Questions about Property traversal

Seeing this thing today is not so hard for a novice, just know hasOwnProperty () This function can traverse the properties inside the constructor.

The topics are described as follows:

Find out which object obj is not on the prototype chain (note that there is also a space after the colon of the test example)
1, return array, formatted as Key:value
2. The result array does not require order

Solution:

function iterate (obj) {
var arr=[];
for (var i in obj) {
if (Obj.hasownproperty (i)) {
Arr.push ((i.tostring () + ":" +obj[i].tostring ()));
}
}
return arr;
}

I is key,obj[i] is value.

Have done a lot of problems. This is a milestone, it's easy to finish.

Questions about Property traversal