{"id":2001,"date":"2025-02-25T22:12:25","date_gmt":"2025-02-25T14:12:25","guid":{"rendered":"https:\/\/www.laixuexila.com\/?p=2001"},"modified":"2025-02-25T22:12:25","modified_gmt":"2025-02-25T14:12:25","slug":"javascript-%e7%94%a8%e6%b3%95","status":"publish","type":"post","link":"https:\/\/www.laixuexila.com\/index.php\/2025\/02\/25\/javascript-%e7%94%a8%e6%b3%95\/","title":{"rendered":"JavaScript\u00a0\u7528\u6cd5"},"content":{"rendered":"\n<p>JavaScript \u7684\u7528\u6cd5\u975e\u5e38\u5e7f\u6cdb\uff0c\u4ee5\u4e0b\u662f\u4e00\u4e9b\u57fa\u7840\u7684\u5e38\u89c1\u7528\u6cd5\uff0c\u5305\u62ec\u53d8\u91cf\u58f0\u660e\u3001\u8fd0\u7b97\u7b26\u3001\u6761\u4ef6\u8bed\u53e5\u3001\u5faa\u73af\u548c\u51fd\u6570\u3002\u901a\u8fc7\u8fd9\u4e9b\u5185\u5bb9\uff0c\u4f60\u5c06\u80fd\u591f\u7f16\u5199\u7b80\u5355\u7684\u811a\u672c\u6765\u5b9e\u73b0\u7f51\u9875\u7684\u4ea4\u4e92\u529f\u80fd\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">1. <strong>\u53d8\u91cf\u58f0\u660e<\/strong><\/h3>\n\n\n\n<p>JavaScript \u4e2d\u6709\u4e09\u79cd\u58f0\u660e\u53d8\u91cf\u7684\u65b9\u5f0f\uff1a<code>var<\/code>\u3001<code>let<\/code> \u548c <code>const<\/code>\u3002<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><code>var<\/code>\uff1a\u7528\u4e8e\u58f0\u660e\u53d8\u91cf\uff0c\u4f46\u5b83\u7684\u4f5c\u7528\u57df\u8f83\u5927\uff0c\u53ef\u80fd\u4f1a\u5bfc\u81f4\u4e00\u4e9b\u6f5c\u5728\u95ee\u9898\uff0c\u4e0d\u63a8\u8350\u7528\u4e8e\u73b0\u4ee3 JavaScript\u3002<\/li>\n\n\n\n<li><code>let<\/code>\uff1a\u7528\u4e8e\u58f0\u660e\u5757\u7ea7\u4f5c\u7528\u57df\u7684\u53d8\u91cf\uff0c\u63a8\u8350\u4f7f\u7528\u3002<\/li>\n\n\n\n<li><code>const<\/code>\uff1a\u7528\u4e8e\u58f0\u660e\u5e38\u91cf\uff0c\u58f0\u660e\u540e\u65e0\u6cd5\u91cd\u65b0\u8d4b\u503c\u3002<\/li>\n<\/ul>\n\n\n\n<pre class=\"wp-block-code\"><code>let age = 25;\nconst name = \"Alice\";<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\">2. <strong>\u6570\u636e\u7c7b\u578b<\/strong><\/h3>\n\n\n\n<p>JavaScript \u4e2d\u5e38\u89c1\u7684\u57fa\u672c\u6570\u636e\u7c7b\u578b\u5305\u62ec\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Number<\/strong>\uff1a\u6570\u5b57\u7c7b\u578b<\/li>\n\n\n\n<li><strong>String<\/strong>\uff1a\u5b57\u7b26\u4e32\u7c7b\u578b<\/li>\n\n\n\n<li><strong>Boolean<\/strong>\uff1a\u5e03\u5c14\u503c\uff08<code>true<\/code> \u6216 <code>false<\/code>\uff09<\/li>\n\n\n\n<li><strong>Null<\/strong>\uff1a\u8868\u793a\u65e0\u503c<\/li>\n\n\n\n<li><strong>Undefined<\/strong>\uff1a\u8868\u793a\u672a\u5b9a\u4e49\u7684\u503c<\/li>\n\n\n\n<li><strong>Object<\/strong>\uff1a\u590d\u6742\u6570\u636e\u7c7b\u578b<\/li>\n<\/ul>\n\n\n\n<pre class=\"wp-block-code\"><code>let number = 100;        \/\/ Number\nlet message = \"Hello!\";  \/\/ String\nlet isActive = true;     \/\/ Boolean\nlet user = null;         \/\/ Null\nlet unknown;             \/\/ Undefined<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\">3. <strong>\u8fd0\u7b97\u7b26<\/strong><\/h3>\n\n\n\n<p>JavaScript \u652f\u6301\u5e38\u89c1\u7684\u6570\u5b66\u8fd0\u7b97\u7b26\u3001\u8d4b\u503c\u8fd0\u7b97\u7b26\u3001\u6bd4\u8f83\u8fd0\u7b97\u7b26\u7b49\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>let a = 5, b = 3;\n\n\/\/ \u7b97\u672f\u8fd0\u7b97\u7b26\nconsole.log(a + b); \/\/ 8\nconsole.log(a - b); \/\/ 2\nconsole.log(a * b); \/\/ 15\nconsole.log(a \/ b); \/\/ 1.666...\n\n\/\/ \u6bd4\u8f83\u8fd0\u7b97\u7b26\nconsole.log(a &gt; b);  \/\/ true\nconsole.log(a === b); \/\/ false<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\">4. <strong>\u6761\u4ef6\u8bed\u53e5<\/strong><\/h3>\n\n\n\n<p>\u4f7f\u7528 <code>if<\/code>\u3001<code>else if<\/code> \u548c <code>else<\/code> \u6765\u63a7\u5236\u4ee3\u7801\u7684\u6267\u884c\u6d41\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>let temperature = 30;\n\nif (temperature &gt; 25) {\n    console.log(\"It's hot outside!\");\n} else {\n    console.log(\"It's nice and cool outside!\");\n}<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\">5. <strong>\u5faa\u73af<\/strong><\/h3>\n\n\n\n<p>JavaScript \u63d0\u4f9b\u4e86 <code>for<\/code> \u548c <code>while<\/code> \u7b49\u5faa\u73af\u7ed3\u6784\uff0c\u7528\u4e8e\u91cd\u590d\u6267\u884c\u4ee3\u7801\u5757\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>\/\/ for \u5faa\u73af\nfor (let i = 0; i &lt; 5; i++) {\n    console.log(i);  \/\/ \u8f93\u51fa 0, 1, 2, 3, 4\n}\n\n\/\/ while \u5faa\u73af\nlet j = 0;\nwhile (j &lt; 5) {\n    console.log(j);  \/\/ \u8f93\u51fa 0, 1, 2, 3, 4\n    j++;\n}<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\">6. <strong>\u51fd\u6570<\/strong><\/h3>\n\n\n\n<p>\u51fd\u6570\u662f JavaScript \u4e2d\u7684\u57fa\u672c\u6784\u5efa\u5757\uff0c\u53ef\u4ee5\u5c06\u4e00\u6bb5\u4ee3\u7801\u5c01\u88c5\u6210\u53ef\u91cd\u7528\u7684\u5757\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>\/\/ \u5b9a\u4e49\u51fd\u6570\nfunction greet(name) {\n    return \"Hello, \" + name + \"!\";\n}\n\n\/\/ \u8c03\u7528\u51fd\u6570\nlet greetingMessage = greet(\"Alice\");\nconsole.log(greetingMessage);  \/\/ \u8f93\u51fa \"Hello, Alice!\"<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\">7. <strong>\u4e8b\u4ef6\u5904\u7406<\/strong><\/h3>\n\n\n\n<p>JavaScript \u7ecf\u5e38\u4e0e\u7528\u6237\u7684\u64cd\u4f5c\uff08\u5982\u70b9\u51fb\u3001\u8f93\u5165\u7b49\uff09\u4e92\u52a8\uff0c\u53ef\u4ee5\u901a\u8fc7\u4e8b\u4ef6\u6765\u89e6\u53d1\u7279\u5b9a\u7684\u529f\u80fd\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>&lt;!DOCTYPE html&gt;\n&lt;html lang=\"en\"&gt;\n&lt;head&gt;\n    &lt;meta charset=\"UTF-8\"&gt;\n    &lt;meta name=\"viewport\" content=\"width=device-width, initial-scale=1.0\"&gt;\n    &lt;title&gt;JavaScript \u4e8b\u4ef6\u793a\u4f8b&lt;\/title&gt;\n&lt;\/head&gt;\n&lt;body&gt;\n    &lt;button id=\"myButton\"&gt;\u70b9\u51fb\u6211&lt;\/button&gt;\n\n    &lt;script&gt;\n        \/\/ \u83b7\u53d6\u6309\u94ae\u5143\u7d20\n        let button = document.getElementById(\"myButton\");\n\n        \/\/ \u6dfb\u52a0\u70b9\u51fb\u4e8b\u4ef6\u76d1\u542c\u5668\n        button.addEventListener(\"click\", function() {\n            alert(\"\u6309\u94ae\u88ab\u70b9\u51fb\u4e86\uff01\");\n        });\n    &lt;\/script&gt;\n&lt;\/body&gt;\n&lt;\/html&gt;<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\">8. <strong>\u6570\u7ec4<\/strong><\/h3>\n\n\n\n<p>\u6570\u7ec4\u662f\u7528\u4e8e\u5b58\u50a8\u591a\u4e2a\u503c\u7684\u5bf9\u8c61\uff0c\u5e38\u7528\u4e8e\u5b58\u50a8\u4e00\u7ec4\u6570\u636e\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>let fruits = &#91;\"Apple\", \"Banana\", \"Cherry\"];\nconsole.log(fruits&#91;0]);  \/\/ \u8f93\u51fa \"Apple\"\n\n\/\/ \u6570\u7ec4\u7684\u5e38\u89c1\u65b9\u6cd5\nfruits.push(\"Orange\");  \/\/ \u6dfb\u52a0\u5143\u7d20\u5230\u6570\u7ec4\u672b\u5c3e\nconsole.log(fruits);     \/\/ \u8f93\u51fa &#91;\"Apple\", \"Banana\", \"Cherry\", \"Orange\"]<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\">\u5c0f\u7ed3<\/h3>\n\n\n\n<p>\u8fd9\u4e9b\u662f JavaScript \u7684\u4e00\u4e9b\u57fa\u7840\u7528\u6cd5\uff0c\u638c\u63e1\u8fd9\u4e9b\u57fa\u672c\u6982\u5ff5\u540e\uff0c\u4f60\u5c31\u53ef\u4ee5\u5f00\u59cb\u7f16\u5199\u66f4\u590d\u6742\u7684\u4ee3\u7801\u4e86\u3002\u901a\u8fc7\u5b9e\u8df5\u8fd9\u4e9b\u8bed\u6cd5\uff0c\u9010\u6b65\u7406\u89e3 JavaScript \u662f\u5982\u4f55\u5b9e\u73b0\u52a8\u6001\u548c\u4ea4\u4e92\u5f0f\u7f51\u9875\u529f\u80fd\u7684\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>JavaScript \u7684\u7528\u6cd5\u975e\u5e38\u5e7f\u6cdb\uff0c\u4ee5\u4e0b\u662f\u4e00\u4e9b\u57fa\u7840\u7684\u5e38\u89c1\u7528\u6cd5\uff0c\u5305\u62ec\u53d8\u91cf\u58f0\u660e\u3001\u8fd0\u7b97\u7b26\u3001\u6761\u4ef6\u8bed\u53e5\u3001\u5faa\u73af\u548c\u51fd\u6570\u3002\u901a [&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-2001","post","type-post","status-publish","format-standard","hentry","category-javascript"],"_links":{"self":[{"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/posts\/2001","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=2001"}],"version-history":[{"count":1,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/posts\/2001\/revisions"}],"predecessor-version":[{"id":2002,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/posts\/2001\/revisions\/2002"}],"wp:attachment":[{"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/media?parent=2001"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/categories?post=2001"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/tags?post=2001"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}