fix:链表理论基础.md
typescript中,null只能赋值给any和null类型变量。这里需要采用联合类型声明。
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@ -186,7 +186,7 @@ TypeScript:
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```typescript
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class ListNode {
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public val: number;
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public next: ListNode = null;
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public next: ListNode|null = null;
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constructor(value: number) {
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this.val = value;
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this.next = null;
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