{"id":6086,"date":"2022-04-03T19:28:11","date_gmt":"2022-04-03T11:28:11","guid":{"rendered":"https:\/\/egonlin.com\/?p=6086"},"modified":"2022-04-16T19:29:22","modified_gmt":"2022-04-16T11:29:22","slug":"%e7%ac%ac%e5%9b%9b%e8%8a%82%ef%bc%9ajavascrpt","status":"publish","type":"post","link":"https:\/\/egonlin.com\/?p=6086","title":{"rendered":"\u7b2c\u56db\u8282\uff1aJavaScrpt"},"content":{"rendered":"<h1>JavaScript<\/h1>\n<p><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='https:\/\/egonlin.com\/wp-content\/uploads\/2022\/04\/JavaScrpt1.jpg'><img class=\"lazyload lazyload-style-2\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  data-original=\"https:\/\/egonlin.com\/wp-content\/uploads\/2022\/04\/JavaScrpt1.jpg\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"\" \/><\/div><\/p>\n<h2>\u4e00\u3001JavaScript\u7b80\u4ecb<\/h2>\n<p>JavaScript\uff0c\u901a\u5e38\u4f1a\u7b80\u79f0\u4e3a&#8217;JS&#8217;, \u662f\u4e00\u79cd\u6d4f\u89c8\u5668\u811a\u672c\u8bed\u8a00\u3002<\/p>\n<h3>1\u3001JavaScript\u8bed\u8a00\u7684\u7279\u70b9<\/h3>\n<p>l JavaScript\u662f\u4e00\u79cd\u811a\u672c\u7f16\u7a0b\u8bed\u8a00\uff0c\u662f\u4e00\u79cd\u89e3\u91ca\u6027\u8bed\u8a00\uff0c<\/p>\n<p>l JavaScript\u7684\u8bed\u6cd5\u7ed3\u6784\u4e0eC++\u3001java\u5341\u5206\u7c7b\u4f3c<\/p>\n<p>l JavaScript\u662f\u5f31\u7c7b\u578b\u8bed\u8a00<\/p>\n<p>l JavaScript\u662f\u4e8b\u4ef6\u9a71\u52a8\u7684\u8bed\u8a00<\/p>\n<p>l JavaScript\u662f\u4e00\u79cd\u57fa\u4e8e\u5bf9\u8c61\u7684\u8bed\u8a00<\/p>\n<p>l JavaScript\u5177\u6709\u8de8\u5e73\u53f0\u6027\u3002<\/p>\n<p>l JavaScript\u5177\u6709\u5b89\u5168\u6027\u4e0e\u7b80\u5355\u6027<\/p>\n<h3>2\u3001JavaScript\u7ec4\u6210\u90e8\u5206<\/h3>\n<p>JavaScript\u7531\u4e09\u5927\u90e8\u5206\u7ec4\u6210\uff0c\u5206\u522b\u4e3a\uff1a<\/p>\n<p>l *\u6d4f\u89c8\u5668\u6807\u51c6\u8bed\u8a00\u6838\u5fc3\u8bed\u6cd5<\/p>\n<p>l BOM \u6d4f\u89c8\u5668\u5bf9\u8c61\u6a21\u578b<\/p>\n<p>l DOM \u6587\u6863\u5bf9\u8c61\u6a21\u578b<\/p>\n<h2>\u4e8c\u3001JavaScript\u57fa\u672c\u8bed\u6cd5<\/h2>\n<h3>1\u3001\u5728HTML\u4e2d\u4f7f\u7528<\/h3>\n<p>\u5728`<script>\u6807\u7b7e\u5185 \u5199\u4ee3\u7801<\/p>\n<pre><code class=\"language-css\">  &lt;script&gt;\n      alert(&#039;hello world&#039;)\n  &lt;\/script&gt;<\/code><\/pre>\n<p>\u5f15\u5165\u5916\u90e8 \u811a\u672c\u6587\u4ef6<\/p>\n<pre><code class=\"language-css\">  &lt;script src=&quot;.\/script.js&quot;&gt;&lt;\/script&gt;<\/code><\/pre>\n<p>\u901a\u8fc7\u4e8b\u4ef6\u5c5e\u6027\u5b9a\u4e49\u5728\u5143\u7d20\u5185\u90e8<\/p>\n<pre><code class=\"language-css\">  &lt;button onclick=&quot;alert(&#039;\u554a\uff0c\u597d\u75bc\u554a&#039;)&quot;&gt;\u70b9\u6211\u554a&lt;\/button&gt;<\/code><\/pre>\n<h3>2\u3001JavaScript \u6ce8\u91ca<\/h3>\n<p>* \u5355\u884c\u6ce8\u91ca<\/p>\n<pre><code class=\"language-css\">  \/\/ \u6211\u662f\u6ce8\u91ca<\/code><\/pre>\n<p>* \u591a\u884c\u6ce8\u91ca<\/p>\n<pre><code class=\"language-css\">  \/*\n  *\/<\/code><\/pre>\n<h3>3\u3001\u8f93\u51fa\u5185\u5bb9<\/h3>\n<pre><code class=\"language-css\">document.write(&#039;\u4f60\u662f\u4e0d\u662f\u559c\u6b22\u6211?&#039;);  \/\/\u76f4\u63a5\u8f93\u51fa\u5230\u9875\u9762\nconsole.log(&#039;hello world&#039;);  \/\/\u63a7\u5236\u53f0\u8f93\u51fa<\/code><\/pre>\n<h3>4\u3001\u53d8\u91cf<\/h3>\n<pre><code class=\"language-css\">\/\/javascript \u4f7f\u7528var \u5173\u952e\u5b57\u5b9a\u4e49\u53d8\u91cf\nvar username = &#039;xiaolili&#039;\n\/\/ES6 \u4e2d\u65b0\u589e let\u5173\u952e\u5b57\nlet userage = 100<\/code><\/pre>\n<p><strong><em>*\u53d8\u91cf\u540d\u547d\u540d\u89c4\u8303*<\/em><\/strong><\/p>\n<pre><code class=\"language-css\">\u6807\u8bc6\u7b26\u5fc5\u987b \u7531 &quot;\u6570\u5b57&quot;,&quot;\u5b57\u6bcd&quot;, &quot;_&quot;  \u6216\u8005 &quot;$&quot; \u7ec4\u6210,\u5e76\u4e14\u4e0d\u80fd\u4ee5\u6570\u5b57 \u5f00\u5934\n\u6807\u8bc6\u7b26\u4e0d\u80fd\u4e0e\u4fdd\u7559\u5b57\u51b2\u7a81\n\u533a\u5206\u5927\u5c0f\u5199<\/code><\/pre>\n<p><strong><em>\\<\/em>\u4fdd\u7559\u5b57\u8be6\u7ec6\u5217\u8868(\u6309\u5b57\u6bcd\u6392\u5e8f*****<\/strong>*)****<\/p>\n<pre><code class=\"language-css\">abstract boolean break byte case catch char class const continue\ndebugger default delete do double else enum export extends\nfalse final finally float for function\ngoto if implements import in instanceof int interface\nlong native new null package private protected public\nreturn short static super switch synchronized\nthis throw throws transient true try typeof\nvar void volatile while with<\/code><\/pre>\n<h2>\u4e09\u3001JavaScript\u6570\u636e\u7c7b\u578b<\/h2>\n<p>JavaScript\u7684\u6570\u636e\u7c7b\u578b\u5206\u4e3a\u539f\u59cb\u7c7b\u578b\u548c\u5bf9\u8c61\u7c7b\u578b\uff0c\u8fd9\u91cc\u6211\u4eec\u5148\u6765\u4e86\u89e3\u539f\u59cb\u7c7b\u578b.<\/p>\n<table>\n<thead>\n<tr>\n<th>\u539f\u59cb\u7c7b\u578b<\/th>\n<th>\u6570\u5b57,\u5b57\u7b26\u4e32,\u5e03\u5c14\u503c,\u7a7a,\u672a\u5b9a\u4e49<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>\u5bf9\u8c61\u7c7b\u578b<\/td>\n<td>\u6570\u7ec4,\u51fd\u6570,\u65e5\u671f,\u6b63\u5219,\u9519\u8bef,\u5bf9\u8c61\u7b49<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h3>1\u3001\u6570\u5b57\u7c7b\u578b<\/h3>\n<p>\u6d6e\u70b9\u7cbe\u5ea6\u95ee\u9898<\/p>\n<pre><code class=\"language-css\">console.log(.1 + .2)<\/code><\/pre>\n<p>\u6570\u503c\u8303\u56f4<\/p>\n<pre><code class=\"language-css\">\u53ef\u8868\u793a\u7684\u6570\u5b57\u8303\u56f4\uff1a `-5e324 ~ 1.7976931348623157e+308`\n\u8d85\u8fc7\u8303\u56f4\uff0c\u4f1a\u663e\u793a\u4e3a Infinity\\(\u6b63\u65e0\u7a77\\) \u6216 -Infinity\\(\u8d1f\u65e0\u7a77\\)\nisFinite()    \/\/\u51fd\u6570\u5224\u65ad\u662f\u5426\u5728\u8303\u56f4\u5185<\/code><\/pre>\n<p>\u7279\u6b8a\u7684Number\u503c NaN<\/p>\n<pre><code class=\"language-css\">\u8868\u793aNot A Number\uff0c\u7c7b\u578b\u662fNumber \u4f46\u53c8\u4e0d\u662f\u5e38\u89c4\u7684\u6570\u5b57\n\u548c\u4efb\u4f55\u503c\u90fd\u4e0d\u76f8\u7b49\n\u4e0e\u4efb\u4f55\u503c\u8fd0\u7b97,\u7ed3\u679c\u8fd8\u662fNaN\nisNaN()    \/\/\u51fd\u6570 \u5224\u8bfb\u662f\u5426\u662f NaN<\/code><\/pre>\n<h3>2\u3001\u5b57\u7b26\u4e32<\/h3>\n<p>\u58f0\u660e\u65b9\u5f0f<\/p>\n<p>\u53cc\u5f15\u53f7<\/p>\n<p>\u5355\u5f15\u53f7<\/p>\n<p>\u6a21\u677f\u5b57\u7b26\u4e32(ES6\u65b0\u589e)<\/p>\n<pre><code class=\"language-css\">  content = `\n\u5927\u5bb6\u597d,\u6211\u662f${username}.\n\u5f88\u9ad8\u5174\u8ba4\u8bc6\u5927\u5bb6\n  \/\/\u591a\u884c\uff0c${}\u65b9\u5f0f \u5d4c\u5165\u53d8\u91cf\u3002 \u4f20\u7edf\u65b9\u5f0f\u53d8\u91cf\u5b57\u7b26\u4e32\u8fde\u63a5\u5fc5\u987b\u7528\u5b57\u7b26\u4e32\u8fde\u63a5\u7b26<\/code><\/pre>\n<p>\u5b57\u7b26\u4e32\u8fde\u63a5\u7b26<\/p>\n<pre><code class=\"language-css\"> `+`<\/code><\/pre>\n<p>\u8f6c\u4e49\u5b57\u7b26<\/p>\n<pre><code class=\"language-css\">\\b \u9000\u683c         \n\\f \u8d70\u7eb8\u6362\u9875     \n\\n \u6362\u884c         \n\\r \u56de\u8f66         \n\\t \u6c34\u5e73\u5236\u8868\u7b26    \n\\&#039; \u5355\u5f15\u53f7     \n\\&quot; \u53cc\u5f15\u53f7     \n\\\\ \u53cd\u659c\u6760  <\/code><\/pre>\n<h3>3\u3001\u5e03\u5c14\u503c<\/h3>\n<pre><code class=\"language-css\">let a = true\nlet b = false\nwhile (true) {\n}<\/code><\/pre>\n<h3>4\u3001 NULL\u548cUndefinded<\/h3>\n<pre><code class=\"language-css\">null \u8868\u793a\u672a\u5b9a\u4e49\u7684\u5bf9\u8c61\nundefined \u8868\u793a&quot;\u7f3a\u5c11\u503c&quot;<\/code><\/pre>\n<h2>\u56db\u3001\u6d41\u7a0b\u63a7\u5236\u8bed\u53e5<\/h2>\n<h3>1\u3001\u6761\u4ef6\u8bed\u53e5(\u5206\u652f\u7ed3\u6784)<\/h3>\n<p>\u5355\u5411\u5206\u652f if<\/p>\n<pre><code class=\"language-javascript\">if (\u8868\u8fbe\u5f0f) {\n    code...\n}<\/code><\/pre>\n<p>\u53cc\u5411\u5206\u652f if...else<\/p>\n<pre><code class=\"language-javascript\">if (\u8868\u8fbe\u5f0f) {\n    code...\n} else {\n    code...\n}<\/code><\/pre>\n<p>\u591a\u5411\u5206\u652f if... else if<\/p>\n<pre><code class=\"language-javascript\">if (\u8868\u8fbe\u5f0f) {\n    code...\n} else if (\u8868\u8fbe\u5f0f) {\n    code...\n} else if (\u8868\u8fbe\u5f0f) {\n    code...\n} else {\n    code...\n}<\/code><\/pre>\n<p>\u591a\u5411\u5206\u652f switch...case<\/p>\n<pre><code class=\"language-javascript\">switch (\u8868\u8fbe\u5f0f) {\n    case \u8868\u8fbe\u5f0f\u53ef\u80fd\u7684\u503c: code....; break;\n    case \u8868\u8fbe\u5f0f\u53ef\u80fd\u7684\u503c: code....; break;\n    case \u8868\u8fbe\u5f0f\u53ef\u80fd\u7684\u503c: code....; break;\n    case \u8868\u8fbe\u5f0f\u53ef\u80fd\u7684\u503c: code....; break;\n    default: code....;\n}<\/code><\/pre>\n<p>\u5206\u652f\u7ed3\u6784\u5d4c\u5957<\/p>\n<pre><code class=\"language-javascript\">if (\u8868\u8fbe\u5f0f) {\n    if (\u8868\u8fbe\u5f0f) {\n        code....\n    }\n    code ...\n} else {\n    code...\n}<\/code><\/pre>\n<h3>2\u3001\u5faa\u73af<\/h3>\n<p>while \u5faa\u73af<\/p>\n<pre><code class=\"language-javascript\">while (\u5faa\u73af\u6761\u4ef6) {\n    code...\n}<\/code><\/pre>\n<p>do...while\u5faa\u73af<\/p>\n<pre><code class=\"language-javascript\">do {\n    code...\n} while (\u5faa\u73af\u6761\u4ef6)<\/code><\/pre>\n<p>```for \u5faa\u73af<\/p>\n<pre><code class=\"language-javascript\">for (\u5faa\u73af\u53d8\u91cf; \u5faa\u73af\u6761\u4ef6; \u5faa\u73af\u53d8\u91cf\u53d8\u5316) {\n    code ...<\/code><\/pre>\n<p>for...in\u5faa\u73af<\/p>\n<pre><code class=\"language-javascript\">var obj = {name:&#039;JIM&#039;, age:20}\nfor (k in obj) {\n    console.log(k, obj[k])\n}\n\/\/for...in \u53ef\u4ee5\u904d\u5386 javaScript \u7684\u5bf9\u8c61\u7c7b\u578b,\u4e00\u5207\u7686\u5bf9\u8c61<\/code><\/pre>\n<p>for...of \u5faa\u73af (ES6\u65b0\u589e)<\/p>\n<pre><code class=\"language-javascript\">var list = [10,20,304,405,3]\nfor (v of list) {\n    console.log(v)\n}\n\/\/\u7528\u4e8e\u904d\u5386JavaScript\u4e2d\u7684\u53ef\u8fed\u4ee3\u7c7b\u578b(Iterable) \u4e3b\u8981\u5305\u62ec \u6570\u7ec4\u3001\u7c7b\u6570\u7ec4\u5bf9\u8c61\u3001\u5b57\u7b26\u4e32\u3001Map\u3001Set\u3001Anguments\u3001NodeList\u7b49<\/code><\/pre>\n<h2>\u4e94\u3001JavaScript\u51fd\u6570<\/h2>\n<h3>1\u3001\u51fd\u6570\u7684\u5b9a\u4e49\u4e0e\u8c03\u7528\uff08\u4e0epython\u7c7b\u540c\uff09<\/h3>\n<pre><code class=\"language-javascript\">\/\/ \u65e0\u53c2\u51fd\u6570\nfunction f1() {\n  console.log(&quot;Hello world!&quot;);\n};\nf1();\n\n\/\/ \u6709\u53c2\u6570\u51fd\u6570\nfunction f2(a, b) {\n  console.log(arguments);  \/\/ \u5185\u7f6e\u7684arguments\u5bf9\u8c61\n  console.log(arguments.length);\n\n  console.log(arguments[0],arguments[1]);\n  console.log(a, b);\n};\nf2(10,20);\n\n\/\/ \u5e26\u8fd4\u56de\u503c\u7684\u51fd\u6570\nfunction sum(a, b){\n  return a + b;\n}\nsum(1, 2);  \/\/ \u8c03\u7528\u51fd\u6570\n\n\/\/ \u533f\u540d\u51fd\u6570\nvar sum = function(a, b){\n  return a + b;\n}\nsum(1, 2);\n\n\/\/ \u7acb\u5373\u6267\u884c\u51fd\u6570\n(function(a, b){\n  return a + b;\n})(1, 2);<\/code><\/pre>\n<h3>2\u3001\u51fd\u6570\u4e2d\u7684arguments\u53c2\u6570<\/h3>\n<p>\u4ee3\u7801<\/p>\n<pre><code class=\"language-javascript\">function add(a,b){\n  console.log(a+b);\n  console.log(arguments.length)\n}\nadd(1,2)<\/code><\/pre>\n<p>\u8f93\u51fa<\/p>\n<pre><code class=\"language-javascript\">3\n2<\/code><\/pre>\n<p>\u6ce8\u610f\uff1a<\/p>\n<pre><code class=\"language-css\">\u51fd\u6570\u53ea\u80fd\u8fd4\u56de\u4e00\u4e2a\u503c\uff0c\u5982\u679c\u8981\u8fd4\u56de\u591a\u4e2a\u503c\uff0c\u53ea\u80fd\u5c06\u5176\u653e\u5728\u6570\u7ec4\u6216\u5bf9\u8c61\u4e2d\u8fd4\u56de\u3002<\/code><\/pre>\n<h3>3\u3001\u51fd\u6570\u7684\u5168\u5c40\u53d8\u91cf\u548c\u5c40\u90e8\u53d8\u91cf<\/h3>\n<p>\u5c40\u90e8\u53d8\u91cf\uff1a<\/p>\n<p>\u5728JavaScript\u51fd\u6570\u5185\u90e8\u58f0\u660e\u7684\u53d8\u91cf\uff08\u4f7f\u7528 var\uff09\u662f\u5c40\u90e8\u53d8\u91cf\uff0c\u6240\u4ee5\u53ea\u80fd\u5728\u51fd\u6570\u5185\u90e8\u8bbf\u95ee\u5b83\uff08\u8be5\u53d8\u91cf\u7684\u4f5c\u7528\u57df\u662f\u51fd\u6570\u5185\u90e8\uff09\u3002\u53ea\u8981\u51fd\u6570\u8fd0\u884c\u5b8c\u6bd5\uff0c\u5c40\u90e8\u53d8\u91cf\u5c31\u4f1a\u88ab\u5220\u9664\u3002<\/p>\n<p>\u5168\u5c40\u53d8\u91cf\uff1a<\/p>\n<p>\u5728\u51fd\u6570\u5916\u58f0\u660e\u7684\u53d8\u91cf\u662f\u5168\u5c40\u53d8\u91cf\uff0c\u7f51\u9875\u4e0a\u7684\u6240\u6709\u811a\u672c\u548c\u51fd\u6570\u90fd\u80fd\u8bbf\u95ee\u5b83\u3002<\/p>\n<p>\u53d8\u91cf\u751f\u5b58\u5468\u671f\uff1a<\/p>\n<p>JavaScript\u53d8\u91cf\u7684\u751f\u547d\u671f\u4ece\u5b83\u4eec\u88ab\u58f0\u660e\u7684\u65f6\u95f4\u5f00\u59cb\u3002<\/p>\n<p>\u5c40\u90e8\u53d8\u91cf\u4f1a\u5728\u51fd\u6570\u8fd0\u884c\u4ee5\u540e\u88ab\u5220\u9664\u3002<\/p>\n<p>\u5168\u5c40\u53d8\u91cf\u4f1a\u5728\u9875\u9762\u5173\u95ed\u540e\u88ab\u5220\u9664\u3002<\/p>\n<h2>\u516d\u3001\u4f5c\u7528\u57df<\/h2>\n<p>\u4f8b<\/p>\n<pre><code class=\"language-css\">var city = &quot;BeiJing&quot;;\nfunction f() {\n  var city = &quot;ShangHai&quot;;\n  function inner(){\n    var city = &quot;ShenZhen&quot;;\n    console.log(city);\n  }\n  inner();\n}\nf();  <\/code><\/pre>\n<p>\u8f93\u51fa\u7ed3\u679c\u662f\uff1f<\/p>\n<h2>\u4e03\u3001BOM\u4e0eDOM\u64cd\u4f5c<\/h2>\n<h3>1\u3001\u4ecb\u7ecd<\/h3>\n<p>BOM\uff1aBrowser Object Model\uff0c\u6d4f\u89c8\u5668\u5bf9\u8c61\u6a21\u578b\u3002BOM\u7684\u7ed3\u6784\u56fe\uff1a<\/p>\n<p><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='https:\/\/egonlin.com\/wp-content\/uploads\/2022\/04\/wps10.jpg'><img class=\"lazyload lazyload-style-2\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  data-original=\"https:\/\/egonlin.com\/wp-content\/uploads\/2022\/04\/wps10.jpg\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"\" \/><\/div><\/p>\n<p>\u4ece\u4e0a\u56fe\u4e2d\u53ef\u4ee5\u770b\u51fa:<\/p>\n<pre><code class=\"language-javascript\">1\u3001DOM\u5bf9\u8c61\u4e5f\u662fBOM\u7684\u4e00\u90e8\u5206\n2\u3001window\u5bf9\u8c61\u662fBOM\u7684\u9876\u5c42\uff08\u6838\u5fc3\uff09\u5bf9\u8c61 <\/code><\/pre>\n<p>\u9700\u8981\u6ce8\u610f\u7684\u662f<\/p>\n<pre><code class=\"language-javascript\">1\u3001\u5728\u8c03\u7528window\u5bf9\u8c61\u7684\u65b9\u6cd5\u548c\u5c5e\u6027\u65f6\uff0c\u53ef\u4ee5\u7701\u7565window\uff0c\u4f8b\u5982\uff1awindow.document.location\u53ef\u4ee5\u7b80\u5199\u4e3adocument.location\n2\u3001\u5168\u5c40\u53d8\u91cf\u4e5f\u662fwindows\u5bf9\u8c61\u7684\u5c5e\u6027\uff0c\u5168\u5c40\u7684\u51fd\u6570\u65f6window\u5bf9\u8c61\u7684\u65b9\u6cd5.<\/code><\/pre>\n<h3>2\u3001location\u5bf9\u8c61<\/h3>\n<p>\u4ee3\u7801<\/p>\n<pre><code class=\"language-javascript\">location.href  \/\/\u83b7\u53d6URL\nlocation.href=&quot;URL&quot; \/\/ \u8df3\u8f6c\u5230\u6307\u5b9a\u9875\u9762\nlocation.reload() \/\/\u91cd\u65b0\u52a0\u8f7d\u9875\u9762<\/code><\/pre>\n<h3>3\u3001\u5f39\u51fa\u7cfb\u7edf\u5bf9\u8bdd\u6846<\/h3>\n<p>alert(1)\u662fwindow.alert(1)\u7684\u7b80\u5199\uff0c\u56e0\u4e3a\u5b83\u662fwindow\u7684\u5b50\u65b9\u6cd5\u3002<\/p>\n<p>\u7cfb\u7edf\u5bf9\u8bdd\u6846\u6709\u4e09\u79cd\uff1a<\/p>\n<pre><code class=\"language-javascript\">alert(&quot;egon\u8b66\u544a\u4f60\uff1a\u4eba\u4e11\u8fd8\u4e0d\u8bfb\u4e66\uff0c\u662f\u627e\u4e0d\u5230\u5973\u670b\u53cb\u7684&quot;); \/\/\u4e0d\u540c\u6d4f\u89c8\u5668\u4e2d\u7684\u5916\u89c2\u662f\u4e0d\u4e00\u6837\u7684\nconfirm(&quot;\u4f60\u771f\u7684\u8981\u8fd9\u4e48\u505a\u5417\u5c0f\u4f19\u5b50&quot;);  \/\/\u517c\u5bb9\u4e0d\u597d\nprompt(&quot;\u8f93\u5165\u7528\u6237\u540d\uff1a&quot;);   \/\/\u4e0d\u63a8\u8350\u4f7f\u7528<\/code><\/pre>\n<p>\u793a\u4f8b<\/p>\n<pre><code class=\"language-javascript\">var x=confirm(&quot;\u4f60\u771f\u5230\u8981\u8fd9\u4e48\u505a\u5417&quot;)\nconsole.log(x)\nvar username=prompt(&quot;\u8f93\u5165\u7528\u6237\u540d\uff1a&quot;)\nconsole.log(username);<\/code><\/pre>\n<h3>4\u3001DOM\u64cd\u4f5c<\/h3>\n<p>\u5f53\u7f51\u9875\u88ab\u52a0\u8f7d\u65f6\uff0c\u6d4f\u89c8\u5668\u4f1a\u521b\u5efa\u9875\u9762\u7684\u6587\u6863\u5bf9\u8c61\u6a21\u578b\uff08Document Object Model\uff09,DOM\u6807\u51c6\u89c4\u5b9aHTML\u6587\u6863\u4e2d\u7684\u6bcf\u4e2a\u6210\u5458\u90fd\u662f\u4e00\u4e2a\u8282\u70b9(node)\uff0cHTML DOM\u6811\u5982\u4e0b\u56fe<\/p>\n<p><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='https:\/\/egonlin.com\/wp-content\/uploads\/2022\/04\/wps11.jpg'><img class=\"lazyload lazyload-style-2\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  data-original=\"https:\/\/egonlin.com\/wp-content\/uploads\/2022\/04\/wps11.jpg\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"\" \/><\/div><\/p>\n<h4>1.\u76f4\u63a5\u67e5\u627e<\/h4>\n<pre><code class=\"language-javascript\">document.getElementById                 #\u6839\u636eID\u83b7\u53d6\u552f\u4e00\u4e00\u4e2a\u6807\u7b7e\ndocument.getElementsByClassName   #\u6839\u636eclass\u5c5e\u6027\u83b7\u53d6\u4e00\u7cfb\u5217\u6807\u7b7e\ndocument.getElementsByTagName     #\u6839\u636e\u6807\u7b7e\u540d\u83b7\u53d6\u4e00\u7cfb\u5217\u6807\u7b7e<\/code><\/pre>\n<h4>2.\u95f4\u63a5\u67e5\u627e\u5982\u4e0b\u8868<\/h4>\n<table>\n<thead>\n<tr>\n<th><strong><em>*\u8bed\u6cd5*<\/em><\/strong><\/th>\n<th><strong><em>*\u542b\u4e49*<\/em><\/strong><\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>childNodes<\/td>\n<td>\u83b7\u53d6\u6240\u6709\u7684\u5b50\u8282\u70b9\uff0c\u9664\u4e86\u5143\u7d20\u8fd8\u6709\u6587\u672c\u7b49<\/td>\n<\/tr>\n<tr>\n<td>children<\/td>\n<td>\u83b7\u53d6\u6240\u6709\u5143\u7d20\u5b50\u8282\u70b9\uff0c\u4e0d\u5305\u542b\u6587\u672c<\/td>\n<\/tr>\n<tr>\n<td>parentNode<\/td>\n<td>\u83b7\u53d6\u7236\u8282\u70b9<\/td>\n<\/tr>\n<tr>\n<td>previousSibling<\/td>\n<td>\u83b7\u53d6\u4e0a\u4e00\u4e2a\u5144\u5f1f\u8282\u70b9\uff0c\u5305\u542b\u6587\u672c<\/td>\n<\/tr>\n<tr>\n<td>previousElementSibling<\/td>\n<td>\u83b7\u53d6\u4e0a\u4e00\u4e2a\u5144\u5f1f\u5143\u7d20\u8282\u70b9\uff0c\u4e0d\u5305\u542b\u6587\u672c<\/td>\n<\/tr>\n<tr>\n<td>nextSibling<\/td>\n<td>\u83b7\u53d6\u4e0b\u4e00\u4e2a\u5144\u5f1f\u8282\u70b9\uff0c\u5305\u542b\u6587\u672c<\/td>\n<\/tr>\n<tr>\n<td>nextElementSibling<\/td>\n<td>\u83b7\u53d6\u4e0b\u4e00\u4e2a\u5144\u5f1f\u5143\u7d20\u8282\u70b9\uff0c\u4e0d\u5305\u542b\u6587\u672c<\/td>\n<\/tr>\n<tr>\n<td>firstChild<\/td>\n<td>\u83b7\u53d6\u7b2c\u4e00\u4e2a\u5b50\u8282\u70b9\uff0c\u5305\u542b\u6587\u672c<\/td>\n<\/tr>\n<tr>\n<td>firstElementChild<\/td>\n<td>\u83b7\u53d6\u7b2c\u4e00\u4e2a\u5b50\u8282\u70b9\uff0c\u4e0d\u5305\u542b\u6587\u672c<\/td>\n<\/tr>\n<tr>\n<td>lastChild<\/td>\n<td>\u83b7\u53d6\u6700\u540e\u4e00\u4e2a\u5b50\u8282\u70b9\uff0c\u5305\u542b\u6587\u672c<\/td>\n<\/tr>\n<tr>\n<td>lastElementChild<\/td>\n<td>\u83b7\u53d6\u7236\u5143\u7d20\u6700\u540e\u4e00\u4e2a\u5143\u7d20\u8282\u70b9\u3002\u4e0d\u5305\u542b\u6587\u672c<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h4>3.\u589e\u52a0\u8282\u70b9<\/h4>\n<p>\u521b\u5efa\u65b0\u8282\u70b9<\/p>\n<pre><code class=\"language-javascript\">var divEle = document.createElement(&#039;div&#039;);<\/code><\/pre>\n<p>\u8ffd\u52a0\u4e00\u4e2a\u5b50\u8282\u70b9\uff08\u653e\u5230\u6700\u540e\uff09<\/p>\n<pre><code class=\"language-javascript\">somenode.appendChild(\u65b0\u7684\u5b50\u8282\u70b9)\uff1b<\/code><\/pre>\n<p>\u63d2\u5165\u4e00\u4e2a\u5b50\u8282\u70b9\uff08\u63d2\u5165\u5230\u67d0\u4e2a\u8282\u70b9\u524d\uff09<\/p>\n<pre><code class=\"language-javascript\">somenode.insertBefore(\u65b0\u7684\u5b50\u8282\u70b9,\u67d0\u4e2a\u8282\u70b9); <\/code><\/pre>\n<h4>4.\u5220\u9664\u3001\u66ff\u6362\u8282\u70b9<\/h4>\n<table>\n<thead>\n<tr>\n<th><strong><em>*\u8bed\u6cd5*<\/em><\/strong><\/th>\n<th><strong><em>*\u542b\u4e49*<\/em><\/strong><\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>childNodes<\/td>\n<td>\u83b7\u53d6\u6240\u6709\u7684\u5b50\u8282\u70b9\uff0c\u9664\u4e86\u5143\u7d20\u8fd8\u6709\u6587\u672c\u7b49<\/td>\n<\/tr>\n<tr>\n<td>children<\/td>\n<td>\u83b7\u53d6\u6240\u6709\u5143\u7d20\u5b50\u8282\u70b9\uff0c\u4e0d\u5305\u542b\u6587\u672c<\/td>\n<\/tr>\n<tr>\n<td>parentNode<\/td>\n<td>\u83b7\u53d6\u7236\u8282\u70b9<\/td>\n<\/tr>\n<tr>\n<td>previousSibling<\/td>\n<td>\u83b7\u53d6\u4e0a\u4e00\u4e2a\u5144\u5f1f\u8282\u70b9\uff0c\u5305\u542b\u6587\u672c<\/td>\n<\/tr>\n<tr>\n<td>previousElementSibling<\/td>\n<td>\u83b7\u53d6\u4e0a\u4e00\u4e2a\u5144\u5f1f\u5143\u7d20\u8282\u70b9\uff0c\u4e0d\u5305\u542b\u6587\u672c<\/td>\n<\/tr>\n<tr>\n<td>nextSibling<\/td>\n<td>\u83b7\u53d6\u4e0b\u4e00\u4e2a\u5144\u5f1f\u8282\u70b9\uff0c\u5305\u542b\u6587\u672c<\/td>\n<\/tr>\n<tr>\n<td>nextElementSibling<\/td>\n<td>\u83b7\u53d6\u4e0b\u4e00\u4e2a\u5144\u5f1f\u5143\u7d20\u8282\u70b9\uff0c\u4e0d\u5305\u542b\u6587\u672c<\/td>\n<\/tr>\n<tr>\n<td>firstChild<\/td>\n<td>\u83b7\u53d6\u7b2c\u4e00\u4e2a\u5b50\u8282\u70b9\uff0c\u5305\u542b\u6587\u672c<\/td>\n<\/tr>\n<tr>\n<td>firstElementChild<\/td>\n<td>\u83b7\u53d6\u7b2c\u4e00\u4e2a\u5b50\u8282\u70b9\uff0c\u4e0d\u5305\u542b\u6587\u672c<\/td>\n<\/tr>\n<tr>\n<td>lastChild<\/td>\n<td>\u83b7\u53d6\u6700\u540e\u4e00\u4e2a\u5b50\u8282\u70b9\uff0c\u5305\u542b\u6587\u672c<\/td>\n<\/tr>\n<tr>\n<td>lastElementChild<\/td>\n<td>\u83b7\u53d6\u7236\u5143\u7d20\u6700\u540e\u4e00\u4e2a\u5143\u7d20\u8282\u70b9\u3002\u4e0d\u5305\u542b\u6587\u672c<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<pre><code class=\"language-javascript\">somenode.removeChild(\u8981\u5220\u9664\u7684\u5b50\u8282\u70b9)\uff1b\nsomenode.replaceChild(\u65b0\u7684\u5b50\u8282\u70b9, \u67d0\u4e2a\u5b50\u8282\u70b9); <\/code><\/pre>\n<h4>5.\u4fee\u6539\/\u8bbe\u7f6e\u8282\u70b9\u5c5e\u6027<\/h4>\n<p>\u83b7\u53d6\u6587\u672c\u8282\u70b9\u7684\u503c\uff1a<\/p>\n<pre><code class=\"language-javascript\">var divEle = document.getElementById(&quot;d1&quot;)\ndivEle.innerText\ndivEle.innerHTML<\/code><\/pre>\n<p>\u8bbe\u7f6e\u6587\u672c\u8282\u70b9\u7684\u503c\uff1a<\/p>\n<pre><code class=\"language-javascript\">var divEle = document.getElementById(&quot;d1&quot;)\ndivEle.innerText=&quot;1&quot;\ndivEle.innerHTML=&quot;&lt;p&gt;2&lt;\/p&gt;<\/code><\/pre>\n<p>attribute\u64cd\u4f5c<\/p>\n<pre><code class=\"language-javascript\">var divEle = document.getElementById(&quot;d1&quot;);\ndivEle.setAttribute(&quot;age&quot;,&quot;18&quot;)\ndivEle.getAttribute(&quot;age&quot;)\ndivEle.removeAttribute(&quot;age&quot;)<\/code><\/pre>\n<p>\u81ea\u5e26\u7684\u5c5e\u6027\u8fd8\u53ef\u4ee5\u76f4\u63a5.\u5c5e\u6027\u540d\u6765\u83b7\u53d6\u548c\u8bbe\u7f6e<\/p>\n<pre><code class=\"language-javascript\">imgEle.src\nimgEle.src=&quot;...&quot;<\/code><\/pre>\n<h4>6.\u83b7\u53d6\u5143\u7d20\u7684\u503c<\/h4>\n<p>\u9002\u7528\u4e8einput\u3001select\u3001textarea\u6807\u7b7e<\/p>\n<pre><code class=\"language-javascript\">var x=document.getElementById(&#039;input&#039;)\nvar y=document.getElementById(&#039;select&#039;)\nvar z=document.getElementById(&#039;textarea&#039;)\nx.value\ny.value\nz.value<\/code><\/pre>\n<h4>7.class\u64cd\u4f5c<\/h4>\n<pre><code class=\"language-javascript\">var x=document.getElementById(&#039;div1&#039;)\nx.classList.remove(&#039;col1&#039;)\nx.classList.add(&#039;col1&#039;)\nx.classList.contains(&#039;col1&#039;)\nx.classList.toggle(&#039;col1&#039;)<\/code><\/pre>\n<h4>8.css\u64cd\u4f5c<\/h4>\n<pre><code class=\"language-javascript\">obj.style.backgroundColor=&quot;red&quot;<\/code><\/pre>\n<p>JS\u64cd\u4f5cCSS\u5c5e\u6027\u7684\u89c4\u5f8b\uff1a<\/p>\n<p>\u5bf9\u4e8e\u6ca1\u6709\u4e2d\u6a2a\u7ebf\u7684CSS\u5c5e\u6027\u4e00\u822c\u76f4\u63a5\u4f7f\u7528style.\u5c5e\u6027\u540d\u5373\u53ef\u3002\u5982\uff1a<\/p>\n<pre><code class=\"language-javascript\">obj.style.margin\nobj.style.width\nobj.style.left\nobj.style.position<\/code><\/pre>\n<p>\u5bf9\u542b\u6709\u4e2d\u6a2a\u7ebf\u7684CSS\u5c5e\u6027\uff0c\u5c06\u4e2d\u6a2a\u7ebf\u540e\u9762\u7684\u7b2c\u4e00\u4e2a\u5b57\u6bcd\u6362\u6210\u5927\u5199\u5373\u53ef\u3002\u5982\uff1a<\/p>\n<pre><code class=\"language-javascript\">obj.style.marginTop\nobj.style.borderLeftWidth\nobj.style.zIndex\nobj.style.fontFamily<\/code><\/pre>\n<h4>9.\u4e8b\u4ef6<\/h4>\n<p>HTML 4.0 \u7684\u65b0\u7279\u6027\u4e4b\u4e00\u662f\u6709\u80fd\u529b\u4f7f HTML \u4e8b\u4ef6\u89e6\u53d1\u6d4f\u89c8\u5668\u4e2d\u7684\u52a8\u4f5c\uff08action\uff09\uff0c\u6bd4\u5982\u5f53\u7528\u6237\u70b9\u51fb\u67d0\u4e2a HTML \u5143\u7d20\u65f6\u6267\u884c\u4e00\u6bb5JavaScript\u3002\u4e0b\u9762\u662f\u4e00\u4e2a\u5c5e\u6027\u5217\u8868\uff0c\u8fd9\u4e9b\u5c5e\u6027\u53ef\u63d2\u5165 HTML \u6807\u7b7e\u6765\u5b9a\u4e49\u4e8b\u4ef6\u52a8\u4f5c\u3002<\/p>\n<p>1\u3001\u5e38\u7528\u4e8b\u4ef6<\/p>\n<pre><code class=\"language-javascript\">onclick        \u5f53\u7528\u6237\u70b9\u51fb\u67d0\u4e2a\u5bf9\u8c61\u65f6\u8c03\u7528\u7684\u4e8b\u4ef6\u53e5\u67c4\u3002\nondblclick     \u5f53\u7528\u6237\u53cc\u51fb\u67d0\u4e2a\u5bf9\u8c61\u65f6\u8c03\u7528\u7684\u4e8b\u4ef6\u53e5\u67c4\u3002\n\nonfocus        \u5143\u7d20\u83b7\u5f97\u7126\u70b9\u3002               \/\/ \u7ec3\u4e60\uff1a\u8f93\u5165\u6846\nonblur         \u5143\u7d20\u5931\u53bb\u7126\u70b9\u3002               \u5e94\u7528\u573a\u666f\uff1a\u7528\u4e8e\u8868\u5355\u9a8c\u8bc1,\u7528\u6237\u79bb\u5f00\u67d0\u4e2a\u8f93\u5165\u6846\u65f6,\u4ee3\u8868\u5df2\u7ecf\u8f93\u5165\u5b8c\u4e86,\u6211\u4eec\u53ef\u4ee5\u5bf9\u5b83\u8fdb\u884c\u9a8c\u8bc1.\nonchange       \u57df\u7684\u5185\u5bb9\u88ab\u6539\u53d8\u3002             \u5e94\u7528\u573a\u666f\uff1a\u901a\u5e38\u7528\u4e8e\u8868\u5355\u5143\u7d20,\u5f53\u5143\u7d20\u5185\u5bb9\u88ab\u6539\u53d8\u65f6\u89e6\u53d1.\uff08select\u8054\u52a8\uff09\n\nonkeydown      \u67d0\u4e2a\u952e\u76d8\u6309\u952e\u88ab\u6309\u4e0b\u3002          \u5e94\u7528\u573a\u666f: \u5f53\u7528\u6237\u5728\u6700\u540e\u4e00\u4e2a\u8f93\u5165\u6846\u6309\u4e0b\u56de\u8f66\u6309\u952e\u65f6,\u8868\u5355\u63d0\u4ea4.\nonkeypress     \u67d0\u4e2a\u952e\u76d8\u6309\u952e\u88ab\u6309\u4e0b\u5e76\u677e\u5f00\u3002\nonkeyup        \u67d0\u4e2a\u952e\u76d8\u6309\u952e\u88ab\u677e\u5f00\u3002\nonload         \u4e00\u5f20\u9875\u9762\u6216\u4e00\u5e45\u56fe\u50cf\u5b8c\u6210\u52a0\u8f7d\u3002\nonmousedown    \u9f20\u6807\u6309\u94ae\u88ab\u6309\u4e0b\u3002\nonmousemove    \u9f20\u6807\u88ab\u79fb\u52a8\u3002\nonmouseout     \u9f20\u6807\u4ece\u67d0\u5143\u7d20\u79fb\u5f00\u3002\nonmouseover    \u9f20\u6807\u79fb\u5230\u67d0\u5143\u7d20\u4e4b\u4e0a\u3002\n\nonselect      \u5728\u6587\u672c\u6846\u4e2d\u7684\u6587\u672c\u88ab\u9009\u4e2d\u65f6\u53d1\u751f\u3002\nonsubmit      \u786e\u8ba4\u6309\u94ae\u88ab\u70b9\u51fb\uff0c\u4f7f\u7528\u7684\u5bf9\u8c61\u662fform\u3002<\/code><\/pre>\n<p>\u7ed1\u5b9a\u65b9\u5f0f<\/p>\n<pre><code class=\"language-javascript\">#\u65b9\u5f0f\u4e00\uff1a\n&lt;div id=&quot;div1&quot; onclick=&quot;changeColor(this);&quot;&gt;\u6211\u662fdiv\uff0c\u6211\u53bb\u4f60\u59b9\u7684\uff0c\u70b9\u6211&lt;\/div&gt;\n&lt;script&gt;\n  function changeColor(ths) {\n    ths.style.backgroundColor=&quot;green&quot;;\n  }\n&lt;\/script&gt;\n\n\u6ce8\u610f\uff1a\nthis\u662f\u5b9e\u53c2\uff0c\u8868\u793a\u89e6\u53d1\u4e8b\u4ef6\u7684\u5f53\u524d\u5143\u7d20\u3002\n\u51fd\u6570\u5b9a\u4e49\u8fc7\u7a0b\u4e2d\u7684ths\u4e3a\u5f62\u53c2\u3002\n\n#\u65b9\u5f0f\u4e8c\uff1a\n&lt;div id=&quot;div1&quot;&gt;\u6765\uff0c\u70b9\u4eae\u6211\u7684\u7eff&lt;\/div&gt;\n&lt;script&gt;\n    var oDiv = document.getElementById(&#039;div1&#039;);\n    oDiv.onclick = function() {\n        this.style.backgroundColor = &#039;red&#039;;\n    }\n&lt;\/script&gt;<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"<p>JavaScript \u4e00\u3001JavaScript\u7b80\u4ecb JavaScript\uff0c\u901a\u5e38\u4f1a\u7b80\u79f0\u4e3a&#8217;JS&#038;#8 [&hellip;]<\/p>\n","protected":false},"author":3,"featured_media":6762,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":[],"categories":[3,404],"tags":[],"_links":{"self":[{"href":"https:\/\/egonlin.com\/index.php?rest_route=\/wp\/v2\/posts\/6086"}],"collection":[{"href":"https:\/\/egonlin.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/egonlin.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/egonlin.com\/index.php?rest_route=\/wp\/v2\/users\/3"}],"replies":[{"embeddable":true,"href":"https:\/\/egonlin.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=6086"}],"version-history":[{"count":0,"href":"https:\/\/egonlin.com\/index.php?rest_route=\/wp\/v2\/posts\/6086\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/egonlin.com\/index.php?rest_route=\/wp\/v2\/media\/6762"}],"wp:attachment":[{"href":"https:\/\/egonlin.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=6086"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/egonlin.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=6086"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/egonlin.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=6086"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}