[{"id":"bcb0874d-299b-448e-9552-9e9b25ef80dd","tags":[{"product":null,"links":null,"id":"ba7e818e-4f6b-4211-b1ac-58e3bafcf439","name":"\u66F4\u65B0","color":"orange","productId":"0995490e-43fc-4d6e-bc8d-8e66f38b0c63"}]},{"id":"ae60ae59-34f5-4f32-a8eb-243ed1457543","tags":[{"product":null,"links":null,"id":"adf72f47-7f61-4239-8392-b9bcc127fa80","name":"\u65B0\u589E","color":"green","productId":"0995490e-43fc-4d6e-bc8d-8e66f38b0c63"}]},{"id":"3d4848c3-910f-4ffa-9153-60bb507334a9","tags":[{"product":null,"links":null,"id":"adf72f47-7f61-4239-8392-b9bcc127fa80","name":"\u65B0\u589E","color":"green","productId":"0995490e-43fc-4d6e-bc8d-8e66f38b0c63"}]},{"id":"133f4ca6-d951-4d65-a618-3dc6301266f7","tags":[{"product":null,"links":null,"id":"adf72f47-7f61-4239-8392-b9bcc127fa80","name":"\u65B0\u589E","color":"green","productId":"0995490e-43fc-4d6e-bc8d-8e66f38b0c63"}]},{"id":"2426c71d-8332-4cbd-a436-1ec4f8666464","tags":[{"product":null,"links":null,"id":"adf72f47-7f61-4239-8392-b9bcc127fa80","name":"\u65B0\u589E","color":"green","productId":"0995490e-43fc-4d6e-bc8d-8e66f38b0c63"}]},{"id":"2ce7b6b0-78aa-4e4b-bf8a-e4ba2f988298","tags":[{"product":null,"links":null,"id":"adf72f47-7f61-4239-8392-b9bcc127fa80","name":"\u65B0\u589E","color":"green","productId":"0995490e-43fc-4d6e-bc8d-8e66f38b0c63"}]},{"id":"4706db46-0811-4652-8f59-1e0a1da84758","tags":[{"product":null,"links":null,"id":"adf72f47-7f61-4239-8392-b9bcc127fa80","name":"\u65B0\u589E","color":"green","productId":"0995490e-43fc-4d6e-bc8d-8e66f38b0c63"}]},{"id":"8f1271bb-2cd9-4f39-9897-c15b239ee7ab","tags":[{"product":null,"links":null,"id":"adf72f47-7f61-4239-8392-b9bcc127fa80","name":"\u65B0\u589E","color":"green","productId":"0995490e-43fc-4d6e-bc8d-8e66f38b0c63"}]},{"id":"677e13a7-6f3e-449f-986c-2c3a26f8d54f","tags":[{"product":null,"links":null,"id":"adf72f47-7f61-4239-8392-b9bcc127fa80","name":"\u65B0\u589E","color":"green","productId":"0995490e-43fc-4d6e-bc8d-8e66f38b0c63"}]},{"id":"5e40f6dc-caec-49d7-a1d0-be65f06815ba","tags":[{"product":null,"links":null,"id":"adf72f47-7f61-4239-8392-b9bcc127fa80","name":"\u65B0\u589E","color":"green","productId":"0995490e-43fc-4d6e-bc8d-8e66f38b0c63"}]},{"id":"2457f0e0-9e71-4860-a87d-065e0fb84f84","tags":[{"product":null,"links":null,"id":"adf72f47-7f61-4239-8392-b9bcc127fa80","name":"\u65B0\u589E","color":"green","productId":"0995490e-43fc-4d6e-bc8d-8e66f38b0c63"}]},{"id":"d5c67fd0-1145-482c-9113-97b492c44c18","tags":[{"product":null,"links":null,"id":"adf72f47-7f61-4239-8392-b9bcc127fa80","name":"\u65B0\u589E","color":"green","productId":"0995490e-43fc-4d6e-bc8d-8e66f38b0c63"}]},{"id":"a609a8fa-ab91-4c1d-a1c3-d209d0463303","tags":[{"product":null,"links":null,"id":"adf72f47-7f61-4239-8392-b9bcc127fa80","name":"\u65B0\u589E","color":"green","productId":"0995490e-43fc-4d6e-bc8d-8e66f38b0c63"}]},{"id":"b4a9eb15-94e5-48df-b218-a24138f0cf9c","tags":[{"product":null,"links":null,"id":"adf72f47-7f61-4239-8392-b9bcc127fa80","name":"\u65B0\u589E","color":"green","productId":"0995490e-43fc-4d6e-bc8d-8e66f38b0c63"}]}]
        
(Showing Draft Content)

了解表达式

功能概述

为了便于理解,我们先用两个简单的示例来感受一下什么是表达式。

例1: 当我们在文本框中输入“{1+2}”时,实际预览显示的是运算结果“3”。

image2020-10-12_16-54-21.png

例2: 当我们在文本框中绑定字段时,如绑定“ 类别名称 ”,在文本框的属性设置面板中可以看出它的实际数据是一个自动生成的表达式“ {Count(类别名称)} ”。预览时,显示的是运算后的结果“1000”。

image2020-10-12_16-57-15.png


另外,数据过滤章节中的用户/组织上下文信息,表格组件中的表格行号以及报表外观中的条件格式化都是用表达式达到预期效果的。

通过这些示例,我们可以看出表达式都是以等号“=”开头且预览时会进行运算处理,它既可以用于报表内容显示也可以用于报表元素行为的控制。

常用应用场景

由于表达式的构成元素非常丰富,使得它的应用场景更是广泛灵活。其中最常用的应用场景包含以下几种: