详细解读数组遍历

var arr=['val-a','val-b','val-c'];
        var obj={
            aa:'对象a',
            bb:'object_b',
            cc:function(){console.log('打印函数值')},
            dd:['数组1','数组2']
        }
        for(var i=0;i';
                $('#chart').append(html);
            }
            html +='
'+i +'添加数组打印值：' + arr[i]+'
'+(i+1)+'
';
            $('#chart').append(html);
            
        }
        console.log(obj.dd[1]);
        console.log(Object.keys(obj));
        console.log(Object.keys(arr));
        //js原生for循环遍历数组
        for(var i=0;i