{"id":1397,"date":"2025-02-08T00:14:51","date_gmt":"2025-02-07T16:14:51","guid":{"rendered":"https:\/\/www.laixuexila.com\/?p=1397"},"modified":"2025-02-08T00:14:53","modified_gmt":"2025-02-07T16:14:53","slug":"javascript-%e5%9f%ba%e7%a1%80%e7%9f%a5%e8%af%86%e6%95%99%e7%a8%8b%ef%bc%9a%e4%bb%8e%e9%9b%b6%e5%bc%80%e5%a7%8b%e5%ad%a6%e4%b9%a0%e8%af%ad%e6%b3%95%e5%92%8c%e6%95%b0%e6%8d%ae%e7%b1%bb%e5%9e%8b","status":"publish","type":"post","link":"https:\/\/www.laixuexila.com\/index.php\/2025\/02\/08\/javascript-%e5%9f%ba%e7%a1%80%e7%9f%a5%e8%af%86%e6%95%99%e7%a8%8b%ef%bc%9a%e4%bb%8e%e9%9b%b6%e5%bc%80%e5%a7%8b%e5%ad%a6%e4%b9%a0%e8%af%ad%e6%b3%95%e5%92%8c%e6%95%b0%e6%8d%ae%e7%b1%bb%e5%9e%8b\/","title":{"rendered":"JavaScript \u57fa\u7840\u77e5\u8bc6\u6559\u7a0b\uff1a\u4ece\u96f6\u5f00\u59cb\u5b66\u4e60\u8bed\u6cd5\u548c\u6570\u636e\u7c7b\u578b"},"content":{"rendered":"\n<h4 class=\"wp-block-heading\">\u4ecb\u7ecd\u4e0e\u5386\u53f2<\/h4>\n\n\n\n<p class=\"wp-block-paragraph\">JavaScript \u662f\u4e00\u79cd\u9ad8\u6548\u3001\u7075\u6d3b\u4e14\u5e7f\u6cdb\u5e94\u7528\u7684\u811a\u672c\u8bed\u8a00\uff0c\u6700\u521d\u7531 <strong>Netscape<\/strong> \u7684 Brendan Eich \u4e8e 1995 \u5e74\u5f00\u53d1\u3002\u5b83\u4e3b\u8981\u7528\u4e8e\u7f51\u9875\u7684\u52a8\u6001\u4ea4\u4e92\uff0c\u662f Web \u5f00\u53d1\u7684\u6838\u5fc3\u6280\u672f\u4e4b\u4e00\u3002\u867d\u7136\u540d\u5b57\u4e2d\u6709 \u201cJava\u201d\uff0c\u4f46 JavaScript \u548c Java \u5b8c\u5168\u662f\u4e0d\u540c\u7684\u4e24\u79cd\u8bed\u8a00\u3002<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Java \u4e0e JavaScript \u7684\u5173\u7cfb<\/strong>\uff1aJava \u662f\u4e00\u79cd\u9762\u5411\u5bf9\u8c61\u7684\u7f16\u7a0b\u8bed\u8a00\uff0c\u800c JavaScript \u662f\u4e00\u79cd\u57fa\u4e8e\u4e8b\u4ef6\u9a71\u52a8\u3001\u975e\u963b\u585e\u6a21\u578b\u7684\u52a8\u6001\u8bed\u8a00\u3002Java \u662f\u7528\u6765\u5f00\u53d1\u5927\u578b\u5e94\u7528\u7684\uff0c\u800c JavaScript \u4e3b\u8981\u7528\u4e8e\u5728\u6d4f\u89c8\u5668\u4e2d\u63d0\u4f9b\u52a8\u6001\u6548\u679c\u3002<\/li>\n\n\n\n<li><strong>JavaScript \u8fd0\u884c\u73af\u5883<\/strong>\uff1a<\/li>\n\n\n\n<li><strong>\u6d4f\u89c8\u5668<\/strong>\uff1aJavaScript \u6700\u521d\u662f\u8bbe\u8ba1\u7528\u6765\u5728\u7f51\u9875\u4e2d\u63d0\u4f9b\u4ea4\u4e92\u6027\uff0c\u73b0\u4ee3\u6d4f\u89c8\u5668\uff08\u5982 Chrome\u3001Firefox\u3001Safari \u7b49\uff09\u63d0\u4f9b\u4e86\u8fd0\u884c JavaScript \u7684\u73af\u5883\u3002<\/li>\n\n\n\n<li><strong>Node.js<\/strong>\uff1a\u968f\u7740\u6280\u672f\u53d1\u5c55\uff0cJavaScript \u4e0d\u4ec5\u9650\u4e8e\u6d4f\u89c8\u5668\u3002Node.js \u8ba9 JavaScript \u53ef\u4ee5\u5728\u670d\u52a1\u5668\u7aef\u8fd0\u884c\uff0c\u6784\u5efa\u9ad8\u6548\u7684\u540e\u7aef\u5e94\u7528\u7a0b\u5e8f\u3002<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h4 class=\"wp-block-heading\">\u57fa\u7840\u8bed\u6cd5<\/h4>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>\u53d8\u91cf\u58f0\u660e<\/strong>\uff1a<\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong><code>var<\/code><\/strong>\uff1a\u65e9\u671f JavaScript \u4f7f\u7528\u7684\u58f0\u660e\u65b9\u5f0f\uff0c\u5b58\u5728\u4f5c\u7528\u57df\u95ee\u9898\uff0c\u5df2\u4e0d\u63a8\u8350\u4f7f\u7528\u3002<\/li>\n\n\n\n<li><strong><code>let<\/code><\/strong>\uff1a\u5f15\u5165\u4e86\u5757\u7ea7\u4f5c\u7528\u57df\u7684\u58f0\u660e\u65b9\u5f0f\uff0c\u53ef\u4ee5\u907f\u514d <code>var<\/code> \u53ef\u80fd\u5bfc\u81f4\u7684\u4f5c\u7528\u57df\u95ee\u9898\u3002<\/li>\n\n\n\n<li><strong><code>const<\/code><\/strong>\uff1a\u5e38\u91cf\u58f0\u660e\uff0c\u58f0\u660e\u540e\u4e0d\u53ef\u91cd\u65b0\u8d4b\u503c\uff0c\u4fdd\u8bc1\u503c\u7684\u4e0d\u53ef\u53d8\u6027\u3002<\/li>\n<\/ul>\n\n\n\n<pre class=\"wp-block-code\"><code>   let age = 25;\n   const name = 'John';\n   var city = 'New York'; \/\/ \u4e0d\u63a8\u8350\u4f7f\u7528<\/code><\/pre>\n\n\n\n<ol start=\"2\" class=\"wp-block-list\">\n<li><strong>\u6570\u636e\u7c7b\u578b<\/strong>\uff1a<\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Number<\/strong>\uff1a\u6570\u5b57\u7c7b\u578b\uff0c\u5305\u62ec\u6574\u6570\u548c\u6d6e\u52a8\u5c0f\u6570\u3002<\/li>\n\n\n\n<li><strong>String<\/strong>\uff1a\u5b57\u7b26\u4e32\u7c7b\u578b\uff0c\u4f7f\u7528\u5355\u5f15\u53f7\u6216\u53cc\u5f15\u53f7\u5305\u88f9\u3002<\/li>\n\n\n\n<li><strong>Boolean<\/strong>\uff1a\u5e03\u5c14\u503c\u7c7b\u578b\uff0c\u53ea\u6709\u4e24\u4e2a\u503c\uff1a<code>true<\/code> \u6216 <code>false<\/code>\u3002<\/li>\n\n\n\n<li><strong>Null<\/strong>\uff1a\u8868\u793a\u65e0\u6548\u6216\u7a7a\u503c\u3002<\/li>\n\n\n\n<li><strong>Undefined<\/strong>\uff1a\u58f0\u660e\u4f46\u672a\u8d4b\u503c\u7684\u53d8\u91cf\u9ed8\u8ba4\u4e3a <code>undefined<\/code>\u3002<\/li>\n\n\n\n<li><strong>Symbol<\/strong>\uff1aES6 \u5f15\u5165\u7684\u552f\u4e00\u503c\u7c7b\u578b\u3002<\/li>\n\n\n\n<li><strong>Object<\/strong>\uff1a\u5bf9\u8c61\u7c7b\u578b\uff0c\u53ef\u4ee5\u5305\u542b\u591a\u4e2a\u503c\uff08\u5c5e\u6027\u548c\u65b9\u6cd5\uff09\u3002<\/li>\n<\/ul>\n\n\n\n<pre class=\"wp-block-code\"><code>   let age = 30; \/\/ Number\n   let name = \"Alice\"; \/\/ String\n   let isActive = true; \/\/ Boolean\n   let person = null; \/\/ Null\n   let address; \/\/ Undefined<\/code><\/pre>\n\n\n\n<ol start=\"3\" class=\"wp-block-list\">\n<li><strong>\u57fa\u672c\u64cd\u4f5c\u7b26<\/strong>\uff1a<\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>\u7b97\u672f\u64cd\u4f5c\u7b26<\/strong>\uff1a<code>+<\/code>, <code>-<\/code>, <code>*<\/code>, <code>\/<\/code>, <code>%<\/code>, <code>++<\/code>, <code>--<\/code><\/li>\n\n\n\n<li><strong>\u6bd4\u8f83\u64cd\u4f5c\u7b26<\/strong>\uff1a<code>==<\/code>, <code>===<\/code>, <code>!=<\/code>, <code>!==<\/code>, <code>&lt;<\/code>, <code>><\/code>, <code>&lt;=<\/code>, <code>>=<\/code><\/li>\n\n\n\n<li><strong>\u903b\u8f91\u64cd\u4f5c\u7b26<\/strong>\uff1a<code>&amp;&amp;<\/code> (\u4e0e), <code>||<\/code> (\u6216), <code>!<\/code> (\u975e)<\/li>\n<\/ul>\n\n\n\n<pre class=\"wp-block-code\"><code>   let sum = 5 + 3; \/\/ 8\n   let isEqual = 5 === 5; \/\/ true\n   let isValid = true &amp;&amp; false; \/\/ false<\/code><\/pre>\n\n\n\n<ol start=\"4\" class=\"wp-block-list\">\n<li><strong>\u6761\u4ef6\u8bed\u53e5<\/strong>\uff1a<\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong><code>if...else<\/code><\/strong>\uff1a\u6839\u636e\u6761\u4ef6\u5224\u65ad\u6267\u884c\u4e0d\u540c\u7684\u4ee3\u7801\u5757\u3002<\/li>\n\n\n\n<li><strong><code>switch<\/code><\/strong>\uff1a\u591a\u4e2a\u6761\u4ef6\u9009\u62e9\u7684\u7b80\u4fbf\u65b9\u6cd5\u3002<\/li>\n<\/ul>\n\n\n\n<pre class=\"wp-block-code\"><code>   let age = 20;\n   if (age &gt;= 18) {\n     console.log(\"Adult\");\n   } else {\n     console.log(\"Child\");\n   }\n\n   \/\/ switch \u793a\u4f8b\n   switch (age) {\n     case 20:\n       console.log(\"20 years old\");\n       break;\n     default:\n       console.log(\"Age not matched\");\n   }<\/code><\/pre>\n\n\n\n<ol start=\"5\" class=\"wp-block-list\">\n<li><strong>\u5faa\u73af\u7ed3\u6784<\/strong>\uff1a<\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong><code>for<\/code><\/strong>\uff1a\u7ecf\u5178\u7684\u8ba1\u6570\u5faa\u73af\u3002<\/li>\n\n\n\n<li><strong><code>while<\/code><\/strong>\uff1a\u5728\u6761\u4ef6\u4e3a\u771f\u65f6\u6267\u884c\u5faa\u73af\u3002<\/li>\n\n\n\n<li><strong><code>do...while<\/code><\/strong>\uff1a\u81f3\u5c11\u6267\u884c\u4e00\u6b21\u7684\u5faa\u73af\u3002<\/li>\n\n\n\n<li><strong><code>for...in<\/code><\/strong>\uff1a\u904d\u5386\u5bf9\u8c61\u7684\u5c5e\u6027\u3002<\/li>\n\n\n\n<li><strong><code>for...of<\/code><\/strong>\uff1a\u904d\u5386\u6570\u7ec4\u6216\u5176\u4ed6\u53ef\u8fed\u4ee3\u5bf9\u8c61\u7684\u503c\u3002<\/li>\n<\/ul>\n\n\n\n<pre class=\"wp-block-code\"><code>   \/\/ for \u5faa\u73af\n   for (let i = 0; i &lt; 5; i++) {\n     console.log(i); \/\/ 0, 1, 2, 3, 4\n   }\n\n   \/\/ for...in \u5faa\u73af\n   let person = { name: \"John\", age: 30 };\n   for (let key in person) {\n     console.log(key + \": \" + person&#91;key]);\n   }<\/code><\/pre>\n\n\n\n<ol start=\"6\" class=\"wp-block-list\">\n<li><strong>\u51fd\u6570\u7684\u58f0\u660e\u4e0e\u8c03\u7528<\/strong>\uff1a<\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>\u51fd\u6570\u58f0\u660e<\/strong>\uff1a\u901a\u8fc7 <code>function<\/code> \u5173\u952e\u5b57\u5b9a\u4e49\u51fd\u6570\u3002<\/li>\n\n\n\n<li><strong>\u51fd\u6570\u8c03\u7528<\/strong>\uff1a\u4f7f\u7528\u51fd\u6570\u540d\u52a0\u62ec\u53f7\u8c03\u7528\u3002<\/li>\n<\/ul>\n\n\n\n<pre class=\"wp-block-code\"><code>   function greet(name) {\n     console.log(\"Hello, \" + name);\n   }\n\n   greet(\"Alice\"); \/\/ \u8f93\u51fa: Hello, Alice<\/code><\/pre>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h4 class=\"wp-block-heading\">\u57fa\u7840\u6570\u636e\u7ed3\u6784<\/h4>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>\u6570\u7ec4<\/strong>\uff1a<\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>\u521b\u5efa\u6570\u7ec4<\/strong>\uff1a\u901a\u8fc7 <code>[]<\/code> \u521b\u5efa\u3002<\/li>\n\n\n\n<li><strong>\u8bbf\u95ee\u4e0e\u4fee\u6539<\/strong>\uff1a\u901a\u8fc7\u7d22\u5f15\u8bbf\u95ee\u6216\u4fee\u6539\u6570\u7ec4\u5143\u7d20\u3002<\/li>\n\n\n\n<li><strong>\u5e38\u7528\u6570\u7ec4\u65b9\u6cd5<\/strong>\uff1a<code>push()<\/code>, <code>pop()<\/code>, <code>shift()<\/code>, <code>unshift()<\/code>, <code>slice()<\/code>, <code>splice()<\/code> \u7b49\u3002<\/li>\n<\/ul>\n\n\n\n<pre class=\"wp-block-code\"><code>   let fruits = &#91;\"Apple\", \"Banana\", \"Cherry\"];\n   fruits.push(\"Orange\"); \/\/ \u6dfb\u52a0\u5143\u7d20\n   console.log(fruits&#91;0]); \/\/ \u8f93\u51fa: Apple\n   fruits.pop(); \/\/ \u79fb\u9664\u6700\u540e\u4e00\u4e2a\u5143\u7d20<\/code><\/pre>\n\n\n\n<ol start=\"2\" class=\"wp-block-list\">\n<li><strong>\u5bf9\u8c61<\/strong>\uff1a<\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>\u521b\u5efa\u5bf9\u8c61<\/strong>\uff1a\u4f7f\u7528 <code>{}<\/code> \u5b9a\u4e49\u3002<\/li>\n\n\n\n<li><strong>\u8bbf\u95ee\u4e0e\u4fee\u6539\u5c5e\u6027<\/strong>\uff1a\u901a\u8fc7\u70b9\u64cd\u4f5c\u7b26\u6216\u65b9\u62ec\u53f7\u8bed\u6cd5\u3002<\/li>\n\n\n\n<li><strong>\u5bf9\u8c61\u65b9\u6cd5<\/strong>\uff1a\u5bf9\u8c61\u53ef\u4ee5\u62e5\u6709\u51fd\u6570\u4f5c\u4e3a\u5c5e\u6027\u3002<\/li>\n<\/ul>\n\n\n\n<pre class=\"wp-block-code\"><code>   let person = {\n     name: \"John\",\n     age: 30,\n     greet: function() {\n       console.log(\"Hello, \" + this.name);\n     }\n   };\n\n   person.greet(); \/\/ \u8f93\u51fa: Hello, John<\/code><\/pre>\n\n\n\n<ol start=\"3\" class=\"wp-block-list\">\n<li><strong>\u5b57\u7b26\u4e32<\/strong>\uff1a<\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>\u5e38\u7528\u5b57\u7b26\u4e32\u65b9\u6cd5<\/strong>\uff1a<code>slice()<\/code>, <code>substring()<\/code>, <code>charAt()<\/code>, <code>split()<\/code>, <code>toUpperCase()<\/code>, <code>toLowerCase()<\/code> \u7b49\u3002<\/li>\n<\/ul>\n\n\n\n<pre class=\"wp-block-code\"><code>   let str = \"JavaScript\";\n   console.log(str.slice(0, 4)); \/\/ \"Java\"\n   console.log(str.charAt(5)); \/\/ \"S\"\n   console.log(str.split(\"\")); \/\/ &#91;\"J\", \"a\", \"v\", \"a\", \"S\", \"c\", \"r\", \"i\", \"p\", \"t\"]<\/code><\/pre>\n\n\n\n<ol start=\"4\" class=\"wp-block-list\">\n<li><strong>JSON \u5904\u7406<\/strong>\uff1a<\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong><code>JSON.parse()<\/code><\/strong>\uff1a\u5c06 JSON \u5b57\u7b26\u4e32\u8f6c\u6362\u4e3a\u5bf9\u8c61\u3002<\/li>\n\n\n\n<li><strong><code>JSON.stringify()<\/code><\/strong>\uff1a\u5c06\u5bf9\u8c61\u8f6c\u6362\u4e3a JSON \u5b57\u7b26\u4e32\u3002<\/li>\n<\/ul>\n\n\n\n<pre class=\"wp-block-code\"><code>   let jsonString = '{\"name\": \"Alice\", \"age\": 25}';\n   let obj = JSON.parse(jsonString);\n   console.log(obj.name); \/\/ \"Alice\"\n\n   let jsonObject = { name: \"Bob\", age: 30 };\n   let jsonStr = JSON.stringify(jsonObject);\n   console.log(jsonStr); \/\/ '{\"name\":\"Bob\",\"age\":30}'<\/code><\/pre>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">\u5c0f\u7ed3<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">JavaScript \u662f\u4e00\u95e8\u975e\u5e38\u5f3a\u5927\u4e14\u7075\u6d3b\u7684\u8bed\u8a00\uff0c\u638c\u63e1\u57fa\u7840\u8bed\u6cd5\u3001\u6570\u636e\u7ed3\u6784\u53ca\u5e38\u7528\u65b9\u6cd5\u662f\u7f16\u5199\u9ad8\u6548\u3001\u53ef\u9760\u4ee3\u7801\u7684\u57fa\u7840\u3002\u901a\u8fc7\u672c\u90e8\u5206\u5185\u5bb9\u7684\u5b66\u4e60\uff0c\u4f60\u5df2\u7ecf\u80fd\u591f\u7406\u89e3 JavaScript \u7684\u57fa\u672c\u8bed\u6cd5\u3001\u53d8\u91cf\u58f0\u660e\u3001\u6570\u636e\u7c7b\u578b\u3001\u63a7\u5236\u6d41\u7ed3\u6784\u53ca\u5e38\u7528\u6570\u636e\u7ed3\u6784\uff08\u5982\u6570\u7ec4\u548c\u5bf9\u8c61\uff09\uff0c\u4e3a\u540e\u7eed\u6df1\u5165\u5b66\u4e60\u548c\u5b9e\u9645\u5f00\u53d1\u6253\u4e0b\u4e86\u575a\u5b9e\u7684\u57fa\u7840\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u4ecb\u7ecd\u4e0e\u5386\u53f2 JavaScript \u662f\u4e00\u79cd\u9ad8\u6548\u3001\u7075\u6d3b\u4e14\u5e7f\u6cdb\u5e94\u7528\u7684\u811a\u672c\u8bed\u8a00\uff0c\u6700\u521d\u7531 Netscape \u7684 Bren [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[46],"tags":[],"class_list":["post-1397","post","type-post","status-publish","format-standard","hentry","category-javascript"],"_links":{"self":[{"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/posts\/1397","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/comments?post=1397"}],"version-history":[{"count":2,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/posts\/1397\/revisions"}],"predecessor-version":[{"id":1416,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/posts\/1397\/revisions\/1416"}],"wp:attachment":[{"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/media?parent=1397"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/categories?post=1397"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/tags?post=1397"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}