{"id":2328,"date":"2024-11-10T11:02:40","date_gmt":"2024-11-10T03:02:40","guid":{"rendered":"https:\/\/fwq.ai\/blog\/2328\/"},"modified":"2024-11-10T11:02:40","modified_gmt":"2024-11-10T03:02:40","slug":"javascript-%e4%b8%ad%e7%9a%84-this-%e6%8c%87%e5%90%91%ef%bc%9a%e5%87%bd%e6%95%b0%e8%b0%83%e7%94%a8%e6%97%b6%e5%ae%83%e7%a9%b6%e7%ab%9f%e6%8c%87%e5%90%91%e4%bb%80%e4%b9%88%ef%bc%9f","status":"publish","type":"post","link":"https:\/\/fwq.ai\/blog\/2328\/","title":{"rendered":"JavaScript \u4e2d\u7684 `this` \u6307\u5411\uff1a\u51fd\u6570\u8c03\u7528\u65f6\u5b83\u7a76\u7adf\u6307\u5411\u4ec0\u4e48\uff1f"},"content":{"rendered":"<p><img decoding=\"async\" src=\"https:\/\/img.php.cn\/upload\/article\/001\/246\/273\/173071535385794.jpg\" class=\"aligncenter\" title=\"JavaScript \u4e2d\u7684 `this` \u6307\u5411\uff1a\u51fd\u6570\u8c03\u7528\u65f6\u5b83\u7a76\u7adf\u6307\u5411\u4ec0\u4e48\uff1f\u63d2\u56fe\" alt=\"JavaScript \u4e2d\u7684 `this` \u6307\u5411\uff1a\u51fd\u6570\u8c03\u7528\u65f6\u5b83\u7a76\u7adf\u6307\u5411\u4ec0\u4e48\uff1f\u63d2\u56fe\" \/><\/p>\n<p><strong>this\u5728js\u51fd\u6570\u4e2d\u7684\u4f5c\u7528<\/strong><\/p>\n<p>\u5728javascript\u4e2d\uff0cthis\u5173\u952e\u5b57\u6307\u5411\u51fd\u6570\u6267\u884c\u65f6\u7684\u5f53\u524d\u4e0a\u4e0b\u6587\u5bf9\u8c61\u3002\u5b83\u5728\u4e0d\u540c\u7684\u60c5\u51b5\u4e0b\u53ef\u80fd\u6307\u5411\u4e0d\u540c\u7684\u5bf9\u8c61\uff0c\u4f8b\u5982\uff1a<\/p>\n<ul>\n<li>\u4f5c\u4e3a\u65b9\u6cd5\uff1a\u6307\u5411\u8c03\u7528\u5b83\u7684\u5bf9\u8c61\u3002<\/li>\n<li>\u4f5c\u4e3a\u72ec\u7acb\u51fd\u6570\uff1a\u6307\u5411\u5168\u5c40\u5bf9\u8c61\uff08\u5728\u6d4f\u89c8\u5668\u4e2d\u901a\u5e38\u4e3awindow\u5bf9\u8c61\uff09\u3002<\/li>\n<\/ul>\n<p>\u5bf9\u4e8e\u7ed9\u5b9a\u7684\u793a\u4f8b\u51fd\u6570\uff1a<\/p>\n<pre>function f() {\n  alert($(this).attr('id'));\n}<\/pre>\n<p> \u767b\u5f55\u540e\u590d\u5236 <\/p>\n<p>this\u6307\u5411\u503c\u53d6\u51b3\u4e8e\u51fd\u6570\u7684\u8c03\u7528\u65b9\u5f0f\u3002\u5982\u679c\u76f4\u63a5\u8c03\u7528\uff08f()\uff09\uff0cthis\u5c06\u6307\u5411\u5168\u5c40\u5bf9\u8c61\uff0c\u800c\u4e0d\u662f\u70b9\u51fb\u5143\u7d20\u3002<\/p>\n<p><span>\u7acb\u5373\u5b66\u4e60<\/span>\u201c\u201d\uff1b<\/p>\n<p><strong>\u63a7\u5236this\u6307\u5411<\/strong><\/p>\n<p>\u4e3a\u4e86\u63a7\u5236this\u6307\u5411\uff0c\u53ef\u4ee5\u901a\u8fc7\u4ee5\u4e0b\u4e24\u79cd\u65b9\u5f0f\uff1a<\/p>\n<p><strong>1. \u663e\u5f0f\u4f20\u9012\u4e8b\u4ef6\u6e90<\/strong><\/p>\n<p>\u5728\u8c03\u7528\u51fd\u6570\u65f6\uff0c\u53ef\u4ee5\u663e\u5f0f\u5730\u5c06\u4e8b\u4ef6\u6e90\u4f5c\u4e3a\u53c2\u6570\u4f20\u9012\u7ed9\u51fd\u6570\u3002\u8fd9\u786e\u4fddthis\u59cb\u7ec8\u6307\u5411\u9884\u671f\u7684\u5143\u7d20\u3002<\/p>\n<pre>f(this);<\/pre>\n<p> \u767b\u5f55\u540e\u590d\u5236 <\/p>\n<p><strong>2. \u4f7f\u7528\u4e8b\u4ef6\u7ed1\u5b9a<\/strong><\/p>\n<p>\u901a\u8fc7\u4e8b\u4ef6\u7ed1\u5b9a\uff0c\u53ef\u4ee5\u5728\u4e8b\u4ef6\u89e6\u53d1\u65f6\u8bbe\u7f6ethis\u6307\u5411\u7684\u503c\u3002\u4f8b\u5982\uff0c\u4f7f\u7528jquery\u7ed1\u5b9a\uff1a<\/p>\n<pre>$('.xx').on('click', function() {\n  $(this).attr('id');\n});<\/pre>\n<p> \u767b\u5f55\u540e\u590d\u5236 <\/p>\n<p>\u8fd9\u6837\uff0cthis\u5c06\u59cb\u7ec8\u6307\u5411\u88ab\u70b9\u51fb\u7684\u5143\u7d20\u3002<\/p>\n<p>\u4ee5\u4e0a\u5c31\u662fJavaScript \u4e2d\u7684 `this` \u6307\u5411\uff1a\u51fd\u6570\u8c03\u7528\u65f6\u5b83\u7a76\u7adf\u6307\u5411\u4ec0\u4e48\uff1f\u7684\u8be6\u7ec6\u5185\u5bb9\uff0c\u66f4\u591a\u8bf7\u5173\u6ce8\u7c73\u4e91\u5176\u5b83\u76f8\u5173\u6587\u7ae0\uff01<\/p>\n","protected":false},"excerpt":{"rendered":"<p>this\u5728js\u51fd\u6570\u4e2d\u7684\u4f5c\u7528 \u5728javascript\u4e2d\uff0cthis\u5173\u952e\u5b57\u6307\u5411\u51fd\u6570\u6267\u884c\u65f6\u7684\u5f53\u524d\u4e0a\u4e0b\u6587\u5bf9\u8c61\u3002\u5b83\u5728\u4e0d\u540c\u7684\u60c5\u51b5\u4e0b\u53ef\u80fd\u6307\u5411\u4e0d\u540c\u7684\u5bf9\u8c61\uff0c\u4f8b\u5982\uff1a \u4f5c\u4e3a\u65b9\u6cd5\uff1a\u6307\u5411\u8c03\u7528\u5b83\u7684\u5bf9\u8c61\u3002 \u4f5c\u4e3a\u72ec\u7acb\u51fd\u6570\uff1a\u6307\u5411\u5168\u5c40\u5bf9\u8c61\uff08\u5728\u6d4f\u89c8\u5668\u4e2d\u901a\u5e38\u4e3awindow\u5bf9\u8c61\uff09\u3002 \u5bf9\u4e8e\u7ed9\u5b9a\u7684\u793a\u4f8b\u51fd\u6570\uff1a function f() { alert($(this).attr(&#8216;id&#8217;)); } \u767b\u5f55\u540e\u590d\u5236 this\u6307\u5411\u503c\u53d6\u51b3\u4e8e\u51fd\u6570\u7684\u8c03\u7528\u65b9\u5f0f\u3002\u5982\u679c\u76f4\u63a5\u8c03\u7528\uff08f()\uff09\uff0cthis\u5c06\u6307\u5411\u5168\u5c40\u5bf9\u8c61\uff0c\u800c\u4e0d\u662f\u70b9\u51fb\u5143\u7d20\u3002 \u7acb\u5373\u5b66\u4e60\u201c\u201d\uff1b \u63a7\u5236this\u6307\u5411 \u4e3a\u4e86\u63a7\u5236this\u6307\u5411\uff0c\u53ef\u4ee5\u901a\u8fc7\u4ee5\u4e0b\u4e24\u79cd\u65b9\u5f0f\uff1a 1. \u663e\u5f0f\u4f20\u9012\u4e8b\u4ef6\u6e90 \u5728\u8c03\u7528\u51fd\u6570\u65f6\uff0c\u53ef\u4ee5\u663e\u5f0f\u5730\u5c06\u4e8b\u4ef6\u6e90\u4f5c\u4e3a\u53c2\u6570\u4f20\u9012\u7ed9\u51fd\u6570\u3002\u8fd9\u786e\u4fddthis\u59cb\u7ec8\u6307\u5411\u9884\u671f\u7684\u5143\u7d20\u3002 f(this); \u767b\u5f55\u540e\u590d\u5236 2. \u4f7f\u7528\u4e8b\u4ef6\u7ed1\u5b9a \u901a\u8fc7\u4e8b\u4ef6\u7ed1\u5b9a\uff0c\u53ef\u4ee5\u5728\u4e8b\u4ef6\u89e6\u53d1\u65f6\u8bbe\u7f6ethis\u6307\u5411\u7684\u503c\u3002\u4f8b\u5982\uff0c\u4f7f\u7528jquery\u7ed1\u5b9a\uff1a $(&#8216;.xx&#8217;).on(&#8216;click&#8217;, function() { $(this).attr(&#8216;id&#8217;); }); \u767b\u5f55\u540e\u590d\u5236 \u8fd9\u6837\uff0cthis\u5c06\u59cb\u7ec8\u6307\u5411\u88ab\u70b9\u51fb\u7684\u5143\u7d20\u3002 \u4ee5\u4e0a\u5c31\u662fJavaScript \u4e2d\u7684 `this` \u6307\u5411\uff1a\u51fd\u6570\u8c03\u7528\u65f6\u5b83\u7a76\u7adf\u6307\u5411\u4ec0\u4e48\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},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[16],"tags":[],"class_list":["post-2328","post","type-post","status-publish","format-standard","hentry","category-16"],"_links":{"self":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/2328","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=2328"}],"version-history":[{"count":0,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/2328\/revisions"}],"wp:attachment":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/media?parent=2328"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/categories?post=2328"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/tags?post=2328"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}