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更正 0019 删除链表中倒数第N个节点 JavaScript 代码

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Original file line number	Diff line number	Diff line change
`@@ -173,8 +173,7 @@ var removeNthFromEnd = function(head, n) {`
`173`	`173`	`let ret = new ListNode(0, head),`
`174`	`174`	`slow = fast = ret;`
`175`	`175`	`while(n--) fast = fast.next;`
`176`		`- if(!fast) return ret.next;`
`177`		`- while (fast.next) {`
	`176`	`+ while (fast.next !== null) {`
`178`	`177`	`fast = fast.next;`
`179`	`178`	`slow = slow.next`
`180`	`179`	`};`

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