{"id":186823,"date":"2023-08-20T19:17:59","date_gmt":"2023-08-20T11:17:59","guid":{"rendered":"http:\/\/www.idc.net\/help\/186823\/"},"modified":"2023-08-20T19:17:59","modified_gmt":"2023-08-20T11:17:59","slug":"%e5%90%8e%e6%b5%aa%e4%ba%91%e7%99%be%e5%ba%a6%e5%b0%8f%e7%a8%8b%e5%ba%8f%e6%95%99%e7%a8%8b%ef%bc%9a%e5%be%aa%e7%8e%af","status":"publish","type":"post","link":"https:\/\/idc.net\/help\/186823\/","title":{"rendered":"\u540e\u6d6a\u4e91\u767e\u5ea6\u5c0f\u7a0b\u5e8f\u6559\u7a0b\uff1a\u5faa\u73af"},"content":{"rendered":"<ul>\n<li>\u5faa\u73af\n<ul>\n<li>s-for\n<ul>\n<li>\u9ed8\u8ba4\u60c5\u51b5<\/li>\n<li>\u7b80\u5199<\/li>\n<\/ul>\n<\/li>\n<li>trackBy\n<ul><\/ul>\n<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<h1><span><\/span>\u5faa\u73af<\/h1>\n<h2><span><\/span>s-for<\/h2>\n<p>\u901a\u8fc7\u5faa\u73af\u6e32\u67d3\u5217\u8868\u662f\u5e38\u89c1\u7684\u573a\u666f\uff0c\u5728\u5143\u7d20\u4e0a\u4f5c\u7528 s-for \u6307\u4ee4\uff0c\u6211\u4eec\u53ef\u4ee5\u6e32\u67d3\u4e00\u4e2a\u5217\u8868\u3002<\/p>\n<h3><span><\/span>\u9ed8\u8ba4\u60c5\u51b5<\/h3>\n<p>\u9ed8\u8ba4\u4e0d\u5199\u60c5\u51b5\u4e0b\uff0c\u4e0b\u6807\u7d22\u5f15\u662f\u4e3a index\uff0c\u6570\u7ec4\u5f53\u524d\u53d8\u91cf\u540d\u9ed8\u8ba4\u4e3a item\u3002<\/p>\n<p><strong>\u4ee3\u7801\u793a\u4f8b<\/strong><\/p>\n<ul>\n<li>SWAN<\/li>\n<li>JS<\/li>\n<\/ul>\n<pre>\n \n \n <ol>\n  \n  \n  <li><code><span>&lt;!-- for-demo.swan--&gt;<\/span><\/code><\/li>\n  \n  \n  <li><code><span>&lt;view&gt;<\/span><\/code><\/li>\n  \n  \n  <li><code><span> <\/span><span>&lt;view<\/span><span> <\/span><span>s-for<\/span><span>=<\/span><span>\"persons\"<\/span><span>&gt;<\/span><\/code><\/li>\n  \n  \n  <li><code><span> {{index}}: {{item.name}}<\/span><\/code><\/li>\n  \n  \n  <li><code><span> <\/span><span>&lt;\/view&gt;<\/span><\/code><\/li>\n  \n  \n  <li><code><span>&lt;\/view&gt;<\/span><\/code><\/li>\n \n \n <\/ol><\/pre>\n<pre>\n \n \n <ol>\n  \n  \n  <li><code><span>\/\/ for-demo.js<\/span><\/code><\/li>\n  \n  \n  <li><code><span>Page<\/span><span>({<\/span><\/code><\/li>\n  \n  \n  <li><code><span> data<\/span><span>:<\/span><span> <\/span><span>{<\/span><\/code><\/li>\n  \n  \n  <li><code><span> persons<\/span><span>:<\/span><span> <\/span><span>[<\/span><\/code><\/li>\n  \n  \n  <li><code><span> <\/span><span>{<\/span><span>name<\/span><span>:<\/span><span> <\/span><span>'Curry'<\/span><span>},<\/span><\/code><\/li>\n  \n  \n  <li><code><span> <\/span><span>{<\/span><span>name<\/span><span>:<\/span><span> <\/span><span>'Thompson'<\/span><span>},<\/span><\/code><\/li>\n  \n  \n  <li><code><span> <\/span><span>{<\/span><span>name<\/span><span>:<\/span><span> <\/span><span>'Durant'<\/span><span>},<\/span><\/code><\/li>\n  \n  \n  <li><code><span> <\/span><span>{<\/span><span>name<\/span><span>:<\/span><span> <\/span><span>'Green'<\/span><span>},<\/span><\/code><\/li>\n  \n  \n  <li><code><span> <\/span><span>{<\/span><span>name<\/span><span>:<\/span><span> <\/span><span>'Cousins'<\/span><span>}<\/span><\/code><\/li>\n  \n  \n  <li><code><span> <\/span><span>]<\/span><\/code><\/li>\n  \n  \n  <li><code><span> <\/span><span>}<\/span><\/code><\/li>\n  \n  \n  <li><code><span>});<\/span><\/code><\/li>\n \n \n <\/ol><\/pre>\n<h3><span><\/span>\u7b80\u5199<\/h3>\n<p>\u901a\u8fc7\u7b80\u5199\u7684\u65b9\u5f0f\uff0c\u6307\u5b9a\u4e0b\u6807\u7d22\u5f15\u548c\u6570\u7ec4\u5f53\u524d\u53d8\u91cf\u540d\u3002<\/p>\n<p><strong>\u4ee3\u7801\u793a\u4f8b<\/strong><\/p>\n<ul>\n<li>SWAN<\/li>\n<\/ul>\n<pre>\n \n \n <ol>\n  \n  \n  <li><code><span>&lt;!-- for-demo.swan--&gt;<\/span><\/code><\/li>\n  \n  \n  <li><code><span>&lt;view&gt;<\/span><\/code><\/li>\n  \n  \n  <li><code><span> <\/span><span>&lt;view<\/span><span> <\/span><span>s-for<\/span><span>=<\/span><span>\"p,index in persons\"<\/span><span>&gt;<\/span><\/code><\/li>\n  \n  \n  <li><code><span> {{index}}: {{p.name}}<\/span><\/code><\/li>\n  \n  \n  <li><code><span> <\/span><span>&lt;\/view&gt;<\/span><\/code><\/li>\n  \n  \n  <li><code><span>&lt;\/view&gt;<\/span><\/code><\/li>\n \n \n <\/ol><\/pre>\n<p>\u4e5f\u53ef\u4ee5\u901a\u8fc7\u4f7f\u7528 s-for-index \u6765\u6307\u5b9a\u4e0b\u6807\u7d22\u5f15\uff0cs-for-item \u6765\u6307\u5b9a\u6570\u7ec4\u5f53\u524d\u53d8\u91cf\u540d\u3002<\/p>\n<ul>\n<li>SWAN<\/li>\n<\/ul>\n<pre>\n \n \n <ol>\n  \n  \n  <li><code><span>&lt;!-- for-demo.swan--&gt;<\/span><\/code><\/li>\n  \n  \n  <li><code><span>&lt;view&gt;<\/span><\/code><\/li>\n  \n  \n  <li><code><span> <\/span><span>&lt;view<\/span><span> <\/span><span>s-for<\/span><span>=<\/span><span>\"persons\"<\/span><span> <\/span><span>s-for-index<\/span><span>=<\/span><span>\"idx\"<\/span><span> <\/span><span>s-for-item<\/span><span>=<\/span><span>\"p\"<\/span><span>&gt;<\/span><\/code><\/li>\n  \n  \n  <li><code><span> {{idx}}: {{p.name}}<\/span><\/code><\/li>\n  \n  \n  <li><code><span> <\/span><span>&lt;\/view&gt;<\/span><\/code><\/li>\n  \n  \n  <li><code><span>&lt;\/view&gt;<\/span><\/code><\/li>\n \n \n <\/ol><\/pre>\n<h2><span><\/span>trackBy<\/h2>\n<p>\u5982\u679c\u5217\u8868\u4e2d\u7684\u9879\u76ee\u4f1a\u52a8\u6001\u5730\u589e\u52a0\u3001\u5220\u9664\uff0c\u5e76\u4e14\u5e0c\u671b\u5217\u8868\u4e2d\u7684\u9879\u76ee\u4fdd\u6301\u81ea\u5df1\u7684\u7279\u5f81\u548c\u72b6\u6001\uff08\u4f8b\u5982 input \u4e2d\u7684\u8f93\u5165\u5185\u5bb9\uff09\uff0c\u9700\u8981\u5728 s-for \u6307\u4ee4\u58f0\u660e\u4e2d\u6307\u5b9a trackBy\u3002<\/p>\n<p>trackBy \u540e\u8ddf\u7684\u503c\u53ef\u4ee5\u662f s-for \u7684 array \u4e2d item \u672c\u8eab\u6216\u8005\u5176\u5c5e\u6027\uff08\u5982 item.id\uff09\uff0c\u8be5\u503c\u9700\u8981\u662f\u5217\u8868\u4e2d\u552f\u4e00\u7684\u5b57\u7b26\u4e32\u6216\u6570\u5b57\uff0c\u4e14\u4e0d\u80fd\u52a8\u6001\u6539\u53d8\u3002<\/p>\n<p>\u5f53\u6570\u636e\u66f4\u65b0\u89e6\u53d1\u91cd\u65b0\u6e32\u67d3\u65f6\uff0c\u5c06\u81ea\u52a8\u8ddf\u8e2a\u9879\u7684\u53d8\u66f4\uff0c\u539f\u5148\u5217\u8868\u5185\u7684\u9879\u4f4d\u7f6e\u4f1a\u79fb\u52a8\uff0c\u65b0\u6dfb\u52a0\u7684\u9879\u4f1a\u88ab\u6e32\u67d3\uff0c\u4ee5\u786e\u4fdd\u7ec4\u4ef6\u4fdd\u6301\u81ea\u8eab\u7684\u72b6\u6001\uff0c\u5e76\u4e14\u7701\u53bb\u4e00\u90e8\u5206\u91cd\u65b0\u6e32\u67d3\u5e26\u6765\u7684\u6d88\u8017\u3002<\/p>\n<p><strong>\u4ee3\u7801\u793a\u4f8b<\/strong><\/p>\n<p>\u5728\u5f00\u53d1\u8005\u5de5\u5177\u4e2d\u6253\u5f00<\/p>\n<p>\u5728\u5f00\u53d1\u8005\u5de5\u5177\u4e2d\u6253\u5f00<\/p>\n<p>\u5728 WEB IDE \u4e2d\u6253\u5f00<\/p>\n<ul>\n<li>SWAN<\/li>\n<li>JS<\/li>\n<\/ul>\n<pre>\n \n \n <ol>\n  \n  \n  <li><code><span>&lt;input<\/span><span> <\/span><span>s-for<\/span><span>=<\/span><span>\"list trackBy item\"<\/span><span> <\/span><span>placeholder<\/span><span>=<\/span><span>\"\u8bf7\u8f93\u5165\u5185\u5bb9\"<\/span><span> <\/span><span>\/&gt;<\/span><\/code><\/li>\n  \n  \n  <li><code><span>&lt;button<\/span><span> <\/span><span>bindtap<\/span><span>=<\/span><span>\"delete\"<\/span><span>&gt;<\/span><span>\u5220\u9664\u9996\u9879<\/span><span>&lt;\/button&gt;<\/span><\/code><\/li>\n \n \n <\/ol><\/pre>\n<pre>\n \n \n <ol>\n  \n  \n  <li><code><span>Page<\/span><span>({<\/span><\/code><\/li>\n  \n  \n  <li><code><span> data<\/span><span>:<\/span><span> <\/span><span>{<\/span><\/code><\/li>\n  \n  \n  <li><code><span> list<\/span><span>:<\/span><span> <\/span><span>[<\/span><span>1<\/span><span>,<\/span><span> <\/span><span>2<\/span><span>,<\/span><span> <\/span><span>3<\/span><span>,<\/span><span> <\/span><span>4<\/span><span>]<\/span><\/code><\/li>\n  \n  \n  <li><code><span> <\/span><span>},<\/span><\/code><\/li>\n  \n  \n  <li><code><span> <\/span><span>delete<\/span><span>()<\/span><span> <\/span><span>{<\/span><\/code><\/li>\n  \n  \n  <li><code><span> <\/span><span>const<\/span><span> list <\/span><span>=<\/span><span> <\/span><span>this<\/span><span>.<\/span><span>data<\/span><span>.<\/span><span>list<\/span><\/code><\/li>\n  \n  \n  <li><code><span> console<\/span><span>.<\/span><span>log<\/span><span>(<\/span><span>'\u5f53\u524d\u5220\u9664\u9879\u76ee id'<\/span><span>,<\/span><span> list<\/span><span>.<\/span><span>splice<\/span><span>(<\/span><span>0<\/span><span>,<\/span><span> <\/span><span>1<\/span><span>)[<\/span><span>0<\/span><span>])<\/span><\/code><\/li>\n  \n  \n  <li><code><span> <\/span><span>this<\/span><span>.<\/span><span>setData<\/span><span>({<\/span><span>list<\/span><span>})<\/span><\/code><\/li>\n  \n  \n  <li><code><span> <\/span><span>}<\/span><\/code><\/li>\n  \n  \n  <li><code><span>})<\/span><\/code><\/li>\n \n \n <\/ol><\/pre>\n<p><strong>Tips<\/strong>\uff1a<\/p>\n<p>\u5f53\u5faa\u73af\u6e32\u67d3\u81ea\u5b9a\u4e49\u7ec4\u4ef6\u5217\u8868\u65f6\uff0c\u4e0d\u6307\u5b9a trackBy \u800c\u52a8\u6001\u589e\u5220\u6570\u7ec4\u4e2d\u7684\u5143\u7d20\uff0c\u53ef\u80fd\u4f1a\u5bfc\u81f4\u8c03\u7528\u9519\u8bef\u7684 attached detached \u751f\u547d\u5468\u671f\u51fd\u6570\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u5faa\u73af s-for \u9ed8\u8ba4\u60c5\u51b5 \u7b80\u5199 trackBy \u5faa\u73af s-for \u901a\u8fc7\u5faa\u73af\u6e32\u67d3\u5217\u8868\u662f\u5e38\u89c1\u7684\u573a\u666f\uff0c\u5728\u5143\u7d20\u4e0a\u4f5c\u7528 [&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-186823","post","type-post","status-publish","format-standard","hentry","category-mini-program"],"_links":{"self":[{"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/posts\/186823","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=186823"}],"version-history":[{"count":0,"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/posts\/186823\/revisions"}],"wp:attachment":[{"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/media?parent=186823"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/categories?post=186823"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/tags?post=186823"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}