\u662f\u4f1a\u81ea\u52a8\u66f4\u65b0\u7684<br>\u4f46\u662f\u5bf9\u4e8e\u81ea\u5b9a\u4e49\u7684\u5c5e\u6027\u6765\u8bf4\uff0c\u4ed6\u4eec\u662f\u4e0d\u540c\u6b65\u7684<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">14\u3001let\u548cconst \u7684\u533a\u522b\u662f\u4ec0\u4e48?<\/h3>\n\n\n\n<p>let \u547d\u4ee4\u4e0d\u5b58\u5728\u53d8\u91cf\u63d0\u5347\uff0c\u5982\u679c\u5728 let \u524d\u4f7f\u7528\uff0c\u4f1a\u5bfc\u81f4\u62a5\u9519<br>\u5982\u679c\u5757\u533a\u4e2d\u5b58\u5728 let \u548c const \u547d\u4ee4\uff0c\u5c31\u4f1a\u5f62\u6210\u5c01\u95ed\u4f5c\u7528\u57df<br>\u4e0d\u5141\u8bb8\u91cd\u590d\u58f0\u660e<br>const\u5b9a\u4e49\u7684\u662f\u5e38\u91cf\uff0c\u4e0d\u80fd\u4fee\u6539\uff0c\u4f46\u662f\u5982\u679c\u5b9a\u4e49\u7684\u662f\u5bf9\u8c61\uff0c\u53ef\u4ee5\u4fee\u6539\u5bf9\u8c61\u5185\u90e8\u7684\u6570\u636e<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">15\u3001\u5185\u5b58\u6cc4\u6f0f<\/h3>\n\n\n\n<p>\u5b9a\u4e49\uff1a\u7a0b\u5e8f\u4e2d\u5df1\u52a8\u6001\u5206\u914d\u7684\u5806\u5185\u5b58\u7531\u4e8e\u67d0\u79cd\u539f\u56e0\u7a0b\u5e8f\u672a\u91ca\u653e\u6216\u65e0\u6cd5\u91ca\u653e\u5f15\u53d1\u7684\u5404\u79cd\u95ee\u9898\u3002<br>js\u4e2d\u53ef\u80fd\u51fa\u73b0\u7684\u5185\u5b58\u6cc4\u6f0f\u60c5\u51b5\uff1a\u7ed3\u679c\uff1a\u53d8\u6162\uff0c\u5d29\u6e83\uff0c\u5ef6\u8fdf\u5927\u7b49<br>js\u4e2d\u53ef\u80fd\u51fa\u73b0\u7684\u5185\u5b58\u6cc4\u6f0f\u539f\u56e0<br>\u5168\u5c40\u53d8\u91cf<br>dom \u6e05\u7a7a\u65f6\uff0c\u8fd8\u5b58\u5728\u5f15\u7528<br>\u5b9a\u65f6\u5668\u672a\u6e05\u9664<br>\u5b50\u5143\u7d20\u5b58\u5728\u5f15\u8d77\u7684\u5185\u5b58\u6cc4\u9732<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">16\u3001script \u5f15\u5165\u65b9\u5f0f?<\/h3>\n\n\n\n<p>html \u9759\u6001 &lt;script&gt; \u5f15\u5165<\/p>\n\n\n\n<p>js \u52a8\u6001\u63d2\u5165 &lt;script&gt;<\/p>\n\n\n\n<p>&lt;script defer&gt; : \u5f02\u6b65\u52a0\u8f7d\uff0c\u5143\u7d20\u89e3\u6790\u5b8c\u6210\u540e\u6267\u884c<\/p>\n\n\n\n<p>&lt;script async&gt; : \u5f02\u6b65\u52a0\u8f7d\uff0c\u4f46\u6267\u884c\u65f6\u4f1a\u963b\u585e\u5143\u7d20\u6e32\u67d3<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">17\u3001\u6570\u7ec4(array)\u65b9\u6cd5<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>map : \u904d\u5386\u6570\u7ec4\uff0c\u8fd4\u56de\u56de\u8c03\u8fd4\u56de\u503c\u7ec4\u6210\u7684\u65b0\u6570\u7ec4<\/li>\n\n\n\n<li>forEach : \u65e0\u6cd5 break \uff0c\u53ef\u4ee5\u7528 try\/catch \u4e2d throw new Error \u6765\u505c\u6b62<\/li>\n\n\n\n<li>filter : \u8fc7\u6ee4<\/li>\n\n\n\n<li>some : \u6709\u4e00\u9879\u8fd4\u56de true \uff0c\u5219\u6574\u4f53\u4e3a true<\/li>\n\n\n\n<li>every : \u6709\u4e00\u9879\u8fd4\u56de false \uff0c\u5219\u6574\u4f53\u4e3a false<\/li>\n\n\n\n<li>join : \u901a\u8fc7\u6307\u5b9a\u8fde\u63a5\u7b26\u751f\u6210\u5b57\u7b26\u4e32<\/li>\n\n\n\n<li>push \/ pop : \u672b\u5c3e\u63a8\u5165\u548c\u5f39\u51fa\uff0c\u6539\u53d8\u539f\u6570\u7ec4\uff0c \u8fd4\u56de\u63a8\u5165\/\u5f39\u51fa\u9879<\/li>\n\n\n\n<li>unshift \/ shift : \u5934\u90e8\u63a8\u5165\u548c\u5f39\u51fa\uff0c\u6539\u53d8\u539f\u6570\u7ec4\uff0c\u8fd4\u56de\u64cd\u4f5c\u9879<\/li>\n\n\n\n<li>sort(fn) \/ reverse : \u6392\u5e8f\u4e0e\u53cd\u8f6c\uff0c\u6539\u53d8\u539f\u6570\u7ec4<\/li>\n\n\n\n<li>concat : \u8fde\u63a5\u6570\u7ec4\uff0c\u4e0d\u5f71\u54cd\u539f\u6570\u7ec4\uff0c \u6d45\u62f7\u8d1d<\/li>\n\n\n\n<li>slice(start, end) : \u8fd4\u56de\u622a\u65ad\u540e\u7684\u65b0\u6570\u7ec4\uff0c\u4e0d\u6539\u53d8\u539f\u6570\u7ec4<\/li>\n\n\n\n<li>splice(start,number,value\u2026): \u8fd4\u56de\u5220\u9664\u5143\u7d20\u7ec4\u6210\u7684\u6570\u7ec4\uff0cvalue \u4e3a\u63d2\u5165\u9879\uff0c\u6539\u53d8\u539f\u6570\u7ec4<\/li>\n\n\n\n<li>indexOf \/ lastIndexOf(value, fromIndex) : \u67e5\u627e\u6570\u7ec4\u9879\uff0c\u8fd4\u56de\u5bf9\u5e94\u7684\u4e0b\u6807<\/li>\n\n\n\n<li>reduce \/ reduceRight(fn(prev, cur) \uff0cdefaultPrev) : \u4e24\u4e24\u6267\u884c\uff0cprev \u4e3a\u4e0a\u6b21\u5316\u7b80\u51fd\u6570\u7684return \u503c\uff0ccur \u4e3a\u5f53\u524d\u503c(\u4ece\u7b2c\u4e8c\u9879\u5f00\u59cb)<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">18\u3001JavaScript \u6df1\u6d45\u62f7\u8d1d?<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u6d45\u62f7\u8d1d<\/li>\n\n\n\n<li>Object.assign<\/li>\n\n\n\n<li>\u6df1\u62f7\u8d1d<\/li>\n\n\n\n<li>\u53ef\u4ee5\u901a\u8fc7 JSON.parse(JSON.stringify(object)) \u6765\u89e3\u51b3<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">19\u3001\u8bf4\u8bf4\u5f02\u6b65\u7f16\u7a0b\u7684\u5b9e\u73b0\u65b9\u5f0f?<\/h3>\n\n\n\n<h4 class=\"wp-block-heading\">\u56de\u8c03\u51fd\u6570<\/h4>\n\n\n\n<p>\u4f18\u70b9\uff1a\u7b80\u5355\u3001\u5bb9\u6613\u7406\u89e3<\/p>\n\n\n\n<p>\u7f3a\u70b9\uff1a\u4e0d\u5229\u4e8e\u7ef4\u62a4\u3001\u4ee3\u7801\u8026\u5408\u9ad8<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">\u4e8b\u4ef6\u76d1\u542c<\/h4>\n\n\n\n<p>\u4f18\u70b9\uff1a\u5bb9\u6613\u7406\u89e3\uff0c\u53ef\u4ee5\u7ed1\u5b9a\u591a\u4e2a\u4e8b\u4ef6\uff0c\u6bcf\u4e2a\u4e8b\u4ef6\u53ef\u4ee5\u6307\u5b9a\u591a\u4e2a\u56de\u8c03\u51fd\u6570<\/p>\n\n\n\n<p>\u7f3a\u70b9\uff1a\u4e8b\u4ef6\u9a71\u52a8\u578b\uff0c\u6d41\u7a0b\u4e0d\u591f\u6e05\u6670<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">\u53d1\u5e03\/\u8ba2\u9605(\u89c2\u5bdf\u8005\u6a21\u5f0f)<\/h4>\n\n\n\n<p>\u7c7b\u4f3c\u4e8e\u4e8b\u4ef6\u76d1\u542c\uff0c\u4f46\u662f\u53ef\u4ee5\u901a\u8fc7\u2018\u6d88\u606f\u4e2d\u5fc3\u2019\uff0c\u4e86\u89e3\u73b0\u5728\u6709\u591a\u5c11\u53d1\u5e03\u8005\uff0c\u591a\u5c11\u8ba2\u9605\u8005<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">Promise \u5bf9\u8c61<\/h4>\n\n\n\n<p>\u4f18\u70b9\uff1a\u53ef\u4ee5\u5229\u7528 then \u65b9\u6cd5\uff0c\u8fdb\u884c\u94fe\u5f0f\u5199\u6cd5\uff1b\u53ef\u4ee5\u4e66\u5199\u9519\u8bef\u65f6\u7684\u56de\u8c03\u51fd\u6570<\/p>\n\n\n\n<p>\u7f3a\u70b9\uff1a\u7f16\u5199\u548c\u7406\u89e3\uff0c\u76f8\u5bf9\u6bd4\u8f83\u96be<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">Generator \u51fd\u6570<\/h4>\n\n\n\n<p>\u4f18\u70b9\uff1a\u51fd\u6570\u4f53\u5185\u5916\u7684\u6570\u636e\u4ea4\u6362\u3001\u9519\u8bef\u5904\u7406\u673a\u5236<\/p>\n\n\n\n<p>\u7f3a\u70b9\uff1a\u6d41\u7a0b\u7ba1\u7406\u4e0d\u65b9\u4fbf<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">async \u51fd\u6570<\/h4>\n\n\n\n<p>\u4f18\u70b9\uff1a\u5185\u7f6e\u6267\u884c\u5668\u3001\u66f4\u597d\u7684\u8bed\u4e49\u3001\u66f4\u5e7f\u7684\u9002\u7528\u6027\u3001\u8fd4\u56de\u7684\u662f Promise\u3001\u7ed3\u6784\u6e05\u6670<\/p>\n\n\n\n<p>\u7f3a\u70b9\uff1a\u9519\u8bef\u5904\u7406\u673a\u5236<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">20\u3001\u8bf4\u8bf4\u9762\u5411\u5bf9\u8c61\u7f16\u7a0b\u601d\u60f3?<\/h3>\n\n\n\n<p>\u57fa\u672c\u601d\u60f3\u662f\u4f7f\u7528\u5bf9\u8c61\uff0c\u7c7b\uff0c\u7ee7\u627f\uff0c\u5c01\u88c5\u7b49\u57fa\u672c\u6982\u5ff5\u6765\u8fdb\u884c\u7a0b\u5e8f\u8bbe\u8ba1<\/p>\n\n\n\n<p>\u4f18\u70b9<\/p>\n\n\n\n<p>\u6613\u7ef4\u62a4<\/p>\n\n\n\n<p>\u6613\u6269\u5c55<\/p>\n\n\n\n<p>\u5f00\u53d1\u5de5\u4f5c\u7684\u91cd\u7528\u6027\u3001\u7ee7\u627f\u6027\u9ad8\uff0c\u964d\u4f4e\u91cd\u590d\u5de5\u4f5c\u91cf\u3002<\/p>\n\n\n\n<p>\u7f29\u77ed\u4e86\u5f00\u53d1\u5468\u671f<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">21\u3001\u9879\u76ee\u6027\u80fd\u4f18\u5316<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u51cf\u5c11 HTTP \u8bf7\u6c42\u6570<\/li>\n\n\n\n<li>\u51cf\u5c11 DNS \u67e5\u8be2<\/li>\n\n\n\n<li>\u4f7f\u7528 CDN<\/li>\n\n\n\n<li>\u907f\u514d\u91cd\u5b9a\u5411<\/li>\n\n\n\n<li>\u56fe\u7247\u61d2\u52a0\u8f7d<\/li>\n\n\n\n<li>\u51cf\u5c11 DOM \u5143\u7d20\u6570\u91cf<\/li>\n\n\n\n<li>\u51cf\u5c11 DOM \u64cd\u4f5c<\/li>\n\n\n\n<li>\u4f7f\u7528\u5916\u90e8 JavaScript \u548c CSS<\/li>\n\n\n\n<li>\u538b\u7f29 JavaScript\u3001CSS\u3001\u5b57\u4f53\u3001\u56fe\u7247\u7b49<\/li>\n\n\n\n<li>\u4f18\u5316 CSS Sprite<\/li>\n\n\n\n<li>\u4f7f\u7528 iconfont<\/li>\n\n\n\n<li>\u591a\u57df\u540d\u5206\u53d1\u5212\u5206\u5185\u5bb9\u5230\u4e0d\u540c\u57df\u540d<\/li>\n\n\n\n<li>\u5c3d\u91cf\u51cf\u5c11 iframe \u4f7f\u7528<\/li>\n\n\n\n<li>\u907f\u514d\u56fe\u7247 src \u4e3a\u7a7a<\/li>\n\n\n\n<li>\u628a\u6837\u5f0f\u8868\u653e\u5728 link \u4e2d<\/li>\n\n\n\n<li>\u628a JavaScript \u653e\u5728\u9875\u9762\u5e95\u90e8<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">22\u3001\u4ec0\u4e48\u662f\u5355\u7ebf\u7a0b\uff0c\u548c\u5f02\u6b65\u7684\u5173\u7cfb\uff1f<\/h3>\n\n\n\n<p>\u5355\u7ebf\u7a0b \uff1a\u53ea\u6709\u4e00\u4e2a\u7ebf\u7a0b\uff0c\u53ea\u80fd\u505a\u4e00\u4ef6\u4e8b<\/p>\n\n\n\n<p>\u539f\u56e0 \uff1a \u907f\u514d DOM \u6e32\u67d3\u7684\u51b2\u7a81<\/p>\n\n\n\n<p>\u6d4f\u89c8\u5668\u9700\u8981\u6e32\u67d3 DOM<\/p>\n\n\n\n<p>JS \u53ef\u4ee5\u4fee\u6539 DOM \u7ed3\u6784<\/p>\n\n\n\n<p>JS \u6267\u884c\u7684\u65f6\u5019\uff0c\u6d4f\u89c8\u5668 DOM \u6e32\u67d3\u4f1a\u6682\u505c<\/p>\n\n\n\n<p>\u4e24\u6bb5 JS \u4e5f\u4e0d\u80fd\u540c\u65f6\u6267\u884c\uff08\u90fd\u4fee\u6539 DOM \u5c31\u51b2\u7a81\u4e86\uff09<\/p>\n\n\n\n<p>webworker \u652f\u6301\u591a\u7ebf\u7a0b\uff0c\u4f46\u662f\u4e0d\u80fd\u8bbf\u95ee DOM<\/p>\n\n\n\n<p>\u89e3\u51b3\u65b9\u6848 \uff1a\u5f02\u6b65<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">23\u3001\u8bf4\u8bf4\u8d1f\u8f7d\u5747\u8861\uff1f<\/h3>\n\n\n\n<p>\u5355\u53f0\u670d\u52a1\u5668\u5171\u540c\u534f\u4f5c\uff0c\u4e0d\u8ba9\u5176\u4e2d\u67d0\u4e00\u53f0\u6216\u51e0\u53f0\u8d85\u989d\u5de5\u4f5c\uff0c\u53d1\u6325\u670d\u52a1\u5668\u7684\u6700\u5927\u4f5c\u7528<\/p>\n\n\n\n<p>http \u91cd\u5b9a\u5411\u8d1f\u8f7d\u5747\u8861\uff1a\u8c03\u5ea6\u8005\u6839\u636e\u7b56\u7565\u9009\u62e9\u670d\u52a1\u5668\u4ee5 302 \u54cd\u5e94\u8bf7\u6c42\uff0c\u7f3a\u70b9\u53ea\u6709\u7b2c\u4e00\u6b21\u6709\u6548\u679c\uff0c\u540e\u7eed\u64cd\u4f5c\u7ef4\u6301\u5728\u8be5\u670d\u52a1\u5668 dns \u8d1f\u8f7d\u5747\u8861\uff1a\u89e3\u6790\u57df\u540d\u65f6\uff0c\u8bbf\u95ee\u591a\u4e2a ip \u670d\u52a1\u5668\u4e2d\u7684\u4e00\u4e2a\uff08\u53ef\u76d1\u63a7\u6027\u8f83\u5f31\uff09\u539f\u56e0 &#8211; \u907f\u514d DOM \u6e32\u67d3\u7684\u51b2\u7a81<\/p>\n\n\n\n<p>\u53cd\u5411\u4ee3\u7406\u8d1f\u8f7d\u5747\u8861\uff1a\u8bbf\u95ee\u7edf\u4e00\u7684\u670d\u52a1\u5668\uff0c\u7531\u670d\u52a1\u5668\u8fdb\u884c\u8c03\u5ea6\u8bbf\u95ee\u5b9e\u9645\u7684\u67d0\u4e2a\u670d\u52a1\u5668\uff0c\u5bf9\u7edf\u4e00\u7684\u670d\u52a1\u5668\u8981\u6c42\u5927\uff0c\u6027\u80fd\u53d7\u5230 \u670d\u52a1\u5668\u7fa4\u7684\u6570\u91cf<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">24\u3001\u4f5c\u7528\u57df\u94fe\uff1f<\/h3>\n\n\n\n<p>\u4f5c\u7528\u57df\u94fe\u53ef\u4ee5\u7406\u89e3\u4e3a\u4e00\u7ec4\u5bf9\u8c61\u5217\u8868\uff0c\u5305\u542b \u7236\u7ea7\u548c\u81ea\u8eab\u7684\u53d8\u91cf\u5bf9\u8c61\uff0c\u56e0\u6b64\u6211\u4eec\u4fbf\u80fd\u901a\u8fc7\u4f5c\u7528\u57df\u94fe\u8bbf\u95ee\u5230\u7236\u7ea7\u91cc\u58f0\u660e\u7684\u53d8\u91cf\u6216\u8005\u51fd\u6570<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">25\u3001\u4ec0\u4e48\u662f\u539f\u578b\u3001\u539f\u578b\u94fe\u3001\u7ee7\u627f\uff1f<\/h3>\n\n\n\n<p>\u6240\u6709\u7684\u51fd\u6570\u90fd\u6709prototype\u5c5e\u6027\uff08\u539f\u578b\uff09<\/p>\n\n\n\n<p>\u6240\u6709\u7684\u5bf9\u8c61\u90fd\u6709__proto__\u5c5e\u6027<\/p>\n\n\n\n<p>\u5728Javascript\u4e2d\uff0c\u6bcf\u4e2a\u51fd\u6570\u90fd\u6709\u4e00\u4e2a\u539f\u578b\u5c5e\u6027prototype\u6307\u5411\u81ea\u8eab\u7684\u539f\u578b\uff0c\u800c\u7531\u8fd9\u4e2a\u51fd\u6570\u521b\u5efa\u7684\u5bf9\u8c61\u4e5f\u6709\u4e00\u4e2aproto\u5c5e\u6027\u6307\u5411\u8fd9\u4e2a\u539f\u578b\uff0c\u800c\u51fd\u6570\u7684\u539f\u578b\u662f\u4e00\u4e2a\u5bf9\u8c61\uff0c\u6240\u4ee5\u8fd9\u4e2a\u5bf9\u8c61\u4e5f\u4f1a\u6709\u4e00\u4e2aproto\u6307\u5411\u81ea\u5df1\u7684\u539f\u578b\uff0c\u8fd9\u6837\u9010\u5c42\u6df1\u5165\u76f4\u5230Object\u5bf9\u8c61\u7684\u539f\u578b\uff0c\u8fd9\u6837\u5c31\u5f62\u6210\u4e86\u539f\u578b\u94fe\u3002<\/p>\n\n\n\n<h3 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