console 命令行工具 X clear

console

var arr = [1, 2, 3, [4, 3, 2, 6, [7, 9, 2, 4, 6]]]

//多维数组转成一维数组

//es6 flat方法
const res1 = arr.flat(Infinity)

// JSON.stringify方式
const res2 = JSON.stringify(arr).replace(/\[|\]/g, '').split(',')

// JSON.stringify 改进
const res3 = JSON.parse('[' + JSON.stringify(arr).replace(/\[|\]/g, '') + ']')

// 递归的方式
const res4 = []

const fun = arr => {
    for (var i = 0; i < arr.length; i++) {
        if (Array.isArray(arr[i])) {
            fun(arr[i])
        } else {
            res4.push(arr[i])
        }
    }

}

fun(arr)

// console.log(res4)

// reduce


const funs = arr => {
   return arr.reduce((pre, cur) => {
        return pre.concat(Array.isArray(cur) ? funs(cur) : cur)
    }, [])
}

console.log(funs(arr))

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	<title>数组扁平化</title>
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<body>
	
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