将字符串转换成数组

var arr=[{"key":"庄,8,3,5"},{"key":"闲,7,7,7"},{"key":"庄,6,3,8"},{"key":"闲,1,2,4"},{"key":"庄,5,5,5"},{"key":"闲,9,9,9"}];

for(i in arr) {
    var val = arr[i]['key'].split(',');
    console.log(val)
}