提取数组中对象

例如fileDate = [
            {deleteValue: 0, downloadValue: 0},
            {deleteValue: 1, downloadValue: 1},
            {deleteValue: 2, downloadValue: 0},
]
　　数组中的多个对象存在共同的属性deleteValue和downloadValue，我们在项目中有时候需要提取出deleteValue，
将所有的deleteValue属性值收集起来做处理，我们可以使用两次循环来完成它

let newObj = {}
        const fileDate = [
            {deleteValue: 0, downloadValue: 0},
            {deleteValue: 1, downloadValue: 1},
            {deleteValue: 2, downloadValue: 0},
        ]
        const keys = Object.keys(fileDate[0])
        keys.forEach((item,index) => {
            console.log(keys[index]);
            const value = keys[index]
            const arr = fileDate.map(item => item[value])
            newObj[value] = arr
        })
        console.log('newObj',newObj);
　　　　//newObj: {deleteValue: [0, 1, 2]， downloadValue: [0, 1, 0]  }