[英]Getting object property
我是TypeScript的新手。
如何解決這個問題:
layout[self._swapEntries ? '_rows' : 'rows'].slice(0, layout.numRowsToDraw);
錯誤:
error TS7017: Index signature of object type implicitly has an 'any' type.
另一個問題:
let entries = rows.selectAll("g." + Legend.LEGEND_ENTRY_CLASS).data((d) => d);
錯誤2:
error TS2345: Argument of type '(d: {}) => {}' is not assignable to parameter of type '(datum: {}, index: number, outerIndex: number) => {}[]'.
Type '{}' is not assignable to type '{}[]'.
Property 'length' is missing in type '{}'.
您可以執行以下兩項操作之一:
layout
對象實現強類型定義: interface ILayout {
[index: string]: string[] | number, // And any other types which your object returns
numRowsToDraw: number
}
var layout = {
numRowsToDraw: 10
};
然后將訪問的屬性顯式轉換為數組:
(<string[]>layout[self._swapEntries ? '_rows' : 'rows']).slice(0, layout.numRowsToDraw);
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