{"id":262,"date":"2023-05-04T14:03:57","date_gmt":"2023-05-04T06:03:57","guid":{"rendered":"https:\/\/yichenghui.net\/?p=262"},"modified":"2023-05-04T14:03:57","modified_gmt":"2023-05-04T06:03:57","slug":"array-prototype-tostring","status":"publish","type":"post","link":"https:\/\/yichenghui.net\/index.php\/2023\/05\/04\/array-prototype-tostring\/","title":{"rendered":"Array.prototype.toString"},"content":{"rendered":"<h1>Array.prototype.toString()<\/h1>\n<p><strong><code>toString()<\/code><\/strong> \u65b9\u6cd5\u8fd4\u56de\u4e00\u4e2a\u5b57\u7b26\u4e32\uff0c\u8868\u793a\u6307\u5b9a\u7684\u6570\u7ec4\u53ca\u5176\u5143\u7d20\u3002<\/p>\n<h2>\u8bed\u6cd5<\/h2>\n<pre><code class=\"language-js-nolint\">toString()<\/code><\/pre>\n<h3>\u8fd4\u56de\u503c<\/h3>\n<p>\u4e00\u4e2a\u8868\u793a\u6570\u7ec4\u5143\u7d20\u7684\u5b57\u7b26\u4e32\u3002<\/p>\n<h2>\u63cf\u8ff0<\/h2>\n<p><strong>Array<\/strong> \u5bf9\u8c61\u8986\u76d6\u4e86 <strong>Object<\/strong> \u7684 <code>toString<\/code> \u65b9\u6cd5\u3002\u6570\u7ec4\u7684 <code>toString<\/code> \u65b9\u6cd5\u5b9e\u9645\u4e0a\u5728\u5185\u90e8\u8c03\u7528\u4e86 <code>join()<\/code> \u65b9\u6cd5\u6765\u62fc\u63a5\u6570\u7ec4\u5e76\u8fd4\u56de\u4e00\u4e2a\u5305\u542b\u6240\u6709\u6570\u7ec4\u5143\u7d20\u7684\u5b57\u7b26\u4e32\uff0c\u5143\u7d20\u4e4b\u95f4\u7528\u9017\u53f7\u5206\u9694\u3002\u5982\u679c <code>join<\/code> \u65b9\u6cd5\u4e0d\u53ef\u7528\u6216\u8005\u4e0d\u662f\u51fd\u6570\uff0c\u5219\u4f1a\u4f7f\u7528 <a href=\"\/zh-CN\/docs\/Web\/JavaScript\/Reference\/Global_Objects\/Object\/toString\"><code>Object.prototype.toString<\/code><\/a> \u6765\u4ee3\u66ff, \u5e76\u8fd4\u56de <code>[object Array]<\/code>\u3002<\/p>\n<pre><code class=\"language-js\">const arr = [];\narr.join = 1; \/\/ \u5c06 `join` \u91cd\u65b0\u8d4b\u503c\u4e3a\u975e\u51fd\u6570\u7684\u503c\nconsole.log(arr.toString()); \/\/ [object Array]\n\nconsole.log(Array.prototype.toString.call({ join: () =&gt; 1 })); \/\/ 1<\/code><\/pre>\n<p>\u5f53\u6570\u7ec4\u9700\u8981\u88ab\u8868\u793a\u4e3a\u6587\u672c\u503c\uff0c\u6216\u8005\u5f53\u6570\u7ec4\u5728\u5b57\u7b26\u4e32\u62fc\u63a5\u4e2d\u88ab\u5f15\u7528\u65f6\uff0cJavaScript \u4f1a\u81ea\u52a8\u8c03\u7528 <code>toString()<\/code> \u65b9\u6cd5\u3002<\/p>\n<h2>\u793a\u4f8b<\/h2>\n<h3>\u4f7f\u7528 toString()<\/h3>\n<pre><code class=\"language-js\">const array1 = [1, 2, &quot;a&quot;, &quot;1a&quot;];\n\nconsole.log(array1.toString()); \/\/ &quot;1,2,a,1a&quot;<\/code><\/pre>\n<h3>\u5728\u7a00\u758f\u6570\u7ec4\u4e2d\u4f7f\u7528 toString()<\/h3>\n<p>\u4e0e <code>join()<\/code> \u7684\u884c\u4e3a\u4e00\u81f4\uff0c<code>toString()<\/code> \u5c06\u7a7a\u69fd\u89c6\u4e3a <code>undefined<\/code> \u5e76\u751f\u6210\u4e00\u4e2a\u989d\u5916\u7684\u5206\u9694\u7b26\uff1a<\/p>\n<pre><code class=\"language-js\">console.log([1, , 3].toString()); \/\/ &#039;1,,3&#039;<\/code><\/pre>\n<h3>\u5728\u975e\u6570\u7ec4\u5bf9\u8c61\u4e2d\u4f7f\u7528 toString()<\/h3>\n<p><code>toString()<\/code> \u662f<a href=\"\/zh-CN\/docs\/Web\/JavaScript\/Reference\/Global_Objects\/Array#\u901a\u7528\u6570\u7ec4\u65b9\u6cd5\">\u901a\u7528\u7684<\/a>\u3002\u5b83\u671f\u671b <code>this<\/code> \u5177\u6709 <code>join()<\/code> \u65b9\u6cd5\uff1b\u5982\u679c\u4e0d\u5b58\u5728\uff0c\u5219\u4f7f\u7528 <code>Object.prototype.toString()<\/code>\u3002<\/p>\n<pre><code class=\"language-js\">console.log(Array.prototype.toString.call({ join: () =&gt; 1 }));\n\/\/ 1; \u4e00\u4e2a\u6570\u5b57\nconsole.log(Array.prototype.toString.call({ join: () =&gt; undefined }));\n\/\/ undefined\nconsole.log(Array.prototype.toString.call({ join: &quot;not function&quot; }));\n\/\/ &quot;[object Object]&quot;<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"<p>Array.prototype.toString() toString() \u65b9\u6cd5\u8fd4\u56de\u4e00\u4e2a\u5b57\u7b26\u4e32\uff0c\u8868\u793a\u6307\u5b9a\u7684\u6570\u7ec4 &hellip; <\/p>\n<p class=\"link-more\"><a href=\"https:\/\/yichenghui.net\/index.php\/2023\/05\/04\/array-prototype-tostring\/\" class=\"more-link\">\u7ee7\u7eed\u9605\u8bfb<span class=\"screen-reader-text\">\u201cArray.prototype.toString\u201d<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_kadence_starter_templates_imported_post":false,"footnotes":""},"categories":[4],"tags":[],"class_list":["post-262","post","type-post","status-publish","format-standard","hentry","category-javascript"],"_links":{"self":[{"href":"https:\/\/yichenghui.net\/index.php\/wp-json\/wp\/v2\/posts\/262","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/yichenghui.net\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/yichenghui.net\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/yichenghui.net\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/yichenghui.net\/index.php\/wp-json\/wp\/v2\/comments?post=262"}],"version-history":[{"count":0,"href":"https:\/\/yichenghui.net\/index.php\/wp-json\/wp\/v2\/posts\/262\/revisions"}],"wp:attachment":[{"href":"https:\/\/yichenghui.net\/index.php\/wp-json\/wp\/v2\/media?parent=262"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/yichenghui.net\/index.php\/wp-json\/wp\/v2\/categories?post=262"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/yichenghui.net\/index.php\/wp-json\/wp\/v2\/tags?post=262"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}