{"id":3313,"date":"2021-01-13T15:41:52","date_gmt":"2021-01-13T07:41:52","guid":{"rendered":"http:\/\/www.salesforcecrm.cn\/?p=3313"},"modified":"2021-01-13T15:41:52","modified_gmt":"2021-01-13T07:41:52","slug":"%e5%9c%a8%e9%97%aa%e7%94%b5web%e7%bb%84%e4%bb%b6%e4%b9%8b%e9%97%b4%e9%80%9a%e4%bf%a1-%e7%88%b6%e6%af%8d%e4%b8%8e%e5%ad%a9%e5%ad%90%e6%b2%9f%e9%80%9a","status":"publish","type":"post","link":"http:\/\/www.ponybai.com\/?p=3313","title":{"rendered":"\u5728\u95ea\u7535Web\u7ec4\u4ef6\u4e4b\u95f4\u901a\u4fe1 &#8211; \u7236\u6bcd\u4e0e\u5b69\u5b50\u6c9f\u901a"},"content":{"rendered":"<h1 class=\"slds-p-top_small slds-text-heading_large\"><span>\u7236\u6bcd\u4e0e\u5b69\u5b50\u6c9f\u901a<\/span><\/h1>\n<div class=\"unit-content\">\n<p><span>\u4e3a\u4e86\u542f\u7528\u4ece\u7236\u7ec4\u4ef6\u5230\u5b50\u7ec4\u4ef6\u7684\u901a\u4fe1\uff0c\u5b50\u7ec4\u4ef6\u516c\u5f00\u4e00\u4e2a\u5c5e\u6027\u6216\u51fd\u6570\u4ee5\u4f7f\u5176\u516c\u5f00\u3002\u7136\u540e\uff0c\u7236\u6bcd\u53ef\u4ee5\u66f4\u65b0\u5b69\u5b50\u7684\u516c\u5171\u8d22\u4ea7\u6216\u8c03\u7528\u5b69\u5b50\u7684\u516c\u5171\u804c\u80fd\u3002<\/span><\/p>\n<p><img decoding=\"async\" class=\"image\" src=\"https:\/\/res.cloudinary.com\/hy4kyit2a\/f_auto,fl_lossy,q_70\/learn\/projects\/communicate-between-lightning-web-components\/communicate-from-parent-to-child\/images\/7b3b25bc68ca11cb55faa2ebd5154c96_adb-876-fc-1214-4396-ae-32-6-f-14-d-70-bdf-76.png\" alt=\"\u7236\u6bcd\u4e0e\u5b69\u5b50\u4e4b\u95f4\u7684\u901a\u4fe1\u56fe\uff0c\u663e\u793a\u4e86\u589e\u5e45\u5668\u81f3\u5206\u5b50\u3002\" width=\"330\" \/><\/p>\n<p><span>\u6b64\u5916\uff0c\u5982\u679c\u8981\u6dfb\u52a0\u4e00\u4e9b\u529f\u80fd\uff0c\u8bf7\u5728\u5b50\u7ec4\u4ef6\u4e0a\u5c06public\u5c5e\u6027\u66f4\u65b0\u4e3agetter\u548csetter\u3002<\/span><\/p>\n<p><span>\u8ba9\u6211\u4eec\u4ece\u7b80\u5355\u7684\u516c\u5171\u5c5e\u6027\u66f4\u65b0\u5f00\u59cb\u3002\u53e6\u4e00\u4e2a\u4e1a\u52a1\u90e8\u95e8\u627e\u5230\u4e86\u60a8\u6784\u5efa\u7684\u5206\u5b50\u3002\u4ed6\u4eec\u60f3\u4f7f\u7528\u5b83\u5e76\u6dfb\u52a0\u5230\u5b83\u3002\u4ed6\u4eec\u7684\u7b2c\u4e00\u4e2a\u8981\u6c42\u662f\u80fd\u591f\u8bbe\u7f6e\u8ba1\u6570\u5668\u7684\u8d77\u59cb\u7f16\u53f7\u3002\u6211\u4eec\u4e0d\u60f3\u8fdb\u884c\u4efb\u4f55\u4f1a\u5f71\u54cd\u539f\u59cb\u4e1a\u52a1\u7528\u4f8b\u7684\u66f4\u6539\uff0c\u56e0\u6b64\u8ba9\u6211\u4eec\u5c06\u5206\u5b50\u7ec4\u4ef6\u5305\u88c5\u5728\u53e6\u4e00\u4e2a\u7ec4\u4ef6\u4e2d\uff0c\u8be5\u7ec4\u4ef6\u5c06\u62e5\u6709\u65b0\u529f\u80fd\u3002\u00a0<\/span><\/p>\n<h2 id=\"update-a-public-property\"><span>\u66f4\u65b0\u516c\u5171\u8d22\u4ea7<\/span><\/h2>\n<p><code>@api<\/code><span>\u5b50\u7ec4\u4ef6\u4e2d\u7684\u88c5\u9970\u5668\u516c\u5f00\u4e00\u4e2a\u5c5e\u6027\uff0c\u4f7f\u5176\u516c\u5f00\uff0c\u4ee5\u4fbf\u7236\u7ec4\u4ef6\u53ef\u4ee5\u5bf9\u5176\u8fdb\u884c\u66f4\u65b0\u3002<\/span><\/p>\n<ol>\n<li><span>\u5728\u5b50\u7ec4\u4ef6\uff08\u5206\u5b50\uff09\u4e2d\u516c\u5f00\u4e00\u4e2a\u516c\u5171\u5c5e\u6027\uff1a<\/span>\n<ol>\n<li><span>\u5728Visual Studio Code\u4e2d\uff0c\u6253\u5f00<\/span><strong><span>numerator.js<\/span><\/strong><span>\u5e76\u5c06<\/span><code>@api<\/code><span>\u00a0\u88c5\u9970\u5668\u5e94\u7528\u4e8e<\/span><code>counter<\/code><span>\u5c5e\u6027\uff1a<\/span>\n<div class=\"code-toolbar\">\n<pre class=\"line-numbers language-java\"><code class=\"language-java\">  <span class=\"token annotation punctuation\">@api<\/span> counter <span class=\"token operator\">=<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span><\/code><\/pre>\n<div class=\"toolbar\">\n<div class=\"toolbar-item\"><\/div>\n<\/div>\n<\/div>\n<\/li>\n<li><code>api<\/code><span>\u4ece<\/span><code>lwc<\/code><span>\u6a21\u5757\u5bfc\u5165\u88c5\u9970\u5668\u3002<\/span><\/li>\n<li><span>\u4fdd\u5b58\u6587\u4ef6\u3002<\/span><\/li>\n<\/ol>\n<\/li>\n<li><span>\u521b\u5efa\u5e76\u7f16\u5199\u4e00\u4e2a\u540d\u4e3a\u7684\u65b0\u7236\u7ec4\u4ef6<\/span><code>augmentor<\/code><span>\uff1a<\/span>\n<ol>\n<li><span>\u521b\u5efa\u540d\u4e3a\u7684Lightning Web\u7ec4\u4ef6<\/span><code>augmentor<\/code><span>\u3002<\/span><\/li>\n<li><span>\u5728<\/span><strong><span>extraor.js\u4e2d<\/span><\/strong><span>\uff0c\u5c06\u6b64\u4ee3\u7801\u7c98\u8d34\u5230<\/span><code>Augmentor<\/code><span>\u7c7b\u4e2d\uff1a<\/span>\n<div class=\"code-toolbar\">\n<pre class=\"line-numbers language-java\"><code class=\"language-java\">  startCounter <span class=\"token operator\">=<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span>\n  \n  <span class=\"token function\">handleStartChange<\/span><span class=\"token punctuation\">(<\/span>event<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span>\n    <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>startCounter <span class=\"token operator\">=<\/span> <span class=\"token function\">parseInt<\/span><span class=\"token punctuation\">(<\/span>event<span class=\"token punctuation\">.<\/span>target<span class=\"token punctuation\">.<\/span>value<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\n  <span class=\"token punctuation\">}<\/span><\/code><\/pre>\n<div class=\"toolbar\">\n<div class=\"toolbar-item\"><\/div>\n<\/div>\n<\/div>\n<\/li>\n<li><span>\u4fdd\u5b58\u6587\u4ef6\u3002<\/span><\/li>\n<li><span>\u6253\u5f00<\/span><strong><span>exporor.html\uff0c<\/span><\/strong><span>\u5e76\u5728<\/span><code>template<\/code><span>\u6807\u7b7e\u4e4b\u95f4\u6dfb\u52a0\u4ee5\u4e0b\u4ee3\u7801\u00a0\uff1a<\/span>\n<div class=\"code-toolbar\">\n<pre class=\"line-numbers language-java\"><code class=\"language-java\">  <span class=\"token operator\">&lt;<\/span>lightning<span class=\"token operator\">-<\/span>card title<span class=\"token operator\">=<\/span><span class=\"token string\">\"Augmentor\"<\/span> icon<span class=\"token operator\">-<\/span>name<span class=\"token operator\">=<\/span><span class=\"token string\">\"action:download\"<\/span><span class=\"token operator\">&gt;<\/span>\n    <span class=\"token operator\">&lt;<\/span>lightning<span class=\"token operator\">-<\/span>layout<span class=\"token operator\">&gt;<\/span>\n      <span class=\"token operator\">&lt;<\/span>lightning<span class=\"token operator\">-<\/span>layout<span class=\"token operator\">-<\/span>item flexibility<span class=\"token operator\">=<\/span><span class=\"token string\">\"auto\"<\/span> padding<span class=\"token operator\">=<\/span><span class=\"token string\">\"around-small\"<\/span><span class=\"token operator\">&gt;<\/span>\n        <span class=\"token operator\">&lt;<\/span>lightning<span class=\"token operator\">-<\/span>input\n          label<span class=\"token operator\">=<\/span><span class=\"token string\">\"Set Starting Counter\"<\/span>\n          type<span class=\"token operator\">=<\/span><span class=\"token string\">\"number\"<\/span>\n          min<span class=\"token operator\">=<\/span><span class=\"token string\">\"0\"<\/span>\n          max<span class=\"token operator\">=<\/span><span class=\"token string\">\"1000000\"<\/span>\n          value<span class=\"token operator\">=<\/span><span class=\"token punctuation\">{<\/span>startCounter<span class=\"token punctuation\">}<\/span>\n          onchange<span class=\"token operator\">=<\/span><span class=\"token punctuation\">{<\/span>handleStartChange<span class=\"token punctuation\">}<\/span><span class=\"token operator\">&gt;<\/span>\n        <span class=\"token operator\">&lt;<\/span><span class=\"token operator\">\/<\/span>lightning<span class=\"token operator\">-<\/span>input<span class=\"token operator\">&gt;<\/span>\n      <span class=\"token operator\">&lt;<\/span><span class=\"token operator\">\/<\/span>lightning<span class=\"token operator\">-<\/span>layout<span class=\"token operator\">-<\/span>item<span class=\"token operator\">&gt;<\/span>\n    <span class=\"token operator\">&lt;<\/span><span class=\"token operator\">\/<\/span>lightning<span class=\"token operator\">-<\/span>layout<span class=\"token operator\">&gt;<\/span>\n    <span class=\"token operator\">&lt;<\/span>c<span class=\"token operator\">-<\/span>numerator\n      <span class=\"token keyword\">class<\/span><span class=\"token operator\">=<\/span><span class=\"token string\">\"slds-show slds-is-relative\"<\/span>\n      counter<span class=\"token operator\">=<\/span><span class=\"token punctuation\">{<\/span>startCounter<span class=\"token punctuation\">}<\/span><span class=\"token operator\">&gt;<\/span>\n    <span class=\"token operator\">&lt;<\/span><span class=\"token operator\">\/<\/span>c<span class=\"token operator\">-<\/span>numerator<span class=\"token operator\">&gt;<\/span>\n  <span class=\"token operator\">&lt;<\/span><span class=\"token operator\">\/<\/span>lightning<span class=\"token operator\">-<\/span>card<span class=\"token operator\">&gt;<\/span><\/code><\/pre>\n<div class=\"toolbar\">\n<div class=\"toolbar-item\"><\/div>\n<\/div>\n<\/div>\n<\/li>\n<li><span>\u4fdd\u5b58\u6587\u4ef6\u3002<\/span><\/li>\n<li><span>\u66f4\u65b0<\/span><strong><span>exporor.js-meta.xml\uff0c<\/span><\/strong><span>\u4ee5\u5728Lightning\u5e94\u7528\u7a0b\u5e8f\u9875\u9762\u4e0a\u4f7f<strong>\u589e\u5f3a<\/strong>\u5668\u7ec4\u4ef6\u53ef\u7528\uff1a<\/span>\n<div class=\"code-toolbar\">\n<pre class=\"line-numbers language-java\"><code class=\"language-java\">    <span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span>isExposed<span class=\"token punctuation\">&gt;<\/span><\/span><span class=\"token boolean\">true<\/span><span class=\"token operator\">&lt;<\/span><span class=\"token operator\">\/<\/span>isExposed<span class=\"token operator\">&gt;<\/span>\n    <span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span>targets<span class=\"token punctuation\">&gt;<\/span><\/span>\n      <span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span>target<span class=\"token punctuation\">&gt;<\/span><\/span>lightning__AppPage<span class=\"token operator\">&lt;<\/span><span class=\"token operator\">\/<\/span>target<span class=\"token operator\">&gt;<\/span>\n    <span class=\"token operator\">&lt;<\/span><span class=\"token operator\">\/<\/span>targets<span class=\"token operator\">&gt;<\/span><\/code><\/pre>\n<div class=\"toolbar\">\n<div class=\"toolbar-item\"><\/div>\n<\/div>\n<\/div>\n<\/li>\n<li><span>\u4fdd\u5b58\u6587\u4ef6\u3002<\/span><\/li>\n<\/ol>\n<\/li>\n<li><span>\u5c06\u65b0\u7ec4\u4ef6\uff08\u589e\u5f3a\u5668\uff09\u6dfb\u52a0\u5230Event Comms\u5e94\u7528\u7a0b\u5e8f\u9875\u9762\uff1a<\/span>\n<ol>\n<li><span>\u90e8\u7f72<\/span><strong><span>lwc<\/span><\/strong><span>\u6587\u4ef6\u5939\uff0c\u7136\u540e\u5237\u65b0Event Comms\u5e94\u7528\u7a0b\u5e8f\u9875\u9762\u3002<\/span><\/li>\n<li><span>\u6253\u5f00<\/span><strong><span>Event Comms<\/span><\/strong><span>\u5e94\u7528\u9875\u9762\u8fdb\u884c\u7f16\u8f91\u3002<\/span><\/li>\n<li><span>\u5c06<\/span><strong><span>\u6269\u5145\u5668<\/span><\/strong><span>\u7ec4\u4ef6<strong>\u62d6\u5230<\/strong>\u9875\u9762\u7684\u4e2d\u592e\u533a\u57df\u3002<\/span><\/li>\n<li><span>\u5355\u51fb\u201c<\/span><strong><span>\u4fdd\u5b58\u201d<\/span><\/strong><span>\uff0c\u7136\u540e\u9000\u51faLightning App Builder\u3002<\/span><\/li>\n<\/ol>\n<\/li>\n<li><span>\u9a8c\u8bc1\u901a\u8baf\uff1a<\/span>\n<ol>\n<li><span>\u8981\u67e5\u770bSalesforce\u4e2d\u7684\u66f4\u6539\uff0c\u8bf7\u5237\u65b0Event Comms\u5e94\u7528\u7a0b\u5e8f\u9875\u9762\u3002<\/span><\/li>\n<li><span>\u5728\u8bbe\u7f6e\u8d77\u59cb\u8ba1\u6570\u5668\u5b57\u6bb5\u4e2d\u8f93\u5165\u6570\u5b57\u3002<\/span><br \/>\n<span>\u8ba1\u6570\u5c06\u66f4\u65b0\u4e3a\u60a8\u8f93\u5165\u7684\u5185\u5bb9\u3002<\/span><\/li>\n<li><span>\u5355\u51fb\u4e58\u6cd5\u6309\u94ae\u4e4b\u4e00\u3002<\/span><br \/>\n<span>\u8bf7\u6ce8\u610f\uff0c\u8ba1\u6570\u5668\u4f1a\u66f4\u65b0\uff0c\u4f46\u201c\u8bbe\u7f6e\u8d77\u59cb\u8ba1\u6570\u5668\u201d\u4fdd\u6301\u4e0d\u53d8\u3002<\/span><\/li>\n<li><span>\u66f4\u6539\u539f\u59cb\u5206\u5b50\u7ec4\u4ef6\u4e2d\u7684\u503c\u3002<\/span><br \/>\n<span>\u5b83\u7ee7\u7eed\u6309\u9884\u671f\u5de5\u4f5c\u3002<\/span><\/li>\n<\/ol>\n<\/li>\n<\/ol>\n<p><img decoding=\"async\" class=\"image\" src=\"https:\/\/res.cloudinary.com\/hy4kyit2a\/f_auto,fl_lossy,q_70\/learn\/projects\/communicate-between-lightning-web-components\/communicate-from-parent-to-child\/images\/b809f56193f67ae54cb4afd55f3bcfd6_29-e-48-b-3-e-f-86-d-47-a-7-b-260-759-cee-275465.png\" alt=\"\u7236\u7ec4\u4ef6\uff08\u589e\u5f3a\u5668\uff09\u5c06\u4fe1\u606f\uff08startCounter\uff09\u53d1\u9001\u5230\u5b50\u7ec4\u4ef6\uff08\u5206\u5b50\uff09\u4e2d\u7684\u8ba1\u6570\u5668\u5c5e\u6027\u3002\" width=\"330\" \/><\/p>\n<p><span>\u56e0\u4e3a\u6211\u4eec\u5c06\u201c\u8bbe\u7f6e\u8d77\u59cb\u8ba1\u6570\u5668\u201d\u653e\u5728\u5176\u81ea\u5df1\u7684\u7ec4\u4ef6\uff08\u589e\u5f3a\u5668\uff09\u4e2d\uff0c\u6240\u4ee5\u6ca1\u6709\u5c06\u5176\u6dfb\u52a0\u5230\u5206\u5b50\u7ec4\u4ef6\u4e2d\uff0c\u800c\u662f\u7ee7\u7eed\u4e3a\u539f\u59cb\u4e1a\u52a1\u6848\u4f8b\u63d0\u4f9b\u670d\u52a1\u3002\u73b0\u5728\u5206\u5b50\u4ece\u5b50\u7ea7\uff08\u63a7\u4ef6\uff09\u548c\u7236\u7ea7\uff08\u589e\u5f3a\u5668\uff09\u63a5\u6536\u8f93\u5165\u3002<\/span><\/p>\n<h2 id=\"call-a-public-function\"><span>\u8c03\u7528\u516c\u5171\u529f\u80fd<\/span><\/h2>\n<p><span>\u8be5\u4e1a\u52a1\u7684\u7b2c\u4e8c\u4e2a\u8bf7\u6c42\u662f\u5c06\u603b\u6570\u589e\u52a0\u4e00\u767e\u4e07\u3002\u4ed6\u4eec\u4e0d\u5e0c\u671b\u8bbe\u7f6e\u5f00\u59cb\u8ba1\u6570\u53d1\u751f\u53d8\u5316\u3002\u8fd9\u610f\u5473\u7740\u6211\u4eec\u4e0d\u80fd\u53ea\u66f4\u65b0startCounter\u5c5e\u6027\u3002\u6211\u4eec\u4e5f\u6ca1\u6709\u8981\u6dfb\u52a0\u7684\u6269\u5145\u5668\u7ec4\u4ef6\u4e2d\u7684\u5f53\u524d\u8ba1\u6570\u3002\u6211\u4eec\u5c06\u5bf9\u5b69\u5b50\u8c03\u7528\u4e00\u4e2a\u516c\u5171\u51fd\u6570\u6765\u4e3a\u6211\u4eec\u8fdb\u884c\u66f4\u65b0\u3002<\/span><\/p>\n<p><code>@api<\/code><span>\u5b50\u7ec4\u4ef6\u4e2d\u7684\u88c5\u9970\u5668\u516c\u5f00\u4e00\u4e2a\u51fd\u6570\uff0c\u4f7f\u5176\u516c\u5f00\uff0c\u4ee5\u4fbf\u7236\u7ec4\u4ef6\u53ef\u4ee5\u8c03\u7528\u5b83\u3002<\/span><\/p>\n<ol>\n<li><span>\u5728\u5b50\u7ec4\u4ef6\uff08\u5206\u5b50\uff09\u4e2d\u521b\u5efa\u4e00\u4e2a\u516c\u5171\u51fd\u6570\uff1a<\/span>\n<ol>\n<li><span>\u6253\u5f00<\/span><strong><span>numerator.js<\/span><\/strong><span>\u5e76\u5c06\u6b64<\/span><code>maximizeCounter<\/code><span>\u51fd\u6570\u6dfb\u52a0\u5230\u8be5\u51fd\u6570\u4e4b\u540e<\/span><code>handleMultiply<\/code><span>\uff1a<\/span>\n<div class=\"code-toolbar\">\n<pre class=\"line-numbers language-java\"><code class=\"language-java\">  <span class=\"token annotation punctuation\">@api<\/span>\n  <span class=\"token function\">maximizeCounter<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span>\n    <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>counter <span class=\"token operator\">+=<\/span> <span class=\"token number\">1000000<\/span><span class=\"token punctuation\">;<\/span>\n  <span class=\"token punctuation\">}<\/span><\/code><\/pre>\n<div class=\"toolbar\">\n<div class=\"toolbar-item\"><\/div>\n<\/div>\n<\/div>\n<\/li>\n<li><span>\u4fdd\u5b58\u6587\u4ef6\u3002<\/span><\/li>\n<\/ol>\n<\/li>\n<li><span>\u5728\u7236\u7ec4\u4ef6\uff08\u589e\u5f3a\u5668\uff09\u4e2d\uff0c\u6dfb\u52a0\u4e00\u4e2a\u6309\u94ae\u53ca\u5176\u5904\u7406\u7a0b\u5e8f\uff1a<\/span>\n<ol>\n<li><span>\u6253\u5f00<\/span><strong><span>exporor.js\uff0c<\/span><\/strong><span>\u5e76\u5728<\/span><code>handleMaximizeCounter<\/code><span>\u00a0\u51fd\u6570\u540e\u6dfb\u52a0\u4ee5\u4e0b<\/span><code>handleStartChange<\/code><span>\u51fd\u6570\uff1a<\/span>\n<div class=\"code-toolbar\">\n<pre class=\"line-numbers language-java\"><code class=\"language-java\">  <span class=\"token function\">handleMaximizeCounter<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span>\n    <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>template<span class=\"token punctuation\">.<\/span><span class=\"token function\">querySelector<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">'c-numerator'<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">maximizeCounter<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\n  <span class=\"token punctuation\">}<\/span><\/code><\/pre>\n<div class=\"toolbar\">\n<div class=\"toolbar-item\"><\/div>\n<\/div>\n<\/div>\n<p><span>\u8be5\u51fd\u6570<\/span><code>c-numerator<\/code><span>\u5728exporor.html\u4e2d\u627e\u5230\u6807\u7b7e\u5e76\u8c03\u7528\u516c\u5171<\/span><code>maximizeCounter<\/code><span>\u51fd\u6570\u3002<\/span><\/li>\n<li><span>\u4fdd\u5b58\u6587\u4ef6\u3002<\/span><\/li>\n<li><span>\u6253\u5f00<\/span><strong><span>exporor.html<\/span><\/strong><span>\uff0c\u5e76\u5c06\u5176\u6dfb\u52a0<\/span><code>lightning-button<\/code><span>\u5230Set Starting Counter\u4e4b\u540e<\/span><code>lightning-input<\/code><span>\uff1a<\/span>\n<div class=\"code-toolbar\">\n<pre class=\"line-numbers language-java\"><code class=\"language-java\">        <span class=\"token operator\">&lt;<\/span>lightning<span class=\"token operator\">-<\/span>button \n          <span class=\"token keyword\">class<\/span><span class=\"token operator\">=<\/span><span class=\"token string\">\"slds-var-p-vertical_xx-small\"<\/span>\n          label<span class=\"token operator\">=<\/span><span class=\"token string\">\"Add 1m To Counter\"<\/span>\n          onclick<span class=\"token operator\">=<\/span><span class=\"token punctuation\">{<\/span>handleMaximizeCounter<span class=\"token punctuation\">}<\/span><span class=\"token operator\">&gt;<\/span>\n        <span class=\"token operator\">&lt;<\/span><span class=\"token operator\">\/<\/span>lightning<span class=\"token operator\">-<\/span>button<span class=\"token operator\">&gt;<\/span><\/code><\/pre>\n<div class=\"toolbar\">\n<div class=\"toolbar-item\"><\/div>\n<\/div>\n<\/div>\n<\/li>\n<li><span>\u4fdd\u5b58\u6587\u4ef6\u3002<\/span><\/li>\n<\/ol>\n<\/li>\n<li><span>\u9a8c\u8bc1\u901a\u8baf\uff1a<\/span>\n<ol>\n<li><span>\u8981\u67e5\u770bSalesforce\u4e2d\u7684\u66f4\u6539\uff0c\u8bf7\u90e8\u7f72<\/span><strong><span>lwc<\/span><\/strong><span>\u6587\u4ef6\u5939\uff0c\u7136\u540e\u5237\u65b0Event Comms\u5e94\u7528\u7a0b\u5e8f\u9875\u9762\u3002<\/span><\/li>\n<li><span>\u5355\u51fb\u201c<\/span><strong><span>\u6dfb\u52a01m\u5230\u8ba1\u6570\u5668\u201d<\/span><\/strong><span>\u3002<\/span><br \/>\n<span>\u6570\u91cf\u589e\u52a0\u4e86\u4e00\u767e\u4e07\u3002<\/span><\/li>\n<\/ol>\n<\/li>\n<\/ol>\n<p><span>\u5728\u7236\u7ea7\uff08\u589e\u5f3a\u5668\uff09\u4e2d\uff0c\u65b0\u6309\u94ae\u89e6\u53d1<\/span><code>handleMaximizeCounter<\/code><span>\u00a0\u5904\u7406\u7a0b\u5e8f\uff0c\u8be5\u5904\u7406\u7a0b\u5e8f\u8c03\u7528\u5b50\u7ea7\u7ec4\u4ef6\uff08\u5206\u5b50\uff09\u5e76\u89e6\u53d1\u5176\u516c\u5171\u00a0<\/span><code>maximizeCounter<\/code><span>\u529f\u80fd\u3002<\/span><\/p>\n<p><img decoding=\"async\" class=\"image\" src=\"https:\/\/res.cloudinary.com\/hy4kyit2a\/f_auto,fl_lossy,q_70\/learn\/projects\/communicate-between-lightning-web-components\/communicate-from-parent-to-child\/images\/856d207704fbcfc294e780c7e56d5c3e_4-e-855-db-8-88-ab-486-d-858-e-7919-eda-9879-a.png\" alt=\"\u4e0e\u524d\u9762\u7684\u63cf\u8ff0\u76f8\u5bf9\u5e94\u7684\u56fe\u3002\" width=\"330\" \/><\/p>\n<h2 id=\"use-a-public-getter-and-setter\"><span>\u4f7f\u7528\u516c\u5171Getter\u548cSetter<\/span><\/h2>\n<p><span>\u6b64\u7ec3\u4e60\u4e0e\u5728\u6b64\u6b65\u9aa4\u5f00\u59cb\u65f6\u66f4\u65b0\u5c5e\u6027\u7684\u65b9\u5f0f\u975e\u5e38\u76f8\u4f3c\u3002\u5b9e\u9645\u4e0a\uff0c\u6211\u4eec\u6839\u672c\u4e0d\u4f1a\u66f4\u6539\u7236\u7ec4\u4ef6\u3002\u5728\u5b50\u7ec4\u4ef6\u4e2d\uff0c\u6211\u4eec\u4ec5\u4f7f\u7528\u516c\u5171\u83b7\u53d6\u5668\u548c\u8bbe\u7f6e\u5668\u6765\u5b9e\u73b0\u516c\u5171\u67dc\u53f0\u5c5e\u6027\u3002<\/span><\/p>\n<p><span>\u4f7f\u7528Event Comms\u7684\u4e24\u4e2a\u4e1a\u52a1\u90e8\u95e8\u90fd\u559c\u6b22\u66f4\u65b0\u3002\u73b0\u5728\u4ed6\u4eec\u5e0c\u671b\u968f\u7740\u8ba1\u6570\u7684\u53d8\u5316\u770b\u5230\u8ba1\u6570\u7684\u5148\u524d\u503c\u3002\u6bcf\u5f53\u66f4\u6539\u8ba1\u6570\u5668\u5c5e\u6027\u65f6\uff0c\u6211\u4eec\u90fd\u9700\u8981\u4e00\u79cd\u65b9\u6cd5\u6765\u6355\u83b7\u5f53\u524d\u8ba1\u6570\u3002\u5728\u8bbe\u7f6e\u65b0\u503c\u4e4b\u524d\uff0c\u6211\u4eec\u53ef\u4ee5\u83b7\u53d6\u5f53\u524d\u8ba1\u6570\u5e76\u4fdd\u5b58\u5b83\u3002\u8ba9\u6211\u4eec\u4f7f\u7528\u4e00\u4e2a\u540d\u4e3a\u7684\u65b0\u79c1\u6709\u53d8\u91cf\uff0c<\/span><code>_currentCount<\/code><span>\u4ee5\u4fbf\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528\u5b83\u3002\u4e3a\u4e86\u4fdd\u5b58\u5148\u524d\u7684\u8ba1\u6570\u4ee5\u4fbf\u6211\u4eec\u53ef\u4ee5\u663e\u793a\u5b83\uff0c\u6211\u4eec\u5c06\u4f7f\u7528\u4e00\u4e2a\u540d\u4e3a\u7684\u53d8\u91cf\u00a0<\/span><code>priorCount<\/code><span>\u3002<\/span><\/p>\n<p><span>\u5bf9\u4e8e\u5176\u4ed6\u529f\u80fd\uff0c\u6211\u4eec\u5c06\u8be5<\/span><code>counter<\/code><span>\u5c5e\u6027\u5b9e\u73b0\u4e3agetter\u548csetter\uff08<\/span><code>get<\/code><span>\u548c<\/span><code>set<\/code><span>\uff0c\u4e5f\u79f0\u4e3a\u8bbf\u95ee\u5668\u5c5e\u6027\uff09\u3002\u7136\u540e\uff0c\u6bcf\u6b21\u8bbe\u7f6e\u8ba1\u6570\u5668\u65f6\uff0c\u6211\u4eec\u90fd\u4f1a\u5728\u8bbe\u7f6e\u65b0\u7684\u8ba1\u6570\u5668\u503c\u4e4b\u524d\u5c06\u5f53\u524d\u8ba1\u6570\u5668\u503c\uff08<\/span><code>_currentCount<\/code><span>\uff09\u5b58\u50a8\u5728<\/span><code>priorCount<\/code><span>\u53d8\u91cf\u4e2d\u3002<\/span><\/p>\n<ol>\n<li><span>\u5411\u5b50\u7ec4\u4ef6\uff08\u5206\u5b50\uff09\u6dfb\u52a0\u4e00\u4e2a\u5148\u9a8c\u8ba1\u6570\uff1a<\/span>\n<ol>\n<li><span>\u6253\u5f00<\/span><strong><span>numerator.html<\/span><\/strong><span>\u5e76\u5c06\u6b64\u6bb5\u843d\u6dfb\u52a0\u5230\u5e26\u6709Count\u7684\u6bb5\u843d\u4e4b\u524d\uff1a<\/span>\n<div class=\"code-toolbar\">\n<pre class=\"line-numbers language-java\"><code class=\"language-java\">      <span class=\"token operator\">&lt;<\/span>p <span class=\"token keyword\">class<\/span><span class=\"token operator\">=<\/span><span class=\"token string\">\"slds-text-align_center slds-var-m-vertical_medium\"<\/span><span class=\"token operator\">&gt;<\/span>\n        <span class=\"token class-name\">Prior<\/span> <span class=\"token class-name\">Count<\/span><span class=\"token operator\">:<\/span> <span class=\"token operator\">&lt;<\/span>lightning<span class=\"token operator\">-<\/span>formatted<span class=\"token operator\">-<\/span>number value<span class=\"token operator\">=<\/span><span class=\"token punctuation\">{<\/span>priorCount<span class=\"token punctuation\">}<\/span><span class=\"token operator\">&gt;<\/span><span class=\"token operator\">&lt;<\/span><span class=\"token operator\">\/<\/span>lightning<span class=\"token operator\">-<\/span>formatted<span class=\"token operator\">-<\/span>number<span class=\"token operator\">&gt;<\/span>\n      <span class=\"token operator\">&lt;<\/span><span class=\"token operator\">\/<\/span>p<span class=\"token operator\">&gt;<\/span><\/code><\/pre>\n<div class=\"toolbar\">\n<div class=\"toolbar-item\"><\/div>\n<\/div>\n<\/div>\n<\/li>\n<li><span>\u4fdd\u5b58\u6587\u4ef6\u3002<\/span><\/li>\n<li><span>\u6253\u5f00<\/span><strong><span>numerator.js<\/span><\/strong><span>\u5e76\u8fdb\u884c<\/span><code>@api counter = 0;<\/code><span>\u6ce8\u91ca\uff08\u6dfb\u52a0<\/span><code>\/\/<\/code><span>\u5230\u8be5\u884c\u7684\u5f00\u5934\uff09\u3002<\/span><\/li>\n<li><span>\u5728\u8bc4\u8bba\u4e4b\u540e\uff0c\u6dfb\u52a0\u4ee5\u4e0b\u4ee3\u7801\uff1a<\/span>\n<div class=\"code-toolbar\">\n<pre class=\"line-numbers language-java\"><code class=\"language-java\">  _currentCount <span class=\"token operator\">=<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span>\n  priorCount <span class=\"token operator\">=<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span>\n  \n  <span class=\"token annotation punctuation\">@api<\/span>\n  get <span class=\"token function\">counter<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span>\n    <span class=\"token keyword\">return<\/span> <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>_currentCount<span class=\"token punctuation\">;<\/span>\n  <span class=\"token punctuation\">}<\/span>\n  set <span class=\"token function\">counter<\/span><span class=\"token punctuation\">(<\/span>value<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span>\n    <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>priorCount <span class=\"token operator\">=<\/span> <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>_currentCount<span class=\"token punctuation\">;<\/span>\n    <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>_currentCount <span class=\"token operator\">=<\/span> value<span class=\"token punctuation\">;<\/span>\n  <span class=\"token punctuation\">}<\/span><\/code><\/pre>\n<div class=\"toolbar\">\n<div class=\"toolbar-item\"><\/div>\n<\/div>\n<\/div>\n<p><span>\u6b64\u4ee3\u7801<\/span><code>counter<\/code><span>\u4f7f\u7528getter\uff08<\/span><code>get<\/code><span>\uff09\u548csetter\uff08<\/span><code>set<\/code><span>\uff09\u51fd\u6570\u66f4\u6539\u4e3a\u5c5e\u6027\u3002\u5b83\u8fd8\u6dfb\u52a0<\/span><code>priorCount<\/code><span>\u548c\u00a0<\/span><code>_currentCount<\/code><span>\u5c5e\u6027\u3002<\/span><\/li>\n<li><span>\u4fdd\u5b58\u6587\u4ef6\u3002<\/span><\/li>\n<\/ol>\n<\/li>\n<li><span>\u9a8c\u8bc1\u901a\u8baf\uff1a<\/span>\n<ol>\n<li><span>\u8981\u67e5\u770bSalesforce\u4e2d\u7684\u66f4\u6539\uff0c\u8bf7\u90e8\u7f72<\/span><strong><span>lwc<\/span><\/strong><span>\u6587\u4ef6\u5939\uff0c\u7136\u540e\u5237\u65b0Event Comms\u5e94\u7528\u7a0b\u5e8f\u9875\u9762\u3002<\/span><\/li>\n<li><span>\u5355\u51fb\u201c<\/span><strong><span>\u6dfb\u52a0\u201d<\/span><\/strong><span>\uff0c\u201c\u00a0<\/span><strong><span>X2<\/span><\/strong><span>\u00a0\u201d\u548c\u201c<\/span><strong><span>\u5411\u8ba1\u6570\u5668\u6dfb\u52a01m\u201d<\/span><\/strong><span>\u00a0\u4ee5\u66f4\u6539\u8ba1\u6570\u5668\u503c\u3002<\/span><br \/>\n<span>\u66f4\u65b0\u8ba1\u6570\u5668\u65f6\uff0cPrior Counter\u4fdd\u6301\u540c\u6b65\u3002<\/span><\/li>\n<li><span>\u5355\u51fbNumerator\u548cAugmentor\u7ec4\u4ef6\u4e2d\u7684\u6309\u94ae\u4ee5\u67e5\u770b\u539f\u59cb\u529f\u80fd\u4e0d\u53d7\u5f71\u54cd\u3002<\/span><\/li>\n<\/ol>\n<\/li>\n<\/ol>\n<p><span>\u6211\u4eec\u66f4\u65b0\u4e86\u5206\u5b50\u7ec4\u4ef6\uff0c\u4ee5\u4f7f\u7528getter\u548csetter\u6765\u66f4\u65b0\u65b0\u00a0<\/span><code>priorCount<\/code><span>\u5c5e\u6027\u3002\u7236\u7ec4\u4ef6\uff08\u589e\u5f3a\u5668\uff09\u4ecd\u5c06\u4fe1\u606f\uff08<\/span><code>startCounter<\/code><span>\uff09\u53d1\u9001\u5230\u5b50\u7ec4\u4ef6\uff08\u5206\u5b50\uff09\u3002\u4f46\u73b0\u5728\uff0c\u5206\u5b50\u4f7f\u7528getter\u548csetter\u6765<\/span><code>get<\/code><span>\u7684<\/span><code>_currentCount<\/code><span>\u8d22\u4ea7\uff0c<\/span><code>set<\/code><span>\u00a0\u5728<\/span><code>_currentCount<\/code><span>\u548c<\/span><code>priorCount<\/code><span>\u5c5e\u6027\u3002<\/span><\/p>\n<p><img decoding=\"async\" class=\"image\" src=\"https:\/\/res.cloudinary.com\/hy4kyit2a\/f_auto,fl_lossy,q_70\/learn\/projects\/communicate-between-lightning-web-components\/communicate-from-parent-to-child\/images\/1102c04ecd7cc88af989673db70cd398_8102973-c-0-ff-9-48-b-5-b-419-a-0-a-60160-cc-0-a.png\" alt=\"\u4e0e\u524d\u9762\u7684\u63cf\u8ff0\u76f8\u5bf9\u5e94\u7684\u56fe\u3002\" width=\"330\" \/><\/p>\n<p><strong><span>\u6311\u6218\u81ea\u5df1<\/span><\/strong><span>\uff08\u53ef\u9009-\u6211\u4eec\u5c06\u4e0d\u68c0\u67e5\u6b64\u4ee3\u7801\uff09<\/span><br \/>\n<span>\u66f4\u65b0<\/span><code>handleMaximizeCounter<\/code><span>\u5e76<\/span><code>maximizeCounter<\/code><span>\u63a5\u53d7\u4e00\u4e2a\u53c2\u6570\uff0c\u8be5\u53c2\u6570\u6307\u5b9a\u8981\u6dfb\u52a0\u5230\u8ba1\u6570\u4e2d\u7684\u6570\u5b57\u3002\u63d0\u793a\uff1a\u56de\u987e\u4f60\u5728\u6b65\u9aa41\u4e2d\u6240\u505a\u7684\u53d1\u9001\u00a0<\/span><code>data-factor<\/code><span>\u4e0e<\/span><code>multiply<\/code><span>\u81ea\u5b9a\u4e49\u4e8b\u4ef6\u3002<\/span><\/p>\n<h2 id=\"summary\"><span>\u6982\u8981<\/span><\/h2>\n<p><span>\u60a8\u5df2\u7ecf\u89e3\u51b3\u4e86Lightning Web\u7ec4\u4ef6\u4e4b\u95f4\u7684\u5b50\u5bf9\u7236\u548c\u7236\u5b50\u5bf9\u5b50\u901a\u4fe1\u3002\u5728\u4e0b\u4e00\u6b65\u4e2d\uff0c\u60a8\u5c06\u4f7f\u7528Lightning\u6d88\u606f\u670d\u52a1\u5728\u6ca1\u6709\u7236\u5b50\u5173\u7cfb\u7684\u7ec4\u4ef6\u4e4b\u95f4\u8fdb\u884c\u901a\u4fe1\u3002<\/span><\/p>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>\u7236\u6bcd\u4e0e\u5b69\u5b50\u6c9f\u901a \u4e3a\u4e86\u542f\u7528\u4ece\u7236\u7ec4\u4ef6\u5230\u5b50\u7ec4\u4ef6\u7684\u901a\u4fe1\uff0c\u5b50\u7ec4\u4ef6\u516c\u5f00\u4e00\u4e2a\u5c5e\u6027\u6216\u51fd\u6570\u4ee5\u4f7f\u5176\u516c\u5f00\u3002\u7136\u540e\uff0c\u7236\u6bcd\u53ef\u4ee5\u66f4\u65b0\u5b69\u5b50\u7684\u516c &hellip; <a href=\"http:\/\/www.ponybai.com\/?p=3313\" class=\"more-link\">\u7ee7\u7eed\u9605\u8bfb<span class=\"screen-reader-text\">\u5728\u95ea\u7535Web\u7ec4\u4ef6\u4e4b\u95f4\u901a\u4fe1 &#8211; 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