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@@ -223,7 +223,7 @@ export class TextbookComponent implements OnInit {
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fromatFiled(list: Array<Parse.Object>, filed: string): string {
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let arr: Array<string | null> = [];
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let isDate = false;
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- list.forEach((item: Parse.Object) => {
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+ list?.forEach((item: Parse.Object) => {
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// arr.add(item.get(filed))
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if (
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isDate ||
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