必选参数构造配置

Less than 1 minute

必选参数构造配置

如果组件的接口定义中包含必选构造参数,则在组件后面的“()”中必须配置参数。参数可以使用常量进行赋值。

例如:

Image组件的必选参数src

Image('http://xyz/a.jpg')
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Text组件的必选参数content

Text('123')
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变量或表达式也可以用于参数赋值,其中表达式返回的结果类型必须满足参数类型要求。

传递变量或表达式来构造ImageText组件的参数示例如下:

// imagePath, where imageUrl is a private data variable defined in the component.
Image(this.imagePath)
Image('http://' + this.imageUrl)
// count is a private data variable defined in the component.
// (``) and (${}) are the template character string features supported by the TS language and comply with the
// features of the corresponding language. This specification is not limited.
Text(`count: ${this.count}`)
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