docs: add maintain tip

Co-authored-by: MozartHero <liulu06@qianxin.com>

docs/markdown/changelog.en-US.md

@@ -16,6 +16,19 @@ Vant follows [Semantic Versioning 2.0.0](https://semver.org/lang/zh-CN/).
 
 ## Details
 
+### [v2.12.43](https://github.com/youzan/vant/compare/v2.12.39...v2.12.43)
+
+`2022-02-10`
+
+**Feature**
+
+- Cascader: add show-header prop [#10201](https://github.com/youzan/vant/issues/10201)
+- CollapseItem: add lazy-render prop [#10279](https://github.com/youzan/vant/issues/10279)
+
+**Bug Fixes**
+
+- Icon: remove white space under image when using image URL [#10224](https://github.com/youzan/vant/issues/10224)
+
 ### [v2.12.42](https://github.com/youzan/vant/compare/v2.12.41...v2.12.42)
 
 `2022-02-07`

docs/markdown/changelog.zh-CN.md

@@ -14,8 +14,27 @@ Vant 遵循 [Semver](https://semver.org/lang/zh-CN/) 语义化版本规范。
 - 次版本号：每隔一至二个月发布，包含新特性和较大的功能更新，向下兼容。
 - 主版本号：无固定发布时间，包含不兼容更新。
 
+**维护提示**
+
+- Vant 2 版本已经不再主动迭代新 Feature，如果你仍在使用 Vue 2 & Vant 2，建议尽快进行升级。
+
+- 考虑到仍然有较多用户在使用 Vue 2，我们会对 Vant 2 中影响面较大的 Bug 进行修复，也接受来自社区的 Pull Request，欢迎贡献代码 ^\_^
+
 ## 更新内容
 
+### [v2.12.43](https://github.com/youzan/vant/compare/v2.12.39...v2.12.43)
+
+`2022-02-10`
+
+**Feature**
+
+- Cascader: 新增 show-header 属性 [#10201](https://github.com/youzan/vant/issues/10201)
+- CollapseItem: 新增 lazy-render 属性 [#10279](https://github.com/youzan/vant/issues/10279)
+
+**Bug Fixes**
+
+- Icon: 修复使用图片作为图标时水平未对齐的问题 [#10224](https://github.com/youzan/vant/issues/10224)
+
 ### [v2.12.42](https://github.com/youzan/vant/compare/v2.12.41...v2.12.42)
 
 `2022-02-07`

package.json

@@ -1,6 +1,6 @@
 {
   "name": "vant",
-  "version": "2.12.42",
+  "version": "2.12.43",
   "description": "Mobile UI Components built on Vue",
   "main": "lib/index.js",
   "module": "es/index.js",

src/collapse-item/index.js

@@ -20,6 +20,10 @@ export default createComponent({
     ...cellProps,
     name: [Number, String],
     disabled: Boolean,
+    lazyRender: {
+      type: Boolean,
+      default: true,
+    },
     isLink: {
       type: Boolean,
       default: true,
@@ -155,7 +159,7 @@ export default createComponent({
     },
 
     genContent() {
-      if (this.inited) {
+      if (this.inited || !this.lazyRender) {
         return (
           <div
             vShow={this.show}

src/collapse/README.md

@@ -127,6 +127,7 @@ export default {
 | border | Whether to show inner border | _boolean_ | `true` |
 | disabled | Whether to disabled collapse | _boolean_ | `false` |
 | is-link | Whether to show link icon | _boolean_ | `true` |
+| lazy-render `v2.12.43` | Whether to lazy render util opened | _boolean_ | `true` |
 | title-class | Title className | _string_ | - |
 | value-class | Value className | _string_ | - |
 | label-class | Label className | _string_ | - |

src/collapse/README.zh-CN.md

@@ -129,6 +129,7 @@ export default {
 | border | 是否显示内边框 | _boolean_ | `true` |
 | is-link | 是否展示标题栏右侧箭头并开启点击反馈 | _boolean_ | `true` |
 | disabled | 是否禁用面板 | _boolean_ | `false` |
+| lazy-render `v2.12.43` | 是否在首次展开时才渲染面板内容 | _boolean_ | `true` |
 | title-class | 左侧标题额外类名 | _string_ | - |
 | value-class | 右侧内容额外类名 | _string_ | - |
 | label-class | 描述信息额外类名 | _string_ | - |

vant.config.js

@@ -25,7 +25,7 @@ module.exports = {
     },
     locales: {
       'zh-CN': {
-        title: 'Vant',
+        title: 'Vant 2',
         description: '轻量、可靠的移动端组件库',
         logo: 'https://img01.yzcdn.cn/vant/logo.png',
         langLabel: '中文',
@@ -443,7 +443,7 @@ module.exports = {
         ],
       },
       'en-US': {
-        title: 'Vant',
+        title: 'Vant 2',
         description: 'Mobile UI Components built on Vue',
         logo: 'https://img01.yzcdn.cn/vant/logo.png',
         langLabel: 'En',