polymer - Polymer 中的模板数据绑定(bind)中的 {{}} 和 [[]] 有什么区别？

Question

我有时会遇到{{}}语法，有时 [[]]在 模板数据绑定(bind) .我很确定[[]]用法，它是指组件中的属性，但是{{}}做？

Answer 1

来自 https://www.polymer-project.org/1.0/docs/devguide/data-binding

Binding annotation Text surrounded by double curly bracket ({{ }}) or double square bracket ([[ ]]) delimiters. Identifies the host data being bound. Compound binding A string literal containing one or more binding annotations.

Whether data flow goes down from host to target, up from target to host, or both ways is controlled by the type of binding annotation and the configuration of the target property.

• Double-curly brackets (}) support both upward and downward data flow.

• Double square brackets ([[ ]]) are one-way, and support only only downward data flow.