doc fix
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---
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title: 表达式
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description:
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description:
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type: 0
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group: 💡 概念
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menuName: 表达式
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icon:
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icon:
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order: 13
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---
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一般来说,属性名类似于`xxxOn`的配置项,都可以使用表达式进行配置,表达式具有如下的语法:
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```json
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{
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"type": "tpl",
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"tpl": "当前作用域中变量 show 是 1 的时候才可以看得到我哦~",
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"visibleOn": "data.show === 1"
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"visibleOn": "data.show === 1"
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}
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```
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在 amis 的实现过程中,当正则匹配到某个组件存在`xxxOn`语法的属性名时,会尝试进行下面步骤(以上面配置为例):
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1. 提取`visibleOn`配置项配置的 JavaScript 语句`data.show === 1`,并以当前组件的数据域为这段代码的数据作用域,执行这段js代码;
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1. 提取`visibleOn`配置项配置的 JavaScript 语句`data.show === 1`,并以当前组件的数据域为这段代码的数据作用域,执行这段 js 代码;
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2. 之后将执行结果赋值给`visible`并添加到组件属性中
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3. 执行渲染。当前示例中:`visible`代表着是否显示当前组件;
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组件不同的配置项会有不同的效果,请大家在组件文档中多留意。
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> 表达式的执行结果预期应该是`boolean`类型值,如果不是,amis 会根据 JavaScript 的规则将结果视作`boolean`类型进行判断
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@ -652,9 +652,9 @@ export const docs = [
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},
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{
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label: 'ButtonGroup 按钮组',
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path: '/docs/components/buttongroup',
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path: '/docs/components/button-group',
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getComponent: (location, cb) =>
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require(['../../docs/components/buttongroup.md'], doc => {
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require(['../../docs/components/button-group.md'], doc => {
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cb(null, makeMarkdownRenderer(doc));
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})
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},
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@ -251,7 +251,7 @@ export default function (doc) {
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</div>
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</div>
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</div>
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{doc.toc && doc.toc.children && doc.toc.children.length > 1 ? (
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{doc.toc && doc.toc.children && doc.toc.children.length > 0 ? (
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<div className="Doc-toc hidden-xs hidden-sm">
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<div>
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<div className="Doc-headingList">
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examples/doc.css
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examples/doc.css
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> pre {
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margin-bottom: 30px;
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}
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table:not(.table) {
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word-break: break-word;
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}
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}
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}
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