{"id":2085,"date":"2025-02-26T23:45:48","date_gmt":"2025-02-26T15:45:48","guid":{"rendered":"https:\/\/www.laixuexila.com\/?p=2085"},"modified":"2025-02-26T23:45:48","modified_gmt":"2025-02-26T15:45:48","slug":"javascript-%e4%bb%a3%e7%a0%81%e8%a7%84%e8%8c%83","status":"publish","type":"post","link":"https:\/\/www.laixuexila.com\/index.php\/2025\/02\/26\/javascript-%e4%bb%a3%e7%a0%81%e8%a7%84%e8%8c%83\/","title":{"rendered":"JavaScript \u4ee3\u7801\u89c4\u8303"},"content":{"rendered":"\n<p>\u9075\u5faa\u4e00\u81f4\u7684\u4ee3\u7801\u89c4\u8303\u80fd\u591f\u63d0\u9ad8\u4ee3\u7801\u7684\u53ef\u8bfb\u6027\u3001\u53ef\u7ef4\u62a4\u6027\uff0c\u5e76\u5e2e\u52a9\u5f00\u53d1\u8005\u4fdd\u6301\u4e00\u81f4\u7684\u7f16\u7a0b\u98ce\u683c\u3002JavaScript \u7684\u4ee3\u7801\u89c4\u8303\u5e76\u6ca1\u6709\u7edf\u4e00\u7684\u6807\u51c6\uff0c\u4e0d\u540c\u7684\u56e2\u961f\u6216\u9879\u76ee\u4f1a\u6709\u4e0d\u540c\u7684\u7ea6\u5b9a\u3002\u4ee5\u4e0b\u662f\u4e00\u4e9b\u5e38\u89c1\u7684 JavaScript \u4ee3\u7801\u89c4\u8303\u548c\u6700\u4f73\u5b9e\u8df5\uff1a<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>1. \u53d8\u91cf\u58f0\u660e<\/strong><\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>\u4f7f\u7528 <code>let<\/code> \u548c <code>const<\/code><\/strong>\uff1a\u907f\u514d\u4f7f\u7528 <code>var<\/code>\uff0c\u56e0\u4e3a <code>var<\/code> \u4f1a\u5f15\u5165\u53d8\u91cf\u63d0\u5347\u7684\u95ee\u9898\uff0c\u800c <code>let<\/code> \u548c <code>const<\/code> \u5177\u6709\u66f4\u660e\u786e\u7684\u4f5c\u7528\u57df\u89c4\u5219\u3002<\/li>\n\n\n\n<li>\u4f7f\u7528 <code>const<\/code> \u6765\u58f0\u660e\u4e0d\u4f1a\u6539\u53d8\u7684\u53d8\u91cf\u3002<\/li>\n\n\n\n<li>\u4f7f\u7528 <code>let<\/code> \u6765\u58f0\u660e\u4f1a\u6539\u53d8\u7684\u53d8\u91cf\u3002<\/li>\n<\/ul>\n\n\n\n<pre class=\"wp-block-code\"><code>  const MAX_SIZE = 100;  \/\/ \u5e38\u91cf\uff0c\u4e0d\u4f1a\u6539\u53d8\n  let currentSize = 50;  \/\/ \u53d8\u91cf\uff0c\u503c\u4f1a\u6539\u53d8<\/code><\/pre>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>\u547d\u540d\u89c4\u5219<\/strong>\uff1a\u4f7f\u7528\u5c0f\u5199\u5b57\u6bcd\u52a0\u4e0b\u5212\u7ebf\uff08snake_case\uff09\u6216\u9a7c\u5cf0\u5f0f\u547d\u540d\u6cd5\uff08camelCase\uff09\u6765\u547d\u540d\u53d8\u91cf\u3002\u5e38\u91cf\u4f7f\u7528\u5927\u5199\u5b57\u6bcd\u548c\u4e0b\u5212\u7ebf\u3002<\/li>\n<\/ul>\n\n\n\n<pre class=\"wp-block-code\"><code>  let firstName = \"John\";\n  const MAX_HEIGHT = 200;<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>2. \u51fd\u6570\u547d\u540d<\/strong><\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>\u51fd\u6570\u547d\u540d<\/strong>\uff1a\u51fd\u6570\u540d\u5e94\u8be5\u7b80\u6d01\u3001\u5177\u6709\u63cf\u8ff0\u6027\uff0c\u901a\u5e38\u91c7\u7528\u9a7c\u5cf0\u5f0f\u547d\u540d\u6cd5\uff0c\u4e14\u52a8\u8bcd\u5e94\u8be5\u4f4d\u4e8e\u51fd\u6570\u540d\u5f00\u5934\u3002<\/li>\n<\/ul>\n\n\n\n<pre class=\"wp-block-code\"><code>  function calculateTotalPrice() {\n    \/\/ \u51fd\u6570\u903b\u8f91\n  }\n\n  function getUserInfo() {\n    \/\/ \u51fd\u6570\u903b\u8f91\n  }<\/code><\/pre>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>\u7bad\u5934\u51fd\u6570<\/strong>\uff1a\u5bf9\u4e8e\u7b80\u77ed\u7684\u51fd\u6570\uff0c\u5c3d\u91cf\u4f7f\u7528\u7bad\u5934\u51fd\u6570\u6765\u51cf\u5c11\u4ee3\u7801\u91cf\u3002<\/li>\n<\/ul>\n\n\n\n<pre class=\"wp-block-code\"><code>  \/\/ \u666e\u901a\u51fd\u6570\n  function add(a, b) {\n    return a + b;\n  }\n\n  \/\/ \u7bad\u5934\u51fd\u6570\n  const add = (a, b) =&gt; a + b;<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>3. \u7a7a\u683c\u548c\u7f29\u8fdb<\/strong><\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>\u7f29\u8fdb<\/strong>\uff1a\u4f7f\u7528\u4e24\u4e2a\u7a7a\u683c\u6216\u56db\u4e2a\u7a7a\u683c\u8fdb\u884c\u7f29\u8fdb\uff08\u63a8\u8350\u4f7f\u7528\u4e24\u4e2a\u7a7a\u683c\uff09\u3002\u4e0d\u8981\u4f7f\u7528 Tab \u5b57\u7b26\u8fdb\u884c\u7f29\u8fdb\u3002<\/li>\n<\/ul>\n\n\n\n<pre class=\"wp-block-code\"><code>  function add(a, b) {\n    return a + b;\n  }<\/code><\/pre>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>\u64cd\u4f5c\u7b26\u5468\u56f4\u7684\u7a7a\u683c<\/strong>\uff1a\u64cd\u4f5c\u7b26\u524d\u540e\u52a0\u7a7a\u683c\uff0c\u4f7f\u5f97\u4ee3\u7801\u66f4\u6613\u8bfb\u3002<\/li>\n<\/ul>\n\n\n\n<pre class=\"wp-block-code\"><code>  let sum = a + b;\n  let difference = a - b;<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>4. \u82b1\u62ec\u53f7\u7684\u4f7f\u7528<\/strong><\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>\u82b1\u62ec\u53f7<\/strong>\uff1a\u5373\u4f7f\u4ee3\u7801\u5757\u53ea\u6709\u4e00\u884c\uff0c\u4e5f\u5e94\u8be5\u59cb\u7ec8\u4f7f\u7528\u82b1\u62ec\u53f7 <code>{}<\/code> \u6765\u5305\u88f9\u4ee3\u7801\u5757\uff0c\u8fd9\u6709\u52a9\u4e8e\u907f\u514d\u9519\u8bef\u548c\u63d0\u9ad8\u53ef\u8bfb\u6027\u3002<\/li>\n<\/ul>\n\n\n\n<pre class=\"wp-block-code\"><code>  if (x &gt; 10) {\n    console.log(\"x is greater than 10\");\n  }<\/code><\/pre>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>\u5355\u884c\u8bed\u53e5<\/strong>\uff1a\u5982\u679c\u53ea\u6709\u4e00\u884c\u8bed\u53e5\uff0c\u53ef\u4ee5\u5c06\u82b1\u62ec\u53f7\u5199\u5728\u540c\u4e00\u884c\u3002<\/li>\n<\/ul>\n\n\n\n<pre class=\"wp-block-code\"><code>  if (x &gt; 10) console.log(\"x is greater than 10\");<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>5. \u5b57\u7b26\u4e32<\/strong><\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>\u5b57\u7b26\u4e32\u5f15\u53f7<\/strong>\uff1a\u5efa\u8bae\u4f7f\u7528\u5355\u5f15\u53f7 <code>'<\/code> \u6216\u6a21\u677f\u5b57\u7b26\u4e32 <code>`<\/code>\uff0c\u5c3d\u91cf\u907f\u514d\u4f7f\u7528\u53cc\u5f15\u53f7 <code>\"<\/code>, \u9664\u975e\u7279\u6b8a\u60c5\u51b5\u3002<\/li>\n<\/ul>\n\n\n\n<pre class=\"wp-block-code\"><code>  let name = 'John';   \/\/ \u5355\u5f15\u53f7\n  let greeting = `Hello, ${name}`;  \/\/ \u6a21\u677f\u5b57\u7b26\u4e32<\/code><\/pre>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>\u6a21\u677f\u5b57\u7b26\u4e32<\/strong>\uff1a\u5bf9\u4e8e\u591a\u884c\u5b57\u7b26\u4e32\u6216\u5b57\u7b26\u4e32\u62fc\u63a5\uff0c\u4f7f\u7528\u6a21\u677f\u5b57\u7b26\u4e32\u3002<\/li>\n<\/ul>\n\n\n\n<pre class=\"wp-block-code\"><code>  let message = `Hello,\n  Welcome to JavaScript!`;<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>6. \u6ce8\u91ca<\/strong><\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>\u51fd\u6570\u548c\u590d\u6742\u4ee3\u7801\u5757<\/strong>\uff1a\u4e3a\u6bcf\u4e2a\u51fd\u6570\u548c\u590d\u6742\u7684\u4ee3\u7801\u5757\u6dfb\u52a0\u6ce8\u91ca\uff0c\u8bf4\u660e\u5176\u529f\u80fd\u548c\u5b9e\u73b0\u903b\u8f91\u3002<\/li>\n<\/ul>\n\n\n\n<pre class=\"wp-block-code\"><code>  \/\/ \u8ba1\u7b97\u603b\u4ef7\n  function calculateTotalPrice(items) {\n    let total = 0;\n    for (let item of items) {\n      total += item.price;\n    }\n    return total;\n  }<\/code><\/pre>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>\u5185\u8054\u6ce8\u91ca<\/strong>\uff1a\u5728\u884c\u5c3e\u4e3a\u590d\u6742\u6216\u4e0d\u76f4\u89c2\u7684\u4ee3\u7801\u6dfb\u52a0\u5185\u8054\u6ce8\u91ca\u3002<\/li>\n<\/ul>\n\n\n\n<pre class=\"wp-block-code\"><code>  let total = 0; \/\/ \u521d\u59cb\u5316\u603b\u4ef7\u4e3a0<\/code><\/pre>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>\u907f\u514d\u591a\u4f59\u7684\u6ce8\u91ca<\/strong>\uff1a\u4e0d\u9700\u8981\u4e3a\u660e\u663e\u7684\u4ee3\u7801\u6dfb\u52a0\u6ce8\u91ca\uff0c\u5982\u7b80\u5355\u7684\u8d4b\u503c\u64cd\u4f5c\u3002<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>7. \u6761\u4ef6\u8bed\u53e5<\/strong><\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>\u907f\u514d\u4f7f\u7528 <code>==<\/code> \u548c <code>!=<\/code><\/strong>\uff1a\u603b\u662f\u4f7f\u7528\u4e25\u683c\u76f8\u7b49 <code>===<\/code> \u548c\u4e25\u683c\u4e0d\u7b49 <code>!==<\/code>\uff0c\u907f\u514d\u9690\u5f0f\u7c7b\u578b\u8f6c\u6362\u5e26\u6765\u7684\u95ee\u9898\u3002<\/li>\n<\/ul>\n\n\n\n<pre class=\"wp-block-code\"><code>  if (x === 10) {\n    console.log(\"x is 10\");\n  }\n\n  if (y !== \"hello\") {\n    console.log(\"y is not hello\");\n  }<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>8. \u4ee3\u7801\u5757\u7684\u987a\u5e8f<\/strong><\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>\u51fd\u6570\u58f0\u660e\u4f4d\u7f6e<\/strong>\uff1a\u5c06\u51fd\u6570\u58f0\u660e\u653e\u5728\u4ee3\u7801\u7684\u9876\u90e8\uff0c\u8fd9\u6837\u53ef\u4ee5\u786e\u4fdd\u4ee3\u7801\u6309\u7167\u9884\u671f\u987a\u5e8f\u6267\u884c\u3002<\/li>\n<\/ul>\n\n\n\n<pre class=\"wp-block-code\"><code>  function myFunction() {\n    \/\/ function logic\n  }\n\n  myFunction();  \/\/ \u8c03\u7528\u51fd\u6570<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>9. \u907f\u514d\u4f7f\u7528\u5168\u5c40\u53d8\u91cf<\/strong><\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>\u51cf\u5c11\u5168\u5c40\u53d8\u91cf\u7684\u4f7f\u7528<\/strong>\uff1a\u5c3d\u91cf\u4f7f\u7528\u5c40\u90e8\u53d8\u91cf\uff0c\u907f\u514d\u6c61\u67d3\u5168\u5c40\u547d\u540d\u7a7a\u95f4\uff0c\u51cf\u5c11\u547d\u540d\u51b2\u7a81\u7684\u98ce\u9669\u3002\u901a\u8fc7 <code>let<\/code>, <code>const<\/code>, \u548c\u51fd\u6570\u4f5c\u7528\u57df\u6765\u9650\u5236\u53d8\u91cf\u7684\u4f5c\u7528\u8303\u56f4\u3002<\/li>\n<\/ul>\n\n\n\n<pre class=\"wp-block-code\"><code>  (function() {\n    let localVar = \"This is local\";\n    \/\/ \u5916\u90e8\u65e0\u6cd5\u8bbf\u95ee localVar\n  })();<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>10. \u9519\u8bef\u5904\u7406<\/strong><\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>\u9519\u8bef\u5904\u7406<\/strong>\uff1a\u4f7f\u7528 <code>try...catch<\/code> \u6765\u6355\u83b7\u53ef\u80fd\u7684\u9519\u8bef\uff0c\u786e\u4fdd\u7a0b\u5e8f\u4e0d\u4f1a\u56e0\u5c0f\u7684\u9519\u8bef\u800c\u5d29\u6e83\u3002<\/li>\n<\/ul>\n\n\n\n<pre class=\"wp-block-code\"><code>  try {\n    let result = riskyFunction();\n  } catch (error) {\n    console.error(\"An error occurred:\", error);\n  }<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>11. \u4f7f\u7528 ES6+ \u7279\u6027<\/strong><\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>\u6a21\u5757\u5316<\/strong>\uff1a\u4f7f\u7528 <code>import<\/code> \u548c <code>export<\/code> \u6765\u7ec4\u7ec7\u4ee3\u7801\uff0c\u907f\u514d\u5728\u5168\u5c40\u4f5c\u7528\u57df\u4e2d\u5b9a\u4e49\u5927\u91cf\u7684\u53d8\u91cf\u548c\u51fd\u6570\u3002<\/li>\n<\/ul>\n\n\n\n<pre class=\"wp-block-code\"><code>  \/\/ module.js\n  export function greet() {\n    console.log(\"Hello!\");\n  }\n\n  \/\/ main.js\n  import { greet } from '.\/module';\n  greet();<\/code><\/pre>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>\u89e3\u6784\u8d4b\u503c<\/strong>\uff1a\u4f7f\u7528\u89e3\u6784\u8d4b\u503c\u6765\u63d0\u53d6\u5bf9\u8c61\u548c\u6570\u7ec4\u4e2d\u7684\u503c\uff0c\u589e\u5f3a\u4ee3\u7801\u7684\u53ef\u8bfb\u6027\u3002<\/li>\n<\/ul>\n\n\n\n<pre class=\"wp-block-code\"><code>  const person = { name: \"John\", age: 25 };\n  const { name, age } = person;<\/code><\/pre>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>\u7bad\u5934\u51fd\u6570<\/strong>\uff1a\u4f7f\u7528\u7bad\u5934\u51fd\u6570\u7b80\u5316\u51fd\u6570\u8868\u8fbe\u5f0f\uff0c\u907f\u514d\u4f7f\u7528 <code>function<\/code> \u5173\u952e\u5b57\u3002<\/li>\n<\/ul>\n\n\n\n<pre class=\"wp-block-code\"><code>  const add = (a, b) =&gt; a + b;<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>12. \u4f7f\u7528\u5de5\u5177\u548c\u4ee3\u7801\u68c0\u67e5<\/strong><\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>\u4ee3\u7801\u683c\u5f0f\u5316\u5de5\u5177<\/strong>\uff1a\u4f7f\u7528\u5de5\u5177\u5982 <strong>Prettier<\/strong> \u6765\u81ea\u52a8\u683c\u5f0f\u5316\u4ee3\u7801\uff0c\u786e\u4fdd\u4e00\u81f4\u7684\u683c\u5f0f\u3002<\/li>\n\n\n\n<li><strong>\u4ee3\u7801\u8d28\u91cf\u5de5\u5177<\/strong>\uff1a\u4f7f\u7528 <strong>ESLint<\/strong> \u6216 <strong>JSHint<\/strong> \u6765\u68c0\u67e5\u4ee3\u7801\u7684\u6f5c\u5728\u95ee\u9898\uff0c\u786e\u4fdd\u9075\u5faa\u6700\u4f73\u5b9e\u8df5\u548c\u89c4\u8303\u3002<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>\u603b\u7ed3<\/strong><\/h3>\n\n\n\n<p>\u9075\u5faa\u4e00\u81f4\u7684 JavaScript \u4ee3\u7801\u89c4\u8303\u662f\u56e2\u961f\u5408\u4f5c\u548c\u957f\u671f\u7ef4\u62a4\u7684\u5173\u952e\u3002\u826f\u597d\u7684\u4ee3\u7801\u89c4\u8303\u4e0d\u4ec5\u53ef\u4ee5\u63d0\u5347\u4ee3\u7801\u7684\u53ef\u8bfb\u6027\u548c\u53ef\u7ef4\u62a4\u6027\uff0c\u8fd8\u80fd\u5e2e\u52a9\u5f00\u53d1\u8005\u51cf\u5c11\u9519\u8bef\u5e76\u63d0\u9ad8\u5f00\u53d1\u6548\u7387\u3002\u901a\u8fc7\u9075\u5faa\u53d8\u91cf\u547d\u540d\u3001\u51fd\u6570\u547d\u540d\u3001\u4ee3\u7801\u7f29\u8fdb\u3001\u9519\u8bef\u5904\u7406\u7b49\u6700\u4f73\u5b9e\u8df5\uff0c\u53ef\u4ee5\u786e\u4fdd\u4ee3\u7801\u5728\u56e2\u961f\u4e2d\u4e00\u81f4\u4e14\u6613\u4e8e\u7406\u89e3\u3002<\/p>\n\n\n\n<p>\u66f4\u591a\u8be6\u7ec6\u5185\u5bb9\u8bf7\u5173\u6ce8\u5176\u4ed6\u76f8\u5173\u6587\u7ae0\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u9075\u5faa\u4e00\u81f4\u7684\u4ee3\u7801\u89c4\u8303\u80fd\u591f\u63d0\u9ad8\u4ee3\u7801\u7684\u53ef\u8bfb\u6027\u3001\u53ef\u7ef4\u62a4\u6027\uff0c\u5e76\u5e2e\u52a9\u5f00\u53d1\u8005\u4fdd\u6301\u4e00\u81f4\u7684\u7f16\u7a0b\u98ce\u683c\u3002JavaScript \u7684\u4ee3\u7801 [&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-2085","post","type-post","status-publish","format-standard","hentry","category-javascript"],"_links":{"self":[{"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/posts\/2085","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=2085"}],"version-history":[{"count":1,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/posts\/2085\/revisions"}],"predecessor-version":[{"id":2086,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/posts\/2085\/revisions\/2086"}],"wp:attachment":[{"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/media?parent=2085"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/categories?post=2085"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/tags?post=2085"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}