vueelement中的table动态渲染实现（动态表头）

props: {
 tableData: { // 父组件传递过来的表格数据
    type: Array,
    default: []
  },
  tableLabel: { // 父组件传递过来的表头数据
    type: Array,
    default: () => {
      return []
    }
  }
}

data() {
 return {
 // 子组件的表格数据
 tableData: [
  {id: 1, date: '2018-07-24', sales: 23.34, sale: 137597.76, const: 102203.71, profit: 35394.05},
  {id: 2, date: '2018-07-24', sales: 23.34, sale: 137597.76, const: 102203.71, profit: 35394.05},
  {id: 3, date: '2018-07-24', sales: 23.34, sale: 137597.76, const: 102203.71, profit: 35394.05},
  {id: 4, date: '2018-07-24', sales: 23.34, sale: 137597.76, const: 102203.71, profit: 35394.05},
  {id: 5, date: '2018-07-24', sales: 23.34, sale: 137597.76, const: 102203.71, profit: 35394.05},
  {id: 6, date: '2018-07-24', sales: 23.34, sale: 137597.76, const: 102203.71, profit: 35394.05},
  {id: 7, date: '2018-07-24', sales: 23.34, sale: 137597.76, const: 102203.71, profit: 35394.05},
  {id: 8, date: '2018-07-24', sales: 23.34, sale: 137597.76, const: 102203.71, profit: 35394.05},
  {id: 9, date: '2018-07-24', sales: 23.34, sale: 137597.76, const: 102203.71, profit: 35394.05},
  {id: 10, date: '2018-07-24', sales: 23.34, sale: 137597.76, const: 102203.71, profit: 35394.05},
  {id: 11, date: '2018-07-24', sales: 23.34, sale: 137597.76, const: 102203.71, profit: 35394.05},
  {id: 12, date: '2018-07-24', sales: 23.34, sale: 137597.76, const: 102203.71, profit: 35394.05}
 ],
 // 子组件的表头数据
 tableLabel: [
      {label: '', width: '40', prop: 'id'},
      {label: '日期', width: '', prop: 'date'},
      {label: '销售量', width: '', prop: 'sales'},
      {label: '销售额', width: '', prop: 'sale'},
      {label: '成本', width: '', prop: 'const'},
      {label: '利润', width: '', prop: 'profit'}
    ]
 }
}