{"id":3457,"date":"2024-11-10T11:21:09","date_gmt":"2024-11-10T03:21:09","guid":{"rendered":"https:\/\/fwq.ai\/blog\/3457\/"},"modified":"2024-11-10T11:21:09","modified_gmt":"2024-11-10T03:21:09","slug":"%e5%a6%82%e4%bd%95%e8%ae%be%e7%bd%aejs%e8%bf%94%e5%9b%9e","status":"publish","type":"post","link":"https:\/\/fwq.ai\/blog\/3457\/","title":{"rendered":"\u5982\u4f55\u8bbe\u7f6ejs\u8fd4\u56de"},"content":{"rendered":"<blockquote><p>\n  javascript \u8fd4\u56de\u673a\u5236\u6709\u4ee5\u4e0b\u51e0\u79cd\u65b9\u5f0f\uff1areturn \u5173\u952e\u5b57\uff1a\u7528\u4e8e\u4ece\u51fd\u6570\u8fd4\u56de\u4e00\u4e2a\u503c\u6216\u4e2d\u65ad\u5faa\u73af\/\u6761\u4ef6\u8bed\u53e5\u3002throw \u8bed\u53e5\uff1a\u629b\u51fa\u4e00\u4e2a\u9519\u8bef\uff0c\u7ed3\u675f\u51fd\u6570\u6216\u4ee3\u7801\u5757\u7684\u6267\u884c\u3002break \u548c continue \u8bed\u53e5\uff1a\u7ed3\u675f\u6216\u7ee7\u7eed\u5faa\u73af\u3002callback \u51fd\u6570\uff1a\u4f20\u7ed9\u5176\u4ed6\u51fd\u6570\u7684\u51fd\u6570\uff0c\u7528\u4e8e\u5728\u8c03\u7528\u51fd\u6570\u6267\u884c\u5b8c\u6210\u540e\u6267\u884c\u64cd\u4f5c\u3002\n<\/p><\/blockquote>\n<p><img decoding=\"async\" src=\"https:\/\/img.php.cn\/upload\/article\/202411\/08\/2024110812432239449.jpg\" class=\"aligncenter\" title=\"\u5982\u4f55\u8bbe\u7f6ejs\u8fd4\u56de\u63d2\u56fe\" alt=\"\u5982\u4f55\u8bbe\u7f6ejs\u8fd4\u56de\u63d2\u56fe\" \/><\/p>\n<p><strong>\u5982\u4f55\u8bbe\u7f6e JavaScript \u8fd4\u56de<\/strong><\/p>\n<p>JavaScript \u4e2d\u6709\u51e0\u4e2a\u51fd\u6570\u53ef\u7528\uff0c\u53ef\u4ee5\u5c06\u7a0b\u5e8f\u63a7\u5236\u6743\u8fd4\u56de\u5230\u8c03\u7528\u51fd\u6570\u6216\u4ee3\u7801\u5757\u3002<\/p>\n<p><strong>1. return \u5173\u952e\u5b57<\/strong><\/p>\n<p>\u6700\u5e38\u89c1\u7684\u65b9\u6cd5\u662f\u4f7f\u7528 <strong>return<\/strong> \u5173\u952e\u5b57\u3002\u5b83\u53ef\u4ee5\u7528\u6765\uff1a<\/p>\n<ul>\n<li>\n<p>\u4ece\u51fd\u6570\u8fd4\u56de\u4e00\u4e2a\u503c\uff0c\u4ece\u800c\u7ed3\u675f\u51fd\u6570\u7684\u6267\u884c\u3002<\/p>\n<pre>function sum(a, b) {\nreturn a + b;\n}\n\nconsole.log(sum(2, 5)); \/\/ \u8f93\u51fa: 7<\/pre>\n<p>  \u767b\u5f55\u540e\u590d\u5236  <\/li>\n<li>\n<p>\u4e2d\u65ad\u5faa\u73af\u6216\u6761\u4ef6\u8bed\u53e5\u3002<\/p>\n<pre>for (let i = 0; i &lt; 5; i++) {\nif (i === 2) {\n  return; \/\/ \u4e2d\u65ad\u5faa\u73af\n}\n}<\/pre>\n<p>  \u767b\u5f55\u540e\u590d\u5236  <\/li>\n<\/ul>\n<p><strong>2. throw \u8bed\u53e5<\/strong><\/p>\n<p><strong>throw<\/strong> \u8bed\u53e5\u7528\u4e8e\u629b\u51fa\u4e00\u4e2a\u9519\u8bef\uff0c\u4ece\u800c\u7ed3\u675f\u51fd\u6570\u6216\u4ee3\u7801\u5757\u7684\u6267\u884c\u3002\u5b83\u53ef\u4ee5\u7528\u6765\u5904\u7406\u5f02\u5e38\u6216\u9519\u8bef\u60c5\u51b5\u3002<\/p>\n<pre>try {\n  \/\/ \u53ef\u80fd\u629b\u51fa\u9519\u8bef\u7684\u4ee3\u7801\n  throw new Error(\"\u9519\u8bef\u6d88\u606f\");\n} catch (error) {\n  \/\/ \u5904\u7406\u9519\u8bef\n}<\/pre>\n<p>  \u767b\u5f55\u540e\u590d\u5236   <\/p>\n<p><strong>3. break \u548c continue \u8bed\u53e5<\/strong><\/p>\n<p><strong>break<\/strong> \u548c <strong>continue<\/strong> \u8bed\u53e5\u53ef\u7528\u4e8e\u7ed3\u675f\u6216\u7ee7\u7eed\u5faa\u73af\u3002<\/p>\n<ul>\n<li>\n<p><strong>break:<\/strong> \u8df3\u51fa\u6574\u4e2a\u5faa\u73af\u3002<\/p>\n<pre>for (let i = 0; i &lt; 5; i++) {\nif (i === 2) {\n  break; \/\/ \u8df3\u51fa\u5faa\u73af\n}\n}<\/pre>\n<p>  \u767b\u5f55\u540e\u590d\u5236  <\/li>\n<li>\n<p><strong>continue:<\/strong> \u8df3\u8fc7\u5f53\u524d\u5faa\u73af\u7684\u5176\u4f59\u90e8\u5206\uff0c\u5e76\u7ee7\u7eed\u6267\u884c\u4e0b\u4e00\u4e2a\u5faa\u73af\u3002<\/p>\n<pre>for (let i = 0; i &lt; 5; i++) {\nif (i === 2) {\n  continue; \/\/ \u8df3\u8fc7\u5f53\u524d\u5faa\u73af\n}\n\n\/\/ \u6267\u884c\u4ee3\u7801\n}<\/pre>\n<p>  \u767b\u5f55\u540e\u590d\u5236  <\/li>\n<\/ul>\n<p><strong>4. callback \u51fd\u6570<\/strong><\/p>\n<p>\u4f20\u7ed9\u5176\u4ed6\u51fd\u6570\u7684\u51fd\u6570\u79f0\u4e3a callback \u51fd\u6570\u3002\u5b83\u4eec\u53ef\u4ee5\u7528\u4e8e\u5728\u8c03\u7528\u51fd\u6570\u6267\u884c\u5b8c\u6210\u540e\u6267\u884c\u64cd\u4f5c\u3002<\/p>\n<pre>function asyncTask(callback) {\n  \/\/ \u5f02\u6b65\u64cd\u4f5c\n  callback(); \/\/ \u8c03\u7528\u56de\u8c03\u51fd\u6570\n}\n\nasyncTask(function() {\n  \/\/ \u5f02\u6b65\u64cd\u4f5c\u5b8c\u6210\u540e\u6267\u884c\u7684\u4ee3\u7801\n});<\/pre>\n<p>  \u767b\u5f55\u540e\u590d\u5236   <\/p>\n<p>\u4ee5\u4e0a\u662f\u8bbe\u7f6e JavaScript \u8fd4\u56de\u7684\u51e0\u79cd\u65b9\u6cd5\u3002\u6839\u636e\u60a8\u7684\u7279\u5b9a\u9700\u6c42\u548c\u4ee3\u7801\u7ed3\u6784\uff0c\u9009\u62e9\u6700\u9002\u5408\u7684\u65b9\u6cd5\u3002<\/p>\n<p>\u4ee5\u4e0a\u5c31\u662f\u5982\u4f55\u8bbe\u7f6ejs\u8fd4\u56de\u7684\u8be6\u7ec6\u5185\u5bb9\uff0c\u66f4\u591a\u8bf7\u5173\u6ce8\u7c73\u4e91\u5176\u5b83\u76f8\u5173\u6587\u7ae0\uff01<\/p>\n","protected":false},"excerpt":{"rendered":"<p>javascript \u8fd4\u56de\u673a\u5236\u6709\u4ee5\u4e0b\u51e0\u79cd\u65b9\u5f0f\uff1areturn \u5173\u952e\u5b57\uff1a\u7528\u4e8e\u4ece\u51fd\u6570\u8fd4\u56de\u4e00\u4e2a\u503c\u6216\u4e2d\u65ad\u5faa\u73af\/\u6761\u4ef6\u8bed\u53e5\u3002throw \u8bed\u53e5\uff1a\u629b\u51fa\u4e00\u4e2a\u9519\u8bef\uff0c\u7ed3\u675f\u51fd\u6570\u6216\u4ee3\u7801\u5757\u7684\u6267\u884c\u3002break \u548c continue \u8bed\u53e5\uff1a\u7ed3\u675f\u6216\u7ee7\u7eed\u5faa\u73af\u3002callback \u51fd\u6570\uff1a\u4f20\u7ed9\u5176\u4ed6\u51fd\u6570\u7684\u51fd\u6570\uff0c\u7528\u4e8e\u5728\u8c03\u7528\u51fd\u6570\u6267\u884c\u5b8c\u6210\u540e\u6267\u884c\u64cd\u4f5c\u3002 \u5982\u4f55\u8bbe\u7f6e JavaScript \u8fd4\u56de JavaScript \u4e2d\u6709\u51e0\u4e2a\u51fd\u6570\u53ef\u7528\uff0c\u53ef\u4ee5\u5c06\u7a0b\u5e8f\u63a7\u5236\u6743\u8fd4\u56de\u5230\u8c03\u7528\u51fd\u6570\u6216\u4ee3\u7801\u5757\u3002 1. return \u5173\u952e\u5b57 \u6700\u5e38\u89c1\u7684\u65b9\u6cd5\u662f\u4f7f\u7528 return \u5173\u952e\u5b57\u3002\u5b83\u53ef\u4ee5\u7528\u6765\uff1a \u4ece\u51fd\u6570\u8fd4\u56de\u4e00\u4e2a\u503c\uff0c\u4ece\u800c\u7ed3\u675f\u51fd\u6570\u7684\u6267\u884c\u3002 function sum(a, b) { return a + b; } console.log(sum(2, 5)); \/\/ \u8f93\u51fa: 7 \u767b\u5f55\u540e\u590d\u5236 \u4e2d\u65ad\u5faa\u73af\u6216\u6761\u4ef6\u8bed\u53e5\u3002 for (let i = 0; i &lt; 5; i++) { if (i === 2) { return; \/\/ \u4e2d\u65ad\u5faa\u73af } [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[16],"tags":[],"class_list":["post-3457","post","type-post","status-publish","format-standard","hentry","category-16"],"_links":{"self":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/3457","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/comments?post=3457"}],"version-history":[{"count":0,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/3457\/revisions"}],"wp:attachment":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/media?parent=3457"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/categories?post=3457"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/tags?post=3457"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}