js 获取当前值在数组的下标

js 获取当前值在数组的下标

const arr = [1, 2, 3, 4, 6, 22, 55, 33, 66, 44];
const getIndex = ((arr,item)=>{
        for(var i in arr){
            if(arr[i] == item){
              return i;
            };
        };
    });
getIndex(arr,55);