在学习 Javascript 的解构赋值语法时，遇到了一个想不明白的语法

代码如下

var metadata = { title: "Scratchpad", translations: [ { locale: "de", localization_tags: [ ], last_edit: "2014-04-14T08:43:37", url: "/de/docs/Tools/Scratchpad", title: "Javascript-Umgebung" }, { locale: "fg", localization_tags: [ ], last_edit: "2015-04-14T08:43:37", url: "/de/docs/Tools/Scratch", title: "Javascript" } ], url: "/en-US/docs/Tools/Scratchpad" }; var {title: englishTitle, translations: [{title: localeTitle}]} = metadata; console.log(englishTitle); // "Scratchpad" console.log(localeTitle); // "Javascript-Umgebung" 

title: englishTitle 取 metadata 对象中的 title 的值并赋值给变量 englishTitle 这个能看懂

translations: [{title: localeTitle}] 这里 title: localeTitle 这个能理解 translations: [{}] 这个语法想不通是啥意思了