{"id":185332,"date":"2023-08-20T16:44:08","date_gmt":"2023-08-20T08:44:08","guid":{"rendered":"http:\/\/www.idc.net\/help\/185332\/"},"modified":"2023-08-20T16:44:08","modified_gmt":"2023-08-20T08:44:08","slug":"%e5%90%8e%e6%b5%aa%e4%ba%91%e5%b0%8f%e7%a8%8b%e5%ba%8f%e6%95%99%e7%a8%8b%ef%bc%9a%e5%be%ae%e4%bf%a1%e5%b0%8f%e7%a8%8b%e5%ba%8f-%e8%af%ad%e5%8f%a5","status":"publish","type":"post","link":"https:\/\/idc.net\/help\/185332\/","title":{"rendered":"\u540e\u6d6a\u4e91\u5c0f\u7a0b\u5e8f\u6559\u7a0b\uff1a\u5fae\u4fe1\u5c0f\u7a0b\u5e8f \u8bed\u53e5"},"content":{"rendered":"<h2>if \u8bed\u53e5<\/h2>\n<p>\u5728 WXS \u4e2d\uff0c\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u683c\u5f0f\u7684&nbsp;if&nbsp;\u8bed\u53e5 \uff1a<\/p>\n<ul>\n<li>if (expression) statement&nbsp;\uff1a \u5f53&nbsp;expression&nbsp;\u4e3a truthy \u65f6\uff0c\u6267\u884c&nbsp;statement\u3002<\/li>\n<li>if (expression) statement1 else statement2&nbsp;: \u5f53&nbsp;expression&nbsp;\u4e3a truthy \u65f6\uff0c\u6267\u884c&nbsp;statement1\u3002 \u5426\u5219\uff0c\u6267\u884c&nbsp;statement2<\/li>\n<li>if ... else if ... else statementN&nbsp;\u901a\u8fc7\u8be5\u53e5\u578b\uff0c\u53ef\u4ee5\u5728&nbsp;statement1&nbsp;~&nbsp;statementN&nbsp;\u4e4b\u95f4\u9009\u5176\u4e2d\u4e00\u4e2a\u6267\u884c\u3002<\/li>\n<\/ul>\n<p>\u793a\u4f8b\u8bed\u6cd5\uff1a<\/p>\n<pre><code>\/\/ if ...\n\nif (\u8868\u8fbe\u5f0f) \u8bed\u53e5;\n\nif (\u8868\u8fbe\u5f0f) \n  \u8bed\u53e5;\n\nif (\u8868\u8fbe\u5f0f) {\n  \u4ee3\u7801\u5757;\n}\n\n\n\/\/ if ... else \n\nif (\u8868\u8fbe\u5f0f) \u8bed\u53e5;\nelse \u8bed\u53e5;\n\nif (\u8868\u8fbe\u5f0f) \n  \u8bed\u53e5;\nelse \n  \u8bed\u53e5;\n\nif (\u8868\u8fbe\u5f0f) {\n  \u4ee3\u7801\u5757;\n} else {\n  \u4ee3\u7801\u5757;\n}\n\n\/\/ if ... else if ... else ...\n\nif (\u8868\u8fbe\u5f0f) {\n  \u4ee3\u7801\u5757;\n} else if (\u8868\u8fbe\u5f0f) {\n  \u4ee3\u7801\u5757;\n} else if (\u8868\u8fbe\u5f0f) {\n  \u4ee3\u7801\u5757;\n} else {\n  \u4ee3\u7801\u5757;\n}\n<\/code><\/pre>\n<h2>switch \u8bed\u53e5<\/h2>\n<p>\u793a\u4f8b\u8bed\u6cd5\uff1a<\/p>\n<pre><code>switch (\u8868\u8fbe\u5f0f) {\n  case \u53d8\u91cf:\n    \u8bed\u53e5;\n  case \u6570\u5b57:\n    \u8bed\u53e5;\n    break;\n  case \u5b57\u7b26\u4e32:\n    \u8bed\u53e5;\n  default:\n    \u8bed\u53e5;\n}\n<\/code><\/pre>\n<ul>\n<li>default&nbsp;\u5206\u652f\u53ef\u4ee5\u7701\u7565\u4e0d\u5199\u3002<\/li>\n<li>case&nbsp;\u5173\u952e\u8bcd\u540e\u9762\u53ea\u80fd\u4f7f\u7528\uff1a\u53d8\u91cf\uff0c\u6570\u5b57\uff0c\u5b57\u7b26\u4e32\u3002<\/li>\n<\/ul>\n<p>\u793a\u4f8b\u4ee3\u7801\uff1a<\/p>\n<pre><code>var exp = 10;\n\nswitch ( exp ) {\ncase \"10\":\n  console.log(\"string 10\");\n  break;\ncase 10:\n  console.log(\"number 10\");\n  break;\ncase exp:\n  console.log(\"var exp\");\n  break;\ndefault:\n  console.log(\"default\");\n}\n<\/code><\/pre>\n<p>\u8f93\u51fa\uff1a<\/p>\n<pre><code>number 10\n<\/code><\/pre>\n<h2>for \u8bed\u53e5<\/h2>\n<p>\u793a\u4f8b\u8bed\u6cd5\uff1a<\/p>\n<pre><code>for (\u8bed\u53e5; \u8bed\u53e5; \u8bed\u53e5)\n  \u8bed\u53e5;\n\nfor (\u8bed\u53e5; \u8bed\u53e5; \u8bed\u53e5) {\n  \u4ee3\u7801\u5757;\n}\n<\/code><\/pre>\n<ul>\n<li>\u652f\u6301\u4f7f\u7528&nbsp;break\uff0ccontinue&nbsp;\u5173\u952e\u8bcd\u3002<\/li>\n<\/ul>\n<p>\u793a\u4f8b\u4ee3\u7801\uff1a<\/p>\n<pre><code>for (var i = 0; i &lt; 3; ++i) {\n  console.log(i);\n  if( i &gt;= 1) break;\n}\n<\/code><\/pre>\n<p>\u8f93\u51fa\uff1a<\/p>\n<pre><code>0\n1\n<\/code><\/pre>\n<h2>while \u8bed\u53e5<\/h2>\n<p>\u793a\u4f8b\u8bed\u6cd5\uff1a<\/p>\n<pre><code>while (\u8868\u8fbe\u5f0f)\n  \u8bed\u53e5;\n\nwhile (\u8868\u8fbe\u5f0f){\n  \u4ee3\u7801\u5757;\n}\n\ndo {\n  \u4ee3\u7801\u5757;\n} while (\u8868\u8fbe\u5f0f)\n<\/code><\/pre>\n<ul>\n<li>\u5f53\u8868\u8fbe\u5f0f\u4e3a true \u65f6\uff0c\u5faa\u73af\u6267\u884c\u8bed\u53e5\u6216\u4ee3\u7801\u5757\u3002<\/li>\n<li>\u652f\u6301\u4f7f\u7528&nbsp;break\uff0ccontinue&nbsp;\u5173\u952e\u8bcd\u3002<\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>if \u8bed\u53e5 \u5728 WXS \u4e2d\uff0c\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u683c\u5f0f\u7684&nbsp;if&nbsp;\u8bed\u53e5 \uff1a if (expressio [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[182398],"tags":[],"class_list":["post-185332","post","type-post","status-publish","format-standard","hentry","category-mini-program"],"_links":{"self":[{"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/posts\/185332","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/comments?post=185332"}],"version-history":[{"count":0,"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/posts\/185332\/revisions"}],"wp:attachment":[{"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/media?parent=185332"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/categories?post=185332"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/tags?post=185332"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}