为什么我的钥匙没有被推入阵列

Question

var arr = [{
   key: "key1", value: "z"
}, {
   key: "key2", value: "u"
}, {
   ...
}];

var sorted = arr.sort(function (a, b) {
    return a.key === b.key ? 0
        : a.key < b.key ? -1 : 1;
});

sorted.unshift({key:"Unknown", value:"0"});

var StateArr = [];
 for(i=0;i<sorted.length;i++){
     StateArr.push(sorted[i].key);
}

alert("ARR" +StateArr);

Now when i alert my sorted, i don't get any response. Why is my key not getting pushed inside the array.

Answer 1

You code is working fine (and "as expected" for me).

What do you receive and what are you expect?