多维数组转一维数组

<script type="text/javascript">
//方法一
var arr = [1,[2,3,[4,5,6],7]];

var arr1 =arr.join(",").split(",");

//注 ：字符串数组 如果想转数值数组

arra1=[];

for（var j=1;j<arr1.length;j++）{

arra1.push(Number(arr1[j]))

}

console.log(arr1);

console.log(arra1);

//方法二
var arr = [1,[2,3,[4,5,6],7]];
var arr2 =arr.toString().split(",");
console.log(arr2);
//方法三
var arr = [1,[2,3,[4,5,6],7]];
var arr3 =[];
function foo(arr){
for(var i=0;i<arr.length;i++){
if(Array.isArray((arr[i]))){
foo(arr[i]);
}else{
arr3.push(arr[i]);
}
       }
}
foo(arr);
console.log(arr3);
</script>