mirror of
https://github.com/node-red/node-red.git
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34 lines
1.5 KiB
HTML
34 lines
1.5 KiB
HTML
<!--
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Copyright JS Foundation and other contributors, http://js.foundation
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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-->
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<script type="text/html" data-help-name="change">
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<p>设置，更改，删除或移动消息，流上下文或全局上下文的属性。</p>
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<p>如果指定了多个规则，则将按定义的顺序来应用它们。</p>
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<h3>详细</h3>
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<p>可用的操作有：</p>
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<dl class="message-properties">
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<dt>设置</dt>
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<dd>设置一个属性。该值可以是多种不同类型，也可以从现有消息或上下文属性中获取。</dd>
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<dt>置换</dt>
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<dd>搜索并替换属性。 如果启用了正则表达式，则可以为“replace with”属性指定捕获组，例如<code>$1</code>。 在替换过程中，仅当规则完全匹配时才能更改属性类型。</dd>
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<dt>删除</dt>
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<dd>删除一个属性</dd>
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<dt>移动</dt>
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<dd>移动或者重命名一个属性</dd>
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</dl>
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<p>类型"expression"使用<a href="http://jsonata.org/" target="_new">JSONata</a>语言。</p>
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</script>
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