{"id":1704,"date":"2024-11-10T10:46:44","date_gmt":"2024-11-10T02:46:44","guid":{"rendered":"https:\/\/fwq.ai\/blog\/1704\/"},"modified":"2024-11-10T10:46:44","modified_gmt":"2024-11-10T02:46:44","slug":"%e5%a6%82%e4%bd%95%e9%ab%98%e6%95%88%e9%81%8d%e5%8e%86-javascript-%e6%95%b0%e7%bb%84%ef%bc%9f","status":"publish","type":"post","link":"https:\/\/fwq.ai\/blog\/1704\/","title":{"rendered":"\u5982\u4f55\u9ad8\u6548\u904d\u5386 JavaScript \u6570\u7ec4\uff1f"},"content":{"rendered":"<p><img decoding=\"async\" src=\"https:\/\/img.php.cn\/upload\/article\/001\/246\/273\/173053945438437.jpg\" class=\"aligncenter\" title=\"\u5982\u4f55\u9ad8\u6548\u904d\u5386 JavaScript \u6570\u7ec4\uff1f\u63d2\u56fe\" alt=\"\u5982\u4f55\u9ad8\u6548\u904d\u5386 JavaScript \u6570\u7ec4\uff1f\u63d2\u56fe\" \/><\/p>\n<p><strong>javascript \u4e2d\u6570\u7ec4\u904d\u5386\u8be6\u89e3<\/strong><\/p>\n<p>javascript \u63d0\u4f9b\u4e86\u591a\u79cd\u65b9\u6cd5\u6765\u904d\u5386\u6570\u7ec4\u3002\u6700\u5e38\u89c1\u7684\u65b9\u6cd5\u4e4b\u4e00\u662f\u901a\u8fc7\u4f20\u7edf\u7684 for \u5faa\u73af\uff1a<\/p>\n<pre>var List = ['one', 'two', 'three'];\n\nfor (var i = 0; i &lt; List.length; i++) {\n  alert(List[i]);\n}<\/pre>\n<p> \u767b\u5f55\u540e\u590d\u5236 <\/p>\n<p>\u5728\u8fd9\u4e2a\u4ee3\u7801\u7247\u6bb5\u4e2d\uff0c\u6211\u4eec\u58f0\u660e\u4e86\u4e00\u4e2a\u540d\u4e3a list \u7684\u6570\u7ec4\uff0c\u5176\u4e2d\u5305\u542b\u4e09\u4e2a\u5143\u7d20\u3002for \u5faa\u73af\u4f7f\u7528\u53d8\u91cf i \u4f5c\u4e3a\u6570\u7ec4\u7d22\u5f15\uff0c\u4ece 0 \u5f00\u59cb\uff0c\u76f4\u5230\u8fbe\u5230 list.length\uff08\u6570\u7ec4\u4e2d\u5143\u7d20\u7684\u6570\u91cf\uff09\u3002\u5728\u6bcf\u6b21\u5faa\u73af\u8fed\u4ee3\u4e2d\uff0c\u5faa\u73af\u90fd\u8bbf\u95ee\u6570\u7ec4\u7684\u5f53\u524d\u5143\u7d20\u5e76\u5bf9\u5176\u6267\u884c\u64cd\u4f5c\uff08\u5728\u672c\u4f8b\u4e2d\u662f\u4f7f\u7528 alert() \u663e\u793a\u5143\u7d20\uff09\u3002<\/p>\n<p>\u9700\u8981\u6ce8\u610f\u7684\u662f\uff0c\u6570\u7ec4\u7d22\u5f15\u4ece 0 \u5f00\u59cb\uff0c\u56e0\u6b64\u7b2c\u4e00\u4e2a\u5143\u7d20\u7684\u7d22\u5f15\u662f 0\uff0c\u6700\u540e\u4e00\u4e2a\u5143\u7d20\u7684\u7d22\u5f15\u662f list.length &#8211; 1\u3002<\/p>\n<p><span>\u7acb\u5373\u5b66\u4e60<\/span>\u201c\u201d\uff1b<\/p>\n<p>\u9664\u4e86 for \u5faa\u73af\u5916\uff0c\u8fd8\u6709\u8bb8\u591a\u5176\u4ed6\u7528\u4e8e\u904d\u5386\u6570\u7ec4\u7684\u65b9\u6cd5\uff0c\u5305\u62ec\uff1a<\/p>\n<ul>\n<li>foreach() \u65b9\u6cd5\uff1a\u4e00\u79cd\u66f4\u7b80\u6d01\u7684\u66ff\u4ee3 for \u5faa\u73af\u7684\u51fd\u6570\uff0c\u7528\u4e8e\u6267\u884c\u64cd\u4f5c\u800c\u4e0d\u9700\u8981\u624b\u52a8\u7ba1\u7406\u5faa\u73af\u7d22\u5f15\u3002<\/li>\n<li>map() \u65b9\u6cd5\uff1a\u521b\u5efa\u65b0\u6570\u7ec4\uff0c\u5176\u4e2d\u5305\u542b\u901a\u8fc7\u6307\u5b9a\u51fd\u6570\u8f6c\u6362\u7684\u6bcf\u4e2a\u5143\u7d20\u7684\u7ed3\u679c\u3002<\/li>\n<li>filter() \u65b9\u6cd5\uff1a\u521b\u5efa\u65b0\u6570\u7ec4\uff0c\u5176\u4e2d\u5305\u542b\u901a\u8fc7\u6307\u5b9a\u51fd\u6570\u6d4b\u8bd5\u4e3a\u771f\uff08\u901a\u8fc7\uff09\u7684\u6bcf\u4e2a\u5143\u7d20\u3002<\/li>\n<\/ul>\n<p>\u9009\u62e9\u54ea\u79cd\u65b9\u6cd5\u53d6\u51b3\u4e8e\u624b\u5934\u7684\u7279\u5b9a\u4efb\u52a1\u3002\u4f46\u662f\uff0c\u4f20\u7edf\u7684 for \u5faa\u73af\u4ecd\u7136\u662f\u6700\u7075\u6d3b\u548c\u6700\u53ef\u63a7\u7684\u6570\u7ec4\u904d\u5386\u65b9\u6cd5\u4e4b\u4e00\u3002<\/p>\n<p>\u4ee5\u4e0a\u5c31\u662f\u5982\u4f55\u9ad8\u6548\u904d\u5386 JavaScript \u6570\u7ec4\uff1f\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 \u4e2d\u6570\u7ec4\u904d\u5386\u8be6\u89e3 javascript \u63d0\u4f9b\u4e86\u591a\u79cd\u65b9\u6cd5\u6765\u904d\u5386\u6570\u7ec4\u3002\u6700\u5e38\u89c1\u7684\u65b9\u6cd5\u4e4b\u4e00\u662f\u901a\u8fc7\u4f20\u7edf\u7684 for \u5faa\u73af\uff1a var List = [&#8216;one&#8217;, &#8216;two&#8217;, &#8216;three&#8217;]; for (var i = 0; i &lt; List.length; i++) { alert(List[i]); } \u767b\u5f55\u540e\u590d\u5236 \u5728\u8fd9\u4e2a\u4ee3\u7801\u7247\u6bb5\u4e2d\uff0c\u6211\u4eec\u58f0\u660e\u4e86\u4e00\u4e2a\u540d\u4e3a list \u7684\u6570\u7ec4\uff0c\u5176\u4e2d\u5305\u542b\u4e09\u4e2a\u5143\u7d20\u3002for \u5faa\u73af\u4f7f\u7528\u53d8\u91cf i \u4f5c\u4e3a\u6570\u7ec4\u7d22\u5f15\uff0c\u4ece 0 \u5f00\u59cb\uff0c\u76f4\u5230\u8fbe\u5230 list.length\uff08\u6570\u7ec4\u4e2d\u5143\u7d20\u7684\u6570\u91cf\uff09\u3002\u5728\u6bcf\u6b21\u5faa\u73af\u8fed\u4ee3\u4e2d\uff0c\u5faa\u73af\u90fd\u8bbf\u95ee\u6570\u7ec4\u7684\u5f53\u524d\u5143\u7d20\u5e76\u5bf9\u5176\u6267\u884c\u64cd\u4f5c\uff08\u5728\u672c\u4f8b\u4e2d\u662f\u4f7f\u7528 alert() \u663e\u793a\u5143\u7d20\uff09\u3002 \u9700\u8981\u6ce8\u610f\u7684\u662f\uff0c\u6570\u7ec4\u7d22\u5f15\u4ece 0 \u5f00\u59cb\uff0c\u56e0\u6b64\u7b2c\u4e00\u4e2a\u5143\u7d20\u7684\u7d22\u5f15\u662f 0\uff0c\u6700\u540e\u4e00\u4e2a\u5143\u7d20\u7684\u7d22\u5f15\u662f list.length &#8211; 1\u3002 \u7acb\u5373\u5b66\u4e60\u201c\u201d\uff1b \u9664\u4e86 for \u5faa\u73af\u5916\uff0c\u8fd8\u6709\u8bb8\u591a\u5176\u4ed6\u7528\u4e8e\u904d\u5386\u6570\u7ec4\u7684\u65b9\u6cd5\uff0c\u5305\u62ec\uff1a foreach() \u65b9\u6cd5\uff1a\u4e00\u79cd\u66f4\u7b80\u6d01\u7684\u66ff\u4ee3 for \u5faa\u73af\u7684\u51fd\u6570\uff0c\u7528\u4e8e\u6267\u884c\u64cd\u4f5c\u800c\u4e0d\u9700\u8981\u624b\u52a8\u7ba1\u7406\u5faa\u73af\u7d22\u5f15\u3002 map() \u65b9\u6cd5\uff1a\u521b\u5efa\u65b0\u6570\u7ec4\uff0c\u5176\u4e2d\u5305\u542b\u901a\u8fc7\u6307\u5b9a\u51fd\u6570\u8f6c\u6362\u7684\u6bcf\u4e2a\u5143\u7d20\u7684\u7ed3\u679c\u3002 filter() \u65b9\u6cd5\uff1a\u521b\u5efa\u65b0\u6570\u7ec4\uff0c\u5176\u4e2d\u5305\u542b\u901a\u8fc7\u6307\u5b9a\u51fd\u6570\u6d4b\u8bd5\u4e3a\u771f\uff08\u901a\u8fc7\uff09\u7684\u6bcf\u4e2a\u5143\u7d20\u3002 [&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-1704","post","type-post","status-publish","format-standard","hentry","category-16"],"_links":{"self":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/1704","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=1704"}],"version-history":[{"count":0,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/1704\/revisions"}],"wp:attachment":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/media?parent=1704"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/categories?post=1704"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/tags?post=1704"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}