typescript 类型 [] 中缺少 JavaScript 类型脚本属性 0
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JavaScript type script Property 0 is missing in type []
提问by stevenpcurtis
I want to have an array of an object as follows.
我想要一个对象数组，如下所示。
However typescript throws up an error Property 0 is missing in type []
然而，打字稿抛出了一个错误属性 0 在类型 [] 中丢失
let organisations: [{name: string, collapsed: boolean}] = [];
回答by Titian Cernicova-Dragomir
What you are defining is a tuple type(an array with a fixed number of elements and heterogeneous types). Since tuples have a fixed number of elements the compiler checks the number of elements on assignment.
您定义的是元组类型（具有固定数量元素和异构类型的数组）。由于元组具有固定数量的元素，编译器会在赋值时检查元素的数量。
To define an array the []must come after the element type
要定义数组，[]必须在元素类型之后
let organisations: {name: string, collapsed: boolean}[] = [];
Or equivalently we can use Array<T>
或者等效地我们可以使用 Array<T>
let organisations: Array<{name: string, collapsed: boolean}> = [];
回答by Praveen Poonia
You can define tuples types like -
您可以定义元组类型，如 -
type organisationsType = {name: string, collapsed: boolean};
let organisations: organisationsType[];
Remember array the []must come after the element type, like organisationsTypein above example.
记住数组[]必须在元素类型之后，就像organisationsType上面的例子一样。
