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纠正 0047.全排列II JS、TS 版本代码

JS 和 TS 里面数组深拷贝一般采用 ES6 扩展运算符 ... ,或者 Array.from() 方法,而不会采用实例方法 slice. slice方法用于数组分割等操作,请注意代码书写规范!

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Original file line number	Diff line number	Diff line change
`@@ -268,7 +268,7 @@ var permuteUnique = function (nums) {`
`268`	`268`
`269`	`269`	`function backtracing( used) {`
`270`	`270`	`if (path.length === nums.length) {`
`271`		`- result.push(path.slice())`
	`271`	`+ result.push([...path])`
`272`	`272`	`return`
`273`	`273`	`}`
`274`	`274`	`for (let i = 0; i < nums.length; i++) {`
`@@ -303,7 +303,7 @@ function permuteUnique(nums: number[]): number[][] {`
`303`	`303`	`return resArr;`
`304`	`304`	`function backTracking(nums: number[], route: number[]): void {`
`305`	`305`	`if (route.length === nums.length) {`
`306`		`- resArr.push(route.slice());`
	`306`	`+ resArr.push([...route]);`
`307`	`307`	`return;`
`308`	`308`	`}`
`309`	`309`	`for (let i = 0, length = nums.length; i < length; i++) {`

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