object方法获取对象的属性值

  <script>
        /*
        object.keys()可以获取对象所有的属性
        object.values()可以获取对象所有属性的值
        */
        var obj = {
            name:"李四",
            age:39
        }
        var keys = Object.keys(obj)
        var values = Object.values(obj)
        console.log(obj)
        console.log(values)
    </script>

  <script>
          var arr ={
            A:[{city:"武汉"},{city:"广州"}],
            B:[{city:"深圳"},{city:"广州"}],
            C:[{city:"上海"},{city:"武汉"}],
        }
        var values = Object.values(arr);
        values.forEach(item=>{
            console.log(item)
            item.forEach(city=>{
                console.log(city)
            })
        })
    </script>